NEW TO A 99' YZ400 AND IT IS LOUD. I HAVE A PC T-4 FULL EXHAUST ON IT AND I WAS WONDERING IF ANYONE HAS TRIED THE "QUIET CORE INSERT" (or something like that) THAT PC OFFERS?
ALSO, I MAY BE OPENING A CAN OF WORMS BUT WHAT DO MOST OF YOU GUYS RUN FOR OIL? (type and weight?)
ALSO, I MAY BE OPENING A CAN OF WORMS BUT WHAT DO MOST OF YOU GUYS RUN FOR OIL? (type and weight?)