Almost like hitting rev limiter?!?

nmarco32

New Member
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2:07 PM
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Mar 25, 2019
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6
Hello,
Its a new engine from ebay. The engine is ported with a 36t sprocket and stock exhaust with baffle removed. So far it runs good but when I get into higher RPMS it stutters kinda like hitting rev limiter. I think it happens 15-20 mph. but not completely sure. Is this something to do with the exhaust? vacuum leak? or just tuning issue. Like I said bike does run good low rpm and mid.
thanks for the help
 
Sounds like it might be 4-stroking, which is common with these (they usually run rich out of the box) unless the carb is tuned. My 48CC 2-stroke did the same thing, I had to move the needle circlip inside the carb up a notch to lean it out. Mine still does it slightly under a light load, but I let it be.

Edit: just noticed this is a duplicate thread. I wondered why no one had answered in it yet LOL
 
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