Kohler engine surging at idle

Hi folks new to the group here. I've got a Kohler sv601 vertical shaft engine that was surging. I did a carburetor cleaning and new plug new coil and now I cannot get it to keep a high idle. I did the adjustment as per the manual for the governor but still once I engage the blades, the RPMs come...

Kohler engine surging at idle. Any change in the engine running will indicate a fuel leak. Badly worn valve can also create a similar problem at low speed but vanishes at higher speeds. M. ... Messages 8. May 29, 2017 / Kawasaki H 721V surging at idle #3 bertsmobile1 said: Surging is usually lack of fuel. Surging at low idle is usually a blocked idle circuit in the carb.

If you replace engine fuel filter, make SURE you refit with properly spcified kohler filter. Drain/clean carb - flush with carb cleaner rattlecan and compressed air. replace any disassembled gaskets - do not re-use. Make sure fuel tank is clean of old fuel and clear of any trash at bottom. Check fuel tank cap for vent OK.

B. B-Man Discussion starter. 18 posts · Joined 2018. #1 · Apr 16, 2018. I have a John deere STX38 with a Kohler command cv14. it was gutless so i followed the service manual and readjusted the throttle then set the RPM to 3600 with my tacho using the speed control bracket. it was sitting at 3000. Now the thing just wants to surge under no ...In this video Shane goes over some steps you can take if your Kohler EFI engine is over fueling on your Brandt auger.Kohler 7000 series surging. ... I have a KT725 engine on this 2014 Z-Force ZTR. About 2 years ago I ran out of fuel while mowing. ... No longer needs choke to not stall while engaging the blades... idles and runs smoothly at high idle w/no load. I hypothesize this was leaking on the carb to intake manifold gasket. Upper red circle on my earlier ...My Troy Bilt riding mower engine was surging while running and this is how I fixed the problem. How to remove and clean a Briggs & Stratton riding lawn mow...Cub Cadet XT1 - Kohler 725 surging. I'm new to this forum, so hoping to pick the brains of the experts. I have a Cub Cadet XT1 LT46 I bought in 2016 with a Kohler 725 engine in it. Last Fall it started surging when I started it. I added Fuel Mechanic to it and it seemed to smooth it out. When I put away for winter, I changed oil, drained tank ...Bobcat 225 surge at idle. 02-02-2020, 11:03 AM. I’ve got a bobcat 225nt, with kohler engine. Used it yesterday and ran perfect, today it’s surging at idle, but perfect under load. Any ideas? Has new plugs, new fuel and air filter. Edit:... scratch this. I got to thinking about it, and remembered the guy I bought welder from said he cleaned ...I hope one of you fine folks have a suggestion or two for me. I was given a cub cadet ltx1050 tractor with a sv730 Kohler engine. Its 4 years old and has 82 hours on it. A head gasket was blown, so I replace them both. The mower sat for one season. Prior to and post repair, the engine revs up and down at an idle. On WOT, seems to run smooth.Mar 18, 2018 · It has a Kohler CV-15 single cylinder engine. Last fall it started running lousy and surging, then I couldn't get it to start a few weeks ago. I planned to clean and rebuild the carb, but found a brand new carb for $5 more than a rebuilt kit, and installed that yesterday. Got it started and it runs great but still surges.

Learn my quick tip on how to fix a surging generator. this is not 100% going to work all the time but it dont take much time to check if this quick tips stop...I have a cub cadet zero turn with a kohler 7000 series engine that surges. I have replaced carburetor, fuel filter , spark plugs with all kohler parts. Cleaned the fuel system and direct fed fuel to carburetor. And still same problem. Any ideas? Mechanic's Assistant: Do you know the model of your Kohler engine? How old is it?JACUSTOMER-f89ogxkw- : I down loaded the service manual and followed the instructions for throttle adjustment, they seemed to check out. but was just makeing sure the limit screw was in place. The parts breakdown of the engine control was not detailed enough to help me. looking for more complete instructions. the springs look to be in place but ...Kohler engine cv16.5, type ps-43527 engine will not idle down to low rpm, despite adjustments to carb and linkage. ... It runs and cuts fine but I am unable to idle the engine when slowing down the throttle. ... I have a Kohler Command CV491 17.5 HP in a John Deere L110 residential riding mower that begins surging after about 15-20 minutes of ...I’m running out of Ideas on this Kohler EFI 2 Cylinder Engine (ECH 749-3018)I changed the Ignition Coils, the Injectors, Spark Plugs, Engine Oil and Filters....

Loosen the spark plug wires, and with engine idling, remove one plug wire at a time, if engine dies when either wire is removed, the opposite cylinder is not firing. If one cylinder is not firing, it will cause the surging. Check cylinder for spark, with Kholer, it can be a bad coil. Kohler recommends replacing both coils , if one is bad.15. Oct 2, 2014 / 26 HP Kohler Courage on Craftsman DGS 6500, intermittent surging. #1. I recently bought this tractor used and since getting it home it has surged or lost power (with a gas smell when it loses power) and then surged back to full power. It happens both when mower is engaged and not.Partially clogged idle circuit jet in the carb. When an engine is running even at top no load the engine is running on the idle circuit of the carb. when you put a load on the engine it transitions to the high speed circuit to get its fuel. Dec 28, 2011 / Engine Surge 20 HP Kohler Command #6. H.Engine: OHV17 - 204603A (on a Murry 46" riding mower), D.O.M. 7045 S Problem: Difficulty starting - has to crank over for more than 20 seconds to "catch" and fire, then surges at high idle. idles smoo …i have a cub cadet ltx 1042 with a kohler engine 597 cc with a surge off fast rpm and stall rpm go up and down ... 2005 cub cadet lt1042 kohler 19hp cant get it to idle or run smoothly. new starter fuel filter carb kit spark plug air filter.high idle smoother but low idle rough. fuel filter does not fill up all th ...

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10,296. Jan 20, 2023 / Kohler 19hp with Nikki surging. #2. Anytime you remove a carburetor you must do a static governor adjustment once it is reinstall. Even then a few have governor weight wear that requires a little tweaking like some the engines I do here that a .010 feeler gauge is use to set the adjustment. F.Kohler is a popular engine manufacturer, but like any brand, it has its share of problems. One common issue with Kohler engines is fuel pump problems. Fuel pumps are designed to deliver a consistent flow of fuel to the engine, but over time they can wear out or become clogged with debris. This can cause the engine to run rough or even stall.I have a Ariens riding lawn tractor. Model 93603800/A19K4Z 42in. Hydro tractor. The engine surges at idle out of gear. I also need to find a place to get parts for kohler 19 hp. Model SV590S My phone … read more1219 posts · Joined 2011. #1 · May 28, 2023. I have the original M20 on my mid 90's 20G. It has the Walbro adjustable carb. A few months ago it started randomly surging under load so I put on an electric fuel pump for fun and replaced all the fuel hose and the filter. In-tank filter was clean but I cleaned it out with acetone anyway.Craftsman snowblower model 31AS6BEE793. I purchased this last year and it ran perfect all winter. This winter, it has developed a surging problem while at full throttle. So I tore apart the carb, let it soak in some solvent, sprayed out the Jets, etc and reassembled it. The surging problem still exists. While in full choke, or one click less ...Allow the engine to come to low idle. 2. Turn the key switch off, or push and hold the stop button until the engine stops. 3. When required to run the engine out of fuel, leave the throttle control in the fast position and run until the engine stops. 4. Turn the key switch off. 5. A constant speed unit is normally controlled

Oct 11, 2019 · Lean on the idle circuit causes a surge because the engine without enough fuel on the idle side will start the slow and as it slows it tries to open the throttle which in turn then opens the high speed jet and the engine speed picks back up, and then starts to slow back down and is running lean on the idle circuit and the cycle repeats. Posted July 15, 2019. Surging at high rpm and load can be caused by a lean hi speed jet. Even though it is fine while adjusting with no load. Richen up 1/4 to 1/3 turn and then put a load on the engine, and adjust accordingly. If you don't have a carb with adjustable high speed jet then...Engine: OHV17 - 204603A (on a Murry 46" riding mower), D.O.M. 7045 S Problem: Difficulty starting - has to crank over for more than 20 seconds to "catch" and fire, then surges at high idle. idles smoo …Here is the procedure if you need it; With the throttle control at idle or stop position (not running) push the governor arm to where the carb. throttle shaft is at wide open position. Pay attention to which way the governor shaft the arm is attached to rotates. Now loosen the arm retaining screw and while holding wide open grab the end of the ...May 24, 2013 ... FIX Engine Surging on any small engine QUICKLY ... Briggs and Stratton, Lawn Mower Engine Surges, Troubleshooting Surging, Low Idle RPM No Power ...Kohler 7000 series surging. ... I have a KT725 engine on this 2014 Z-Force ZTR. About 2 years ago I ran out of fuel while mowing. ... No longer needs choke to not stall while engaging the blades... idles and runs smoothly at high idle w/no load. I hypothesize this was leaking on the carb to intake manifold gasket. Upper red circle on my earlier ...Watch at proclaimliberty2000 how fixing a small engine that's surging might be easier than you think.Disclaimer: Under no circumstances will proclaimliberty2...The coronavirus pandemic has led to a surge in downloads of mental wellness, and specifically, those focused on meditation, dealing with anxiety and helping users fall asleep. Acco...It has a Kohler CV-15 single cylinder engine. Last fall it started running lousy and surging, then I couldn't get it to start a few weeks ago. I planned to clean and rebuild the carb, but found a brand new carb for $5 more than a rebuilt kit, and installed that yesterday. Got it started and it runs great but still surges.Mar 11, 2012. Threads. 55. Messages. 14,765. May 26, 2013 / LT155 CV15S Surging (I know it's common) #3. If you can get it to run fine a idle, I suspect that your problem is with the high speed circuit in the carb. My suggestion is to have the carb ultrasonically cleaned and install a carb rebuild kit.Removed the bowl & needle. Then sprayed a couple of squirts of carb cleaner in the fuel inlet, then back the other way. Then the same with the sea foam spray (top engine cleaner and lube) Then up the main nozzle. Put all that back together and still getting a surge at low idle and a little backfire through the carb.

Backfiring through the carb. 1) timing too far advanced. 2) mixture too lean. 3) inlet valve not closing. 4) exhaust not opening fully. Pick one, or two or three or the whole shooting match. I have seen an engine with all 4 . The culprit was a mouse. That couldn't have been just a regular mouse.

T. theguyfromfaust Discussion starter. 36 posts · Joined 2006. #1 · Oct 5, 2007. Truck just started doing this today. When idling, it will kinda surge, get louder and knock a little then back down to normal over and over. Started doing it while im driving too, and it seems to be getting worse. When I give it throttle it surges.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 ...Is the small engine in your power equipment surging up and down? This can be a serious issue that will decrease your machine's performance! 😲Don't worry tho...Kohler CH750 speed hunting, backfire carb, runs backwards. Hello, CH750 0026 spec. Installed new carb, test ran great for 45 minutes. Engine started surging. Could see the governor lever working. Smoothed out with choking the engine at 1/2 throttle. Will not run full rpm, only partial rpms and only on choke. Checked for intake leaks, none found.A systematic approach to solving the problem is often the best way to track down and then correct engine problem, according to Kohler Power. The first step of troubleshooting to fi...May 24, 2013 ... FIX Engine Surging on any small engine QUICKLY ... Briggs and Stratton, Lawn Mower Engine Surges, Troubleshooting Surging, Low Idle RPM No Power ...3,023. Feb 28, 2020 / Kohler 24 surge at low idle. #1. Kohler 24hp. M# KT735-3012. I'm guessing it's gonna have to be cleaned out thoroughly. The gas was from last fall. Some small bits of something in the carb. bowl. Bout the size of the end of a pen or smaller. After draining all the fuel, adding new non ethanol and running it for about 20 or ...

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My Craftsman T210 has the Kohler 5400 KS540-3011 18 hp single cylinder engine. This year it started surging while running at full throttle. I'm looking for suggestions on how to fix it, and if this engine has a plastic governor gear. Broadly speaking, surging is usually a fuel or carb issue. At a given throttle setting, the carb isn't providing ...Fuel Flow: Make sure fuel is reaching the engine. If not, clean or replace the fuel filter. Check Starter: If you hear a clicking noise but nothing else, your starter might be the issue. A quick repair or replacement usually does the trick. 2. Kohler 7000 series carburetor problems. Carburetor troubles in a Kohler 7000 series can damage your ...If your mower engine is a Honda or Kohler, the fix is simple. Honda and Kohler’s surging is commonly caused by a blocked idle jet see “Gas starvation” towards the end of the page. If you need more help, …The number one cause for high idle is an imbalance in air pressure. An engine that is idling too high may be caused by a faulty idle air control motor valve that has completely fai...Diagnosing a missing and popping sound on a John Deere L110 with Kohler Command Engine. This can happen to any single cylinder or even the twin Kohler Comman...The Kohler 25-horsepower V-twin engine features overhead valves and full pressure lubrication with full-flow filter. The governor measures and regulates the speed of an engine. If the engine is revving too high or too low, a sensitivity adjustment fixes this problem. This only a few moments.The Kohler 25-horsepower V-twin engine features overhead valves and full pressure lubrication with full-flow filter. The governor measures and regulates the speed of an engine. If the engine is revving too high or too low, a sensitivity adjustment fixes this problem. This only a few moments.flienlow Discussion starter. 54 posts · Joined 2017. #1 · Dec 17, 2018. I am not an expert here, but my '17 6.7 has started "Surging" and is most noticeable when cold. The Tech at the dealer states "these do this" which I think is a cop out. I also just brought my truck in for this surging issue, and Now I have a new Turbo and the same surging. ….

Firstly, check to see that the carburetor is securely attached to the engine. Secondly, with a running engine, spray engine starter onto the gaskets and listen for a change in the surging. The engine starter spray will immediately have an effect, replacing the air being sucked in with a combustible substance.Turn the Kohler carburetor adjustment screws in or out to set a low idle speed of 1200 RPM (+/-75RPM). Then use a tachometer to check the speed. For a basic engine, there is a recommended level of low idle speed of 12000 RPM. Maintain a low idle speed level of 1500 RPM to get the best result when adjusting the carburetor on the Kohler K series.Read Kohler V-Twin Oil Leak (5 Quick Ways To Fix) 5. Oil Leaks. Problem: Oil leaks are not uncommon with Kohler Courage 20 engines. Solution: Oil leaks can be messy and, if left unchecked, can lead to engine damage. To address oil leaks: Inspect gaskets and seals. Carefully examine the engine for any visible oil leaks.One of the most common issues to plague generator owners is the dreaded "surge" or "revving up and down" of the engine. This can happen when the generator is under load or when it's simply at idle. As a general rule, a portable generator will surge at idle due to a clogged or restricted pilot jet on the carburetor.This is a late 90's model Scott's lawn tractor with a Kohler engine. After sitting a few years, it would start and run, but needed a little TLC to resolve th...These leaner and cleaner engine requirements have required calibration changes that affect idle and high speed needle tips, finer threads, tighter tolerances to gaskets and diaphragms. Needle settings can now range between 1 ¼ turns to 4 turns open after seating. The procedure has always been that Walbro pre set the needles to a specific ...Going to try the TPS relearn when I get a chance. If necessary will try the ECU reset. Apparently a lot of problems can be solved by an ECU reset, which causes the motor to re-learn a lot of the sensor inputs. Motor could be running a bit lean, which the ECU reset will fix. In fact the problem could be that the ECU is still running as it was ...Kohler engine cv16.5, type ps-43527 engine will not idle down to low rpm, despite adjustments to carb and linkage. ... It runs and cuts fine but I am unable to idle the engine when slowing down the throttle. ... I have a Kohler Command CV491 17.5 HP in a John Deere L110 residential riding mower that begins surging after about 15-20 minutes of ... Kohler engine surging at idle, Jun 19, 2011 / 25 HP Kolher Comman (Cub Cadet LT1050) Surging acting like out of gas. #6. Make sure your fuel filter is made for a tractor with a fuel pump. If the microns are to fine you will starve the tractor of fuel. I had this happen on one I had to watch the fuel filter for some time before it ran out of gas., Help needed with surging Kohler Command V-twin. The 22.5 Kohler Command V-Twin on a Craftsman GT 22.5 tractor has started to surge at mid-rpms. The engine is nearly new, only 20 or so hours on it. When parked last fall, it ran perfectly. Upon startup this spring, it surged at low idle and backfired at the same time., Jul 3, 2020 / KOHLER 19 SV590S Surging. #1. My Toro Time-Cutter Zero-Turn Lawnmower Surges whenever there is no load. It is fine as long as the blade is engaged but when dis-engaged or even when going down a hill with the bade engaged the engine surges. I removed the carb, cleaned it and sprayed cleaner through all the ports, everything looked ..., 8 posts · Joined 2010. #1 · Aug 19, 2010. I just bought this truck and have lots of plans for it. When I drove it home today (about 60 miles) I noticed a couple of things that didnt seem quite right. 1 is that when you come to a stop when it drops down to idle the engine surges from 900 rpm to 400-500 rpm and back several times and then ..., It violently surges at full throttle. Runs fine at idle and mid-throttle. I have done all I know, and now am stuck. I recently purchased a used 1997 Craftsman GT, 917.258921, with a 25hp Kohler Command Twin, hydrostatic drive, and 50" deck. Engine is CV25S, Spec: 69511, Serial: 2633205137., Oct 27, 2014 / surging engine problem on a kohler 25 hp Pro #2 Kohler Engines: Owners and Service Manuals: Manuals and Maintenance Locate your engine numbers and click on service manual, troubleshooting section., When I first fire it up, the mower (Kohler Engine) runs smooth. However, as soon as the motor warms up it begins to surge in a very rhythmic surge and idle back, surge and idle back. If I drive the mower (not idle) the surging goes away and if I engage the blades, the surging goes away. I have put a new fuel filter on, new spark plugs, new fuel ..., If your mower engine is a Honda or Kohler, the fix is simple. Honda and Kohler's surging is commonly caused by a blocked idle jet see "Gas starvation" towards the end of the page. If you need more help, check out the "How to fix a surging mower video." If your surging mower is a Honda, check out the "Honda mower surging video.", Jun 5, 2021 / Pressure Washer with Honda Engine Surges. #2. Idle circuit in the carb is plugged. You can try giving the carb a good cleaning, but at the cost of today's Honda carbs it might be cheaper to replace the carb. Pressure washers normally sit for long periods between use, so future solution is to never allow old fuel to sit in the ..., My Craftsman T210 has the Kohler 5400 KS540-3011 18 hp single cylinder engine. This year it started surging while running at full throttle. I'm looking for suggestions on how to fix it, and if this engine has a plastic governor gear. Broadly speaking, surging is usually a fuel or carb issue. At a given throttle setting, the carb isn't providing ..., Most two-stroke engines have two screws that allow you to adjust the carburetor. One of these screws adjusts the mixture of the gas/oil/fuel mixture, and the other screw controls the speed of the idle. To adjust the carburetor, you need to have the engine running. Slowly turn the screws to adjust the carburetor until the engine is running smoothly., 657 posts · Joined 2003. #1 · Sep 12, 2009. 25 HP Kohler Command on a Bob Cat, Pops, back fires, and misses under a load. This happens at all engine temps. It almost seems like a bad valve. We did a compression check and were getting about 190 pounds on each cylinder. The exhaust smells like its running lean., To access the idle jet, may need to remove the idle adjuster screw. Remove the jet, no need to remove carb (screw or pressed fit) Using fine wire clean the jet (I use wire brush strand and carb cleaner) Clean the idle jet passage. Refit jet and test. Not all carburetors have an idle jet; if yours doesn’t, go ahead and clean the carburetor ..., Tach surges up about 500 rpm and back to idle about every 3 seconds. Probably happens once or twice a week. Doesn't seem to matter if engine is hot or cold. Engine stumbles from idle. Tach drops down from idle to nearly 0 for less than a second and the engine stumbles like it will stall but doesn't. Usually happens as a single isolated ..., This post explains what you should do when surging occurs. Pressure washers surge during idle because its filters are blocked, the carburetor is clogged or there is a defective spark plug. Any of these problems will prevent the engine from running correctly. Cleaning or replacing the clogged parts is the best solution., KS540 | 5400 Series | KOHLER. Home / Engines / Gasoline Engines / 5400 Series., This is a replacement engine newer design with about 800 hours. Engine runs at speed then completely stalls to about 300 rpm then surges back to regular speed. Continues repeatedly. Problem presents in hot weather over 70F. Problem presents more under load (pto) but not always. Problem presents more when turning left. Mower almost unusable., Is your riding mower engine surging mostly UNDER LOAD at MID RANGE THROTTLE / RPM? Check this somewhat hidden and fragile carburetor linkage spring first bef..., Read Kohler V-Twin Oil Leak (5 Quick Ways To Fix) 5. Oil Leaks. Problem: Oil leaks are not uncommon with Kohler Courage 20 engines. Solution: Oil leaks can be messy and, if left unchecked, can lead to engine damage. To address oil leaks: Inspect gaskets and seals. Carefully examine the engine for any visible oil leaks., So, the best course of action is to seek the advice of a skilled mechanic. 8. Oil leaking & Smoking All over: This is another common issue with Kohler Courage engines, where the engine may start excess oil leaking and users will also notice smoking all over the place., Engine idle issue. Seems to run fine under load. Thanks for any advice! 24hp Kohler 7000 KT735 ... Kohler has done this for years. Cleaned and lubricated everything, read a lot about problems with the governor linkage, replaced gaskets, and it always returns quickly. Since it's my personal and really doesn't affect anything (runs fine with any ..., The issue is on a woodlands mill hm126, fitted with a kohler 9.5hp CH395 command pro. I can't get it to run an idle speed without feathering the choke. Open the choke and it dies after a few seconds. If I open the throttle whilst its still running it runs up to maximum speed with no problem, but the high speed without load sounds weak and ..., 3. May 7, 2015 / Kohler Command Pro 26 EFI backfiring Problem. #1. I have a Walker Lawn Mower with a Kohler Command Pro 26 EFI engine in it. It ran fine when I finished last season. When I started it this year for the season it would run fine until I engaged the blades and then it lost power and had a miss in it and would backfire when idling ..., Fuel Flow: Make sure fuel is reaching the engine. If not, clean or replace the fuel filter. Check Starter: If you hear a clicking noise but nothing else, your starter might be the issue. A quick repair or replacement usually does the trick. 2. Kohler 7000 series carburetor problems. Carburetor troubles in a Kohler 7000 series can damage your ..., ECH730. Find A Dealer. If you want lower operating costs and less downtime, the fuel-sipping KOHLER® Command PRO® EFI is your engine. Closed-loop electronic fuel injection saves you big on gas and covers more ground between fill ups.*., Agreed, the idle jet is likely the cause. It *is* interesting that choke doesn't help, but if it's really-lean, maybe the choke still isn't enough to change it. I have tried Seafoam for surging engines, once even trying emptying the tank, and drawing "pure" Seafoam into the carb, and letting it sit a few days. Basically what you did. It did not ..., 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 a little bit. I have to apply the choke to start it even when ..., If troubles persist after checking the possible causes listed or you are unable to identify the problem, call KOHLER Engines Customer Service at 1-800-544-2444 or contact your local KOHLER dealer., #briggsandstratton #carburetor #cleaning More Videos On Amazon - https://www.amazon.com/shop/influencer-44ec13c3Bought a cheap lawn mower and the Nikki carbu..., A leaking fuel injector can cause the engine to run rough, which might cause an extended crank and hard start when hot. Kohler Engine leaking issue. A lot of symptoms are engine stalling and backfiring, difficulty starting the vehicle, poor acceleration, and a rough idle. Fuel leaks into the combustion chamber might be shown., May 6, 2010. Threads. 39. Messages. 9,838. Oct 29, 2013 / Craftsman Kohler Command CV20S surges & backfires. #3. I suspect that black wire is the grounding lead for the voltage regulator. On some engines there is a wire between one of the plastic cover mounting screws, and one of the screws that attach the voltage regulator to the plastic cover., Backfiring through the carb. 1) timing too far advanced. 2) mixture too lean. 3) inlet valve not closing. 4) exhaust not opening fully. Pick one, or two or three or the whole shooting match. I have seen an engine with all 4 . The culprit was a mouse. That couldn't have been just a regular mouse., 6,973. Sep 5, 2018 / Kohler Command Pro 27 runs good until it loses power. #2. You have 2 circuits in your carb. Idle and high-speed. Sounds like you have a partially blocked high-speed circuit. Remove the carb and clean all the little holes in the carb with a small wire/s. Run it from the carb back to the bowl.