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mfuess · 05-12-2007, 07:14 AM

Izzy,

Sometimes it's extremely difficult to totally eliminate four stroking because of exactly what you describbed. When you eliminate the four stroking and you give it fast throttle it goes momentarily lean.

Try this Izzy,
Fire up your engine & let it warm up. Go back to the throttle position where it "four strokes". Then, begin to completely CLOSE of your highend needle. IF the four stroking goes away, this tells you that your float valve setting is a little too high or your float diaphragm is a little too stiff. IF it does not change the four stroking, you have a leak somewhere...
Your engine should run perfectly on the lowend needle up to about 3000 RPM (give or take a little) with the highend needle totally closed. IF it doesn't... it's time to pull the carb and give it a good clean up.

05-12-2007, 07:14 AM	#98
mfuess Bad-ass Super Contributer! Join Date: Apr 2007 Location: Bedford Texas Posts: 202	Re: Gas engine tuning for newbies.... Izzy, Sometimes it's extremely difficult to totally eliminate four stroking because of exactly what you describbed. When you eliminate the four stroking and you give it fast throttle it goes momentarily lean. Try this Izzy, Fire up your engine & let it warm up. Go back to the throttle position where it "four strokes". Then, begin to completely CLOSE of your highend needle. IF the four stroking goes away, this tells you that your float valve setting is a little too high or your float diaphragm is a little too stiff. IF it does not change the four stroking, you have a leak somewhere... Your engine should run perfectly on the lowend needle up to about 3000 RPM (give or take a little) with the highend needle totally closed. IF it doesn't... it's time to pull the carb and give it a good clean up.