Again jetting dilemma

I changed my mainjet from 168 to 175 and lowered te needle from clip 4 to #3 (WR400 '99, WRtiming, YZ exhaust).

The bike rides pretty good, but the spark plug is black.

When i start the it when it's cold i have to be very carefull, I miss the start, I have to clean the sparkplug or it won't strat anymore.

They always say the sparkplug must be almost i have to worry about its colour if it rides good ??? :)

Try leaning the pilot screw rather than the needle clip. Possibly turn the pilot screw in and use clip #4 or #5.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now