need help with 2000 yz 125

[penningtonl]

my 2000 yz 125 is fouling plugs when i have about 15-20 mins of ride time. it has good comp and runs good when i have it running. iv replaced about everything i can think of. but i have not messed with the carb. do you think i need to replace the main jet or any of the jets because its getting to much gas or what....... please help....

 

[Chili]

If the bike is mechanically sound then it is likely jetted too rich for the type of riding you are doing. Do a search for jetting on here and get started.

 

[penningtonl]

im running silkolene oil at a 40:1 gas ratio....... i dont no if this is to rich or to lean or what....... and do i just need to replace the main jet because it could be wore out or what............

 

[spark250]

Do a quick search to familiarize yourself with jetting. rich or lean does not always refer to the gas/oil ratio!! There is a lot more to your carb than just a main jet as well.