air intake

This is my first post! For the next track season I am considering upgrading my RC 390 by installing a free flow exhaust and a high flow air intake, completing the upgrade by installing a PCV and getting a custom map om the dyno. This is my current plan: Exhaust: -Install a cat delete pipe in...

The surging on my RC390 seemed to be getting worse so I decided to try a booster plug. It arrived with instructions that were vague (as far as I am concerned, I am very familiar with jet skis but don't have a lot of experience working on motorcycles). #1 on the install instruction sheet says...