yamaha blaster New Member Jun 15, 2008 1,193 5 0 Michigan Jul 5, 2010 #1 My yz has a lot of power valve blow by and my exhaust side number plate is like covered in blow by. Why is that if its because its rich I would rather keep it that way then lean it up because I want 2 keep the motor as long as posible.
My yz has a lot of power valve blow by and my exhaust side number plate is like covered in blow by. Why is that if its because its rich I would rather keep it that way then lean it up because I want 2 keep the motor as long as posible.
