The plug on my '06 kx250 doesn't last very long

[trist007]

The spark plugs on my '06 kx250 doesn't last very long

Each plug takes about 3 days to foul. Each day I'd ride about 2 hrs. I know the jets come out rich straight out of the factory. Should I go one size down on my jets or should I just adjust the air screw?

 

[mkelly04]

Each plug takes about 3 days to foul. Each day I'd ride about 2 hrs. I know the jets come out rich straight out of the factory. Should I go one size down on my jets or should I just adjust the air screw?

You will probably need to do both.


But first I would suggest finding someone from your area with the same bike and ask for jetting specs from them. That will give you a good starting point. Or go to the local kawi shop and ask what they recommend.

 

[IndyKDX]

google "Spanky's Jetting guide". It gives a good baseline for jetting. really cool.