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Engine Problem, Hard to Start. Kawasaki 08 600 Mule. Long Post.

JWS

By JWS
in Kawasaki UTV SxS Forum

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JWS Newbie

JWS

Posted
Posted

Help Please!

Last year my Mule started running bad and was hard to start. NOT a battery or starter problem. I replace the carb with one of those cheap Chinese carbs from Amazon. Problem got worse. So, I replaced the fuel pump, one from Kawasaki, fuel filter and lines. Then replaced the fuel pump line to the engine. Finally bought a Kawasaki carb. Everything was ok till I filled the gas tank with fresh gas then it started running bad and hard to start again. The tank is clean. Gas is fresh, AGAIN. Filter is new. When running it has an occasional misfire. Managed to burn about a gallon out of the tank. Runs better. Replaced the gas cap in case it wasn't venting. No change. When running, if you try to go full throttle, it bogs down. The gas is good. I use it in my mower with no problem. The stater was replaced about one year ago and the flywheel cleaned inside. Still seams like a fuel problem but I'm at a loss. It's going back to the mechanic shop today. We use the Mule every day, live on a farm. It's never sat up. It has 1045hrs on it. New battery and starter.

Any ideas?

Scott Meszaros Contributor

Scott Meszaros

Posted
Posted

2015 Mule.....same problem  with not running right, bogging down,  misfiring .....on mine, there are two fuel filters, one under seat, one closer to engine......that was the issue......dealer changed both, back in business.....................

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motojoe Contributor

motojoe

Posted
Posted

Also, those Kawasaki Mules that have the two cylinder engines are subject to their push rod bending, that also could cause  the engine not to start and or running poorly.

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JWS Newbie

JWS

Posted
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Mechanic that changed the carb said that it is running rich. Screw has a limiter on it. Any ideas on how to get it off and lean out the carb?

motojoe Contributor

motojoe

Posted
Posted

On the top of the carburetor take off the two or three screws and remove the needle and adjust the "C" clip move it down one position and test to see if that helps.  As well adjust the fuel\air adjustment screw that is either on the front or the rear of the carburetor.  When the engine is running (idle) adjust the screw until the engine starts to speed up then adjust the idle screw until the engine Idles at the speed that you want.

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  • 2 weeks later...
JWS Newbie

JWS

Posted
  • Author
Posted

Well mechanic did a plug reading, new plug, found it's not rich but lean. Adjusted mixture screw out and engine starts and runs better, BUT, if you stomp on the gas it dies. Bring it up slowly and you can get full throttle. This carb has throttle plates, not a slide like M/C carbs. Still in the shop. Going to check valve adj next and then compression.

motojoe Contributor

motojoe

Posted
Posted

Your engine is still running lean!  Adjust the air/fuel screw and if you can't get it to run better then take off the top of the carburetor and adjust the needle by setting the "C" clip one slot further down to get a richer fuel mixture. 

  • Like 1
  • 5 weeks later...
Travis Grand Master

Travis

Posted
Posted
On 10/31/2025 at 12:26 PM, motojoe said:

Your engine is still running lean!  Adjust the air/fuel screw and if you can't get it to run better then take off the top of the carburetor and adjust the needle by setting the "C" clip one slot further down to get a richer fuel mixture. 

unfortunately now how the float systems works on a 610 carburetor, this is basically a lawnmower engine,

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