212cc predator cam and springs. ..bad throttle response

#1
I installed a header, dyno cam, and 18lbs springs. It idles perfect but one you give it throttle it hesitates and backfires. And if you give it throttle and hold it, it has uneven rpm and like its restricted.
I DONT HAVE INTAKE OR BIGGER JET. AND STOCK FLYWHEEL. .....HELP
 
#4
You pretty much answered your own question with what you said you dont have. You need to re jet the carb and put a better flowing filter on it. Thats a good start anyway.
 
#6
Pull the spark plug out after running hard and look at the color of plug. This will tell ya if you lean or rich on the fuel mixture. The muffler has a big effect on it. I had 2 of the same motors but different mufflers and the one with free flow used a 37 jet and restricted one a 32 jet. This what I have found on these predators. They are really sensitive to changes.
 
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