sputter sputter??

vwine · Jun 25, 2010

When riding, I get about 28-30 mph and the bike sputters like crazy.... in a misfiring kinda way.
it does this on flat land... It can go alot faster with my 34t sprocket and 66cc skyhawk engine.

The motor doesnt even seem like its even near topping out.. My guess is spark.. I have an NGK plug but stock CDI and Wire.. BUT When i go up the 8% grade hill for a full half mile here at my house, it hauls butt up the hill with no sputtering/misfiring at all.....

anyone know what could cause this?

bairdco · Jun 25, 2010

fuel, most likely. check your plug. if it's black and oily, try raising the clip up on the needle to lean it out. if it's white-ish, go down a notch.

i'm betting it's too rich.

also, keep your air filter sponge clean. if it gets too clogged with oil it can't breathe.

last resort is soldering and re-drilling jets.

Bikeguy Joe · Jun 25, 2010

It's only doing it when on flat ground?

It's four stroking.

Bikeguy Joe · Jun 25, 2010

You could lean it out a bit, but the real cure is to gear up if you can...say from a 44T to a 40T or 36T sprocket.

stevolandis · Jul 24, 2010

Mine did that, it turned out to be the intake tube was loose and there was an air leak. Once I tightened it, the engine worked fine.

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sputter sputter??

vwine

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bairdco

a guy who makes cool bikes

Bikeguy Joe

Godfather of Motorized Bicycles

Bikeguy Joe

Godfather of Motorized Bicycles

stevolandis

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