why do i backfire?

i loose power that i know i have once i get a little above 30,my head is being pulled back then i hit 31 and it slows and backfires.its not timing because its cdi.could it be jet size?

Re: why do i backfire?

See Ya Moped Army /

<why do i backfire?>

Too many 7-11 Burritos????

Re: why do i backfire?

Can you adjust the CDI?

what moped are you talking about? and it better be a moped!

Re: why do i backfire?

Can you explain what you mean by backfire?

A backfire is when burning mixture jets out of the carburetor & intake.. if it's a loud bang from the exhaust, that's something different - the charge is exploding in the pipe. Some people call this an 'exhaust backfire' but it's a weak use of the term.

Which one is it?

huh??

In the eternal quest for more power there's no such thing as too many burritos!

Re: huh??

joew,

That is ... just plain wrong. Lol.

I'll take the baked beans, but I'll pass on the cottage cheese.

Re: huh??

See Ya Moped Army /

I saw that pic in Autoweek magazine the other day. It's hysterical.

Re: huh??

larry and joe have it right,i cant adjust the cdi but if i did it would have no impact.its a motor from a korado on a magnum with an airsal kit and a 15 mm amal.from 0-10 its normal then 10-30 its fucking great then after that its sucking.i dont know where to go from here.ive put the mixture screw in alot of different positions but still no avail.im lost except from the jet thing but a 60 is too big.i might just buy everything between a 45 and 60 and then bitch after when i feel i have a reason

Re: huh??

LOL

Re: huh??

It sounds like your unit is four-stroking from running too rich at top end.

This can be causes by the jet being too big or that the air filter is too restrictive. It is also possible that you will need a larger carb.

Try one jet size down but be carefull to do your plug chops. You do not want to sieze the engine.

Re: huh??

its not four stroking.i know that feeling,sounds like its farting.once i get a little over 30 it feels like im hitting the brakes and its backfiring,mostly from the pipe but some from the carb.

Re: huh??

Check your timing. It could be too advanced.

Also: have you done any porting work? You could have too much overlap. The pulses in the pipe could be drawing all the fresh gas charge out into the exhaust.

Re: huh??

it could be that with the pipe,it did run better with the leo vince pipe.its cdi so theres no points,everythings electronic and no way to do the timing thing

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