why does it do that????

[250rider]

my plug keeps on fouling out, i know i probably need to change my jets but do i go up or down witht the jetting, my plug is black and soaked in gas.

[member]

im not too smart but i think u need to go down a couple sizes

[sprtrx300ex]

Whats your jetting?

[250rider]

i dont know bc the guy that did my motor work doesnt know either, i just called him and he said that he forgot.

[sprtrx300ex]

Well, from the sounds of it, it seems that your to rich. Does it cut out or studder anywhere ?

[250rider]

sometime when i let off it likes to bog alot.

[ReconRider25]

ur running rich. go down a couple sizes.

[mustang93]

We dont no your whole story but its not always the jetting. check the ignition system for a strong spark. if a coil or stator is on the way out you may have to weak of a spark uncapable of burning the mixture. this happened to me on a 2 stroke boat every time I wanted to go out Id have to clean the plug or it wouldnt start. eventualy I got sick of it and tested the ignition system. bad stator $400 later empty wallet & no more problems with the motor

[wilkin250r]

A fouled plug can actually be a number of problems. It could mean that you have the wrong heat range plug, it could mean you have poor compression, it could be a weak spark, or it could mean that your jetting is too rich.

Check the jetting first, it's the easiest.

[sandspanker]

:mad: start by using a 17 mm wrench take the bottom float bowl bolt out then get a 6mm socket and take out the main jet and look to see what main jet it is.and then ask your question:huh