300ex missing

[01_300ex]

My 300ex is missing or cutting out, could it be the spark plug.

[phatswinn]

when? high rpm? low rpm? if its high rpm then your main jet is too rich at low rpm it means the needle is too high up

[01_300ex]

Well it used to not backfire at all after i went up on the main jet from a 160 to a 165. But since last Saturday it has been backfiring when I let off of the throttle and then it sputters at the top of each gear and also when hit the throttle hard. I just bought a new spark plug and thats not the problem. The reason i thought that it was the spark plug is because I dropped my other one on the floor and it bent the end of it down.

[mcmike]

Make for sure (100%) that you don't have even the smallest exhaust leak, like around your slip-on's clamp. Mine did the very same thing, and a very tiny hole was the culprit.

[Rastus]

Sounds like its rich.

[01_300ex]

Could the change in weather be a factor. Because around the time it started to sputter is around when it started to get really humid and hot.

[01_300ex]

anyone

i have a simalar problem but when i shake it it goes back to running fine maybe just dirt and mud got in the gas tank?