Kawasaki engine surges at full throttle

Fuel system problems or vacuum leaks through the air intake manifold are typical causes of lawn mower surges. Here's a rundown of the specific issues causing small engines to quickly cycle between idle speed and full throttle: Contaminated gasoline. Old gas or gasoline contaminated with water can cause engine surging. Clogged fuel tank cap vent.

Kawasaki engine surges at full throttle. How to repair an engine carburetor that surges, hunts, pulses or waffles. In this video, we'll show you how to fix a surging engine on a lawn mower, pressur...

2. Engine Misfires or Backfires. A common challenge many have with the Kawasaki Bayou 300 is engine misfiring. There are four possible causes for this malady: An improperly timed fuel pump. A poorly tuned carburetor. Inaccurate valve timing. Unusually low idle screw setting.

New Member. Sep 17, 2015. #1. 1991 G2A boggs down and surges at half to full throttle. Fuel pump pumps gas [have had 2 different ones on] cleaned carb. [have had 2 different ones on] new spark plug and air filter. Runs fine up to half throttle or so then no more power.Take a small pair of vice grips and clamp down and turn the studs but just loosen them. Don't try to back them out completely with the vice grips. Snug but don't tighten the two bolts back on the carburetor. Then put the nuts on one stud and tighten the two nuts together.The sputtering was due to the carbs being extremly dirty. The fixed the jetting and dynoed it. With the mods that I have its 39.6 hp (all internally stock motor). I rode it and could immediately tell there was a difference. Im not sure what jet sizes they used.The throttle lever and cable seem to work fine when the engine is off: full throw on the lever and full movement where the cable connects to the throttle (which I assume is inside the injector pump). But when the engine is running, a tiny movement of the throttle lever - less than a half inch either up or down - can cause big movement in RPMs.Answered in 4 minutes by: Technician: Ranwell1. As engines sit or get older, fuel that is left in the carburetor can turn to gum and varnish and cause this and other problems. Also, any gasoline that was left in a gas can for a period of more than 30 days must be discarded because it also has begun to turn to varnish.2 posts · Joined 2017. #1 · Nov 12, 2017. I recently purchased a used 2009 4010. It was idling too low and cutting off when I bought it. Carried it to a dealer and they adjusted Throttle position sensors. After got back home and rode about 30 minutes, it started idling too high to change gears. Every now and then, it idles correctly.

Sand mud and water can make its way into the tank from three locations. One: The fuel tank vent. This has been covered extensively on how to mod it. I have done this to mine and I suggest you do it to yours immediatley if not already done. Two: The filler cap. Three: The o-ring and metal retaining ring holding the pump in.surging FR600V Kawasaki. I'd start with the cheapest thing first, replace the spark plugs. I had a ngk go bad at 50 hrs, it caused surging at partial throttle. Intermittent problems can be difficult to sort out. You might look for intake leaks.Hello All, I've got a Kohler 26hp, 747cc, 7000 series, KT745, V-twin on a Husqvarna zero-turn. It has a manual choke (cable type). It has slowly started running rough. At all throttle speeds and when warmed up, the engine rpms surge up and down, and at full throttle it pops through the muffler...Surging Engine. OK, we have a liquid cooled 27 HP Kawasaki engine model number FD750D-S04. It has a very bad surging problem from half throttle and above as long as it is not under a load. Once the blades are engaged or if you drive up a hill it smooths out and runs great. Another thing is it backfires and sputters when we take it from full ...The problem showed itself at first like a slight "miss" occasionally when pulling a load, and eventually, over a couple months, it led to "surging" at idle and complete failure while cutting 5" high grass after only a couple of feet. The sputtering seemed to only occur after the engine warmed up (about an hour of cutting) at first but over the ...Kawasaki fh680v surging. i am struggling to figure out this problem. Basically the engine surges or hunts from idle through full throttle. I researched and done all the things that I've seen suggested. 3 different carbs. Current one is brand new. Still surges. Fuel pump works. Fuel lines clear.The resulting loss of power will increase the demand for ignition. The Electronic Control Module will overcompensate, leading to engine surging. The fix: This is a problem you can troubleshoot and fix in your garage. Check and replace the distributor cap, rotor, ignition wires, and spark plugs.

The throttle lever and cable seem to work fine when the engine is off: full throw on the lever and full movement where the cable connects to the throttle (which I assume is inside the injector pump). But when the engine is running, a tiny movement of the throttle lever - less than a half inch either up or down - can cause big movement in RPMs.Apr 22, 2012 ... I have the same issue with my X300. It is worst at idle, but is somewhat present at full throttle. It usually gets better as it warms up. The ...Same thing on my 02 auto. Started about 6 months ago, at about 165,000 mi. You can hear and feel the surge. Under steady throttle, it happens when the engine requests just a little more power. It is like it overcompensates. Most noticable at 45-55mph. I am quite sure the trans is NOT unlocking or slipping.Have an 06 3010 Trans. When driving at full throttle engine rpms cut dramatically, then after a few seconds surge back up to full throttle, it does this after running about 300 yards. I put it in the garage and go full throttle and it does not seems to pull the rpms all the way up.Kawasaki FH430V surging/loping at idle solved! In an attempt to give back to all of you for all the info I have gleaned over the years I want to share some success with this particular motor I had this evening. The motor is a Vert. 15 hp. I bought it used and ever since I had it has always had the dreaded surging at idle or slightly above.

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Changing the filter to an after market filter will lean the motor out which will cause a "surge" at full throttle. You will need to possible jet the motor richer to compensate for the leaner filter design. Third: Try rolling out og the throttle from full throttle by about 1/8th and see if the engine RPM's increase and the surge goes away, if so ...Jan 25, 2021 / Kohler 7000 KT725 won't idle, always full throttle. #2. If you done the static adjustment correctly then yes the governor has failed. For guidance only. From service manual. Initial Adjustment Procedure. Make this adjustment whenever governor arm is loosened or removed from cross shaft. Adjust as follows: 1.1 post · Joined 2017. #1 · Jul 14, 2017. I've had a rough idle with my mule for a couple weeks now. Runs well under load but dies, surges and idles horrible. I've cleaned the throttle body, ruled out bad gas, changed spark plugs, checked the fuel pump and filters. The only thing I've been able to determine is it's running very rich.Unintended acceleration may mean that a car’s throttle is stuck in an open position or that there is a problem with the gas pedal. Mistakes also lead drivers to believe their cars ...If I hold the brakes and slip the clutch, the RPM's drop to idle and will stay there (1000-1200). It is very repeatable when warm. If restarted while warm it will idle normally and then when throttle is rolled off stay at the higher RPM. Choke is off. I've checked the cables, both the throttle and choke, and they both seem to work as they ...May 30, 2021 · Move the throttle to the FAST position. Pull the PTO switch up/out into the ENGAGED (ON) position. NOTE: When operating the tractor be certain that the throttle is always in the FAST position. Operating with the throttle at less than full throttle may lead to premature battery wear and a poor quality cut.

185 posts · Joined 2001. #1 · Jul 5, 2001. i have a hustler z and love it so far! one problem i have is the kawasaki 23hp engine started surging at about 40 hours. The local dealer cleaned and eventually replaced the carb. problem was fixed, or so I thought. Now I have to engauge blades at full throttle or the engine will die.O.S. Engines Support - Pumped OS FS-91 surges at full throttle - I have a pumped OS FS-91 which is running erratically at full throttle - it surges. It will run well for awhile leaving a visible smoke trail but then it sags and the trail disappears. This happens erratically. Sometimes I can get nearly a fuull flightThe mule pro fxt ranch edition is back in the shop. Same problem, no resolution. Been out of commission for 7 weeks this Saturday. I have taken it to two dealers (original dealer first) and neither can find the problem. I'm not getting any assistance from Kawasaki at this point, even though it's still under warranty.FIX idle/running problems with Briggs & Stratton most years, Here's Exact ORing KIT Briggs Carb repair, Simple Dual fix: Exact ORings https://ebay.us/uzi3cg ...How to repair an engine carburetor that surges, hunts, pulses or waffles. In this video, we'll show you how to fix a surging engine on a lawn mower, pressur...Mar 6, 2023 ... A clogged Pilot jet will cause and engine to surge like crazy when it's running full throttle unloaded. Once it's put under a load, the surging ...Yea its real easy. Everything just unscrews and screws back in. The throttle needle will be the hardest thing. When you take something out use Carb cleaner to clean those holes good. 1998 bayou 220. K&N power kit. Back wheels spaced 2.5 inches. Front wheels spaced 2 inches. 22x11.5 mud witches on back.GX345 Surging Engine Problems. I have a JD 2005 GX345 garden tractor with a 20hp liquid cooled Kawasaki engine. I am having trouble with the engine surging after it warms up very badly. I have done the following things to rectify the problem with no success. Couple of hints: When I run the PTO (blades) it runs like a top.Here's aka Yamadog's photo, with a T25 Torx tool on the Main Throttle Sensor screw. Start by rotating your Main Throttle Sensor (lower) counterclockwise by a very small amount (about 0.5mm). Before loosening Torx screw, look at how the sensor's green reference mark ligns up on the front, with your head against your front left turn signal.Kawasaki FH480V Surging at high RPM. ... I am having a problem on a Scag with a FH480v where it is surging slowly at full throttle, idle speed is smooth. It's not a fast surge but it is consistent, probably a full second to a second and a half between the RPMs fluctuating. ... but the engine will completely die if I apply full choke at high RPM ...

This can cause the engine's RPMs to surge up and down. Start by removing the air filter housing and filter, then loosen the carburetor bolts. Pinch the fuel line to prevent fuel from spilling everywhere. Remove the fuel line and disconnect any linkages on the carburetor. Check the condition of the gasket; look for tears, rips, or any ...

The engine when not under load runs on the idle circuit of the carb, but if that system is partially or fully clogged, the engine can't get enough fuel to run at that rpm, the rpm's start dropping and the governor spring opens the throttle which causes the engine to get fuel from the high speed jet.Jun 17, 2017 / Runs rough at high rpm. #4. Hi I am Rick. Ok my mower is a Craftsman 30" deck Model # 917.280330 sn# 030309A002530 Engine Briggs and Stratton Model # 31C707 Type # 0603B1 Code # 081205ZE. My self I am a certified aircraft mechanic, I restore old cars for a hobby, I started keeping my lawn mowers running when I was 10 years old ...T. tiredpharm2 Discussion starter. 7 posts · Joined 2006. #1 · May 21, 2006. I have a CountryClipper Zero-turning radius mower with a Kawasaki 23 hp engine FH680V. I have had it a little over 2 years and it has less than 100 hours, which for a commercial grade mower isn't much. When it is running right, it cuts and spits out the thick grass ...Unintended acceleration may mean that a car’s throttle is stuck in an open position or that there is a problem with the gas pedal. Mistakes also lead drivers to believe their cars ...Throttle kills the engine. I have a 2001 Ninja 250 8k miles that I have had for 3 years or so now and went to get it running today for the first time in about 5 months, I drained the gas tank, put in a gallon of fresh gas, charged the battery, opened the choke and it started up after a few tries. I let it run for 5-10 min then went to try to ...Hi Guys, I have a 61" Scag Turf Tiger that has the 27hp Kawasaki Engine (FD750D). The engine has a surge where the RPM will go up and down at idle. The throttle position doesn't seem to matter. It runs a bit smoother at full throttle but still surges some. When surging if I look at the side of the carburetor I can see the throttle plate fluctuate.First thing I would do is get a Tach on it and run it where it is surging. Grab the linkage with your hand and hold it at a steady RPM where it normally surges. If the surging stops and it runs fine, the problem is in the governor. If the engine dies or wont run steady while holding the throttle you have a fuel problem.1,851. May 28, 2015 / Two Kawasaki Engines that Dip and Surge at Idle. #3. Get some Sea Foam fuel additive and give a strong dose to each machines fuel tank. The RPM your machines are running at seems high for low idle. As a carb makes the transition from the low speed system to both the high and low speed system, engines tend to vary RPM.

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When it starts, it begins to surge. RPM goes up and down. Governor rotates up and down. This surging happened no matter if at idle or at full throttle. Here are the things I have replaced and checked: I replaced the carburetor...I verified the choke spring is set properly also and governor to throttle and throttle cable...with correct spring ...I have a 15hp Kawasaki on a 48 Lesco and the engine surges. I did all the routine things I could think of. Changed oil, air filter, emptied carb bowl, cleaned fins, …Sep 30, 2003 · Short of choking the machine in tall grass or an old machine with worn block, surging is symptomatic of improper and varying ratios of the fuel/air mixtures. The four most common I have found are: The governor spring is broken or in the incorrect adjustment hole. The small spring that takes the play out of the throttle linkage is either broken ... 1 post · Joined 2017. #1 · Jul 14, 2017. I've had a rough idle with my mule for a couple weeks now. Runs well under load but dies, surges and idles horrible. I've cleaned the throttle body, ruled out bad gas, changed spark plugs, checked the fuel pump and filters. The only thing I've been able to determine is it's running very rich.15 posts · Joined 2018. #1 · Oct 30, 2018. I have a Dixie Chopper Magnum 2250 with a Kawasaki Fs651v engine. It is surging and does not idle up above 3550 rpm with the blades off. The rpm goes up and down 100 to 150 rpm just idling with blades off. It idles rough when blades are on also. I have put a new fuel filter, plugs, and air filter on it.Surging Engine. OK, we have a liquid cooled 27 HP Kawasaki engine model number FD750D-S04. It has a very bad surging problem from half throttle and above as long as it is not under a load. Once the blades are engaged or if you drive up a hill it smooths out and runs great. Another thing is it backfires and sputters when we take it from full ...Locate the limiting mechanism by lifting up the cargo bay at the back, finding the black metal cover which is riveted over the governor (has the throttle rod going underneath it from the carburettor), drilling out the three rivets and removing the metal cover. Find the parts that resemble this:The engine started surging yesterday at both low throttle and high throttle. I changed out the fuel filter, no difference. ... '04 Ferris 52" Kawasaki 23 hp w/ Trac Vac '98 Exmark Metro 36" Kawasaki 14 hp ... a common problem that causes engine surging is dirt ingested into air jets. these are usually found in the carb throat behind choke plate ...At part throttle I had identical problems with the engine surging. Based on your success, I pulled mine apart today and found the exact same issue. As I pulled the fuel pump out of the tank, the hose disconnected from the pump. The hose was in very poor condition. I replaced the hose and the engine runs great. No surging at all. ….

Ariens snowblower surges at full throttle. I have an Ariens 524 snoblower with a Tecumseh 5hp motor. When I got the snowblower it wouldn't run without the choke on. I cleaned the carb and it will now start and idle fine. The issue is the engine surges at full throttle. The carb does not have an adjustable jet screw.Owners Manual. Find technical downloads such as specification sheets, troubleshooting guides, service data, owners manuals and brochures for your fd620d engine.kbeechler. 11 posts · Joined 2022. #9 · Nov 8, 2022. I'm reading about the Kawasaki FJ180V surge, I have a brand new machine, straight out the box, it too surges during load, it idles beautifully.. it will really surge at full throttle, but if I back it off to about 3/4, it surges very little..The engine started surging yesterday at both low throttle and high throttle. I changed out the fuel filter, no difference. ... '04 Ferris 52" Kawasaki 23 hp w/ Trac Vac '98 Exmark Metro 36" Kawasaki 14 hp ... a common problem that causes engine surging is dirt ingested into air jets. these are usually found in the carb throat behind choke plate ...Kawasaki FD750D Surging/Fuel problems. Hello everyone, new member here. I have an old scag turf tiger that had a carb on it and when it came time for a new motor I bought the fuel injected version of the same engine and retro fitted it. which was as simple as a new wiring harness, Now I cant get it to run right and my mech seems to be simply ...Apr 14, 2021 · 14,778. Apr 23, 2021 / Mower runs at low RPM at full throttle. #7. Could be that the throttle cable is not adjusted properly. Try this, move throttle control to full speed, and then loosen the screw holding the cable in place. With the cable loose push it forward as far as possible and then tighten the screw. All purpose and heavy duty, the FJ180V is built to be compact and lightweight—all while offering you the power you need to accommodate a range of applications. From walk-behind mowers and golf-course equipment to construction and agricultural machinery, this overhead valve Kawasaki engine features a dual-element air cleaner, low-tone muffler with guard, cast-iron cylinder liners, and more ...Engine surge is a sign of inefficiency in the engine's operation, causing stress on various components. It can wear down parts like the throttle body, fuel pump, and spark plugs over time. In more severe cases, persistent engine surges can lead to more significant engine damage requiring extensive and costly repairs. Kawasaki engine surges at full throttle, Hi Guys, I have a 61" Scag Turf Tiger that has the 27hp Kawasaki Engine (FD750D). The engine has a surge where the RPM will go up and down at idle. The throttle position doesn't seem to matter. It runs a bit smoother at full throttle but still surges some. When surging if I look at the side of the carburetor I can see the throttle plate fluctuate., When a Kawasaki engine revving fluctuates, this is known as “surging” and it is a direct result of inconsistent volumes of fuel and air being delivered to the engine’s combustion chamber. The problem will lie with the fuel filter, injectors, lines, or the carburetor. Remember, combustion requires both fuel and oxygen., When it comes to purchasing remanufactured Kawasaki engines, one of the key factors that buyers consider is the warranty. A warranty provides peace of mind and ensures that custome..., A hurricane's storm surge has the potential to catch people off guard. A hurricane’s storm surge has the deadly potential to catch people off guard. It can occur far from the storm..., Sep 30, 2003 · Short of choking the machine in tall grass or an old machine with worn block, surging is symptomatic of improper and varying ratios of the fuel/air mixtures. The four most common I have found are: The governor spring is broken or in the incorrect adjustment hole. The small spring that takes the play out of the throttle linkage is either broken ... , Kawasaki FX730V engines may leak oil around the camshaft bearing. This is caused by a poor seal between the cam and its bearing race. The problem is diagnosed by checking for oil leaks in the engine. If there are no leaks, the engine should be replaced because it will leak oil after some time. The problem can be corrected by installing a new ..., The labor costs will be anywhere between $150 and $300, depending on the hourly rate of the mechanics and the amount of work it takes to access the throttle position sensor. In total, you can expect to pay between $250 and $400 for a throttle position sensor replacement. Since replacing the TPS is fairly easy in most cases (depending on its ..., 11 posts · Joined 2007. #1 · Jun 13, 2010. Please help!! idle problems Exmark Lazer Z HP Kawasaki, 19HP, FH580V 720 hours- real clean machine, all of a sudden the engine surges at idle, runs rough, stops surging at half throttle and at full power with mowers on it runs fine but sounds rough. I figured air or fuel filter bad, changed both and ..., engine cuts out at full throttle. Jump to Latest Follow ... Pro-Fill tank pre filter, LE wheels, 4500lb Super Winch, Kawasaki Cargo box, custom floor protectors, Boss ATV25B Bluetooth speakers/amp, Kawasaki soft top, Half shield, Kawasaki LED Headlights. _____ Sold:2011 550 Grizzly Steel Blue/Cast Wheels,Moose Hand gaurds,Elka stage 1 shocks ..., Corey King said: 2012 Brute Force 750 surging half throttle. 2012 efi Brute Force 750 4000km. swamp exhaust. power commander 5 (custom map vforce john) Primary Red spring (vforce john) K&N air filter with breather box hood with fine screen filter. Recently by bike when I go above 1/4 throttle it starts to surge., Jun 17, 2017 / Runs rough at high rpm. #4. Hi I am Rick. Ok my mower is a Craftsman 30" deck Model # 917.280330 sn# 030309A002530 Engine Briggs and Stratton Model # 31C707 Type # 0603B1 Code # 081205ZE. My self I am a certified aircraft mechanic, I restore old cars for a hobby, I started keeping my lawn mowers running when I was 10 years old ..., My mower has the 24hp kawasaki EFI 750 engine and when dropped to idle it slowly settles into a never-ending cycle of pulsing the throttle to try to attain the target idle revs. If you bump the gas up, it cuts the fuel back and settles into the same pattern quite quickly., Kawasaki FX801V Surging. I am working on this Zero turn and it is surging. Someone has already screwed around with the governor and I went through following the repair manual to adjust it. It still surges at full rpm and if I give a little choke it does not help. (the customer rebuilt the carb as well) I am thinking that the governor inside the ..., Troubleshooting a throttle/fuel issue on a FH661V Kawasaki engine. Cranking the engine with choke works and I can idle the engine on low. When I apply throttle, the engine appears to be starving of fuel and will shut off within one minute. I can extend that minute by applying more choke but that's obviously not a working solution., 11 posts · Joined 2007. #1 · Jun 13, 2010. Please help!! idle problems Exmark Lazer Z HP Kawasaki, 19HP, FH580V 720 hours- real clean machine, all of a sudden the engine surges at idle, runs rough, stops surging at half throttle and at full power with mowers on it runs fine but sounds rough. I figured air or fuel filter bad, changed both and ..., Do you know How to Protect Your Property from a Storm Surge? Keep reading to learn about storms and How to Protect Your Property from a Storm Surge. Advertisement Long before satel..., Hi all! In today's video, I will be fixing this zero turn mower that surges very badly. I will walk through how to fix it and what to do. I am performing thi..., The top speed of a Kawasaki KLX 110 is 50 mph. The Kawasaki KLX 110 is a compact dirt bike designed for children and beginners. It is lightweight and has a lively engine and comfor..., So if it will only run choked, even when warmed up, it sounds like too much air is getting into the engine., O.S. Engines Support - Pumped OS FS-91 surges at full throttle - I have a pumped OS FS-91 which is running erratically at full throttle - it surges. It will run well for awhile leaving a visible smoke trail but then it sags and the trail disappears. This happens erratically. Sometimes I can get nearly a fuull flight, 2. Posted: Jun 2, 2020. Options. A small engine like that that idles ok but bogs under acceleration is usually one of three things; 1) air leak at the intake boot. A squirt of starter fluid at the boot while running will tell you. If it revs you have a vacuum leak., 4010 Mule surging. I have a 2011 mule 4010 that surges at low RPM. it idles ok at start but if i slowly accelerate it gets really sticky and surges. if I floor it it runs great. I have changed out the injectors and cleaned the fuel pump screen. I suspect the Throttle sensors may be the real issue but I dont have the special connector to test this., I have a 15hp Kawasaki on a 48 Lesco and the engine surges. I did all the routine things I could think of. Changed oil, air filter, emptied carb bowl, cleaned fins, sprayed carb cleaner, fuel filter. A couple of times it stopped surging when bring it to full throttle. Anyone have any Ideas?, Kawasaki 17 horse engine, with 340 hours. Is just... Menu. Forums. Today's Posts New posts Search Members Current visitors New ... have a friend's JD x300 (maybe 3-4 years old??) that surges on all speeds. Kawasaki 17 horse engine, with 340 hours. ... It is worst at idle, but is somewhat present at full throttle. It usually gets better as it ..., blue83ranger Discussion starter. 15 posts · Joined 2005. #1 · Jan 27, 2012. I bought an '89 Bayou 220 a few weeks ago and it has a weird problem i need help figuring out. It starts and idles great and I can give it some throttle but at a certain rpm it just dies, i tried choking it while it dies and it still dies and i tried different ..., A dirty air filter is one of the most common causes behind a leaf blower that is bogging down: the air is enough for the engine to idle, but as soon as you switch to full-throttle, the machine will stall. All we need to do is replace the air filter. To do this, start by opening the air filter cover. Once it is visible, you can have a look at it ..., 136 posts · Joined 2010. #2 · Apr 1, 2011. 1) The Seafoam needs to go into the gas BEFORE the bike sits. It will prevent the build up of gunk in the carbs. The way you did it the old gas sat in the carb bowls depositing the crap, then you put the seafoam in to clean it up. Prvention is better than an attempt at a cure., 13685 posts · Joined 2005. #4 · Mar 30, 2005. Sound like a vacuum leak! This would cause surging I don't know this engine but check to see if the carb has come loose from the intake manifold or if it has a vacuum line check to see if it has came off or rotted. A EZ test is to use starter fluid and spray it between the intake manifold and the ..., Surging Engine. OK, we have a liquid cooled 27 HP Kawasaki engine model number FD750D-S04. It has a very bad surging problem from half throttle and above as long as it is not under a load. Once the blades are engaged or if you drive up a hill it smooths out and runs great. Another thing is it backfires and sputters when we take it from full ..., 1 post · Joined 2017. #1 · Aug 3, 2017. I removed and cleaned the throttle body on my 2010 Silverado LT and now i'm experiencing an engine surge when I come to a stop. The RPMs jump two or three times and the truck jerks before coming to a complete stop. I also have bit of a high idle when I start up, and it hangs around 700 for a couple ..., However, if there are any leaks, the engine can draw in outside air that hasn’t had fuel added to it, leaning out the mixture. Start by tightening all the bolts around the carburetor: these can work loose after being subjected to engine vibration, letting the carburetor separate from the head. If the engine is still surging, inspect the ..., You can try the old school trick of running the engine at full revs and closing the choke until it almost dies. Open the choke and let the engine stabilize. Repeat this process a few times. You might get some good results. If not, the only true way to effect repairs is to disassemble the carb and fully clean it., I have a previous generation eXmark Lazer Z with the 28HP Kawasaki FH770D KAI. Over the last month (I only use it about 1 per week) I've noticed that under a heavy load, such as stopping on a hill with the blades engaged and then starting to go up the hill again, the engine will sputter a little. It seems to be getting a little worse now and …