WR400 carb slide breakage problem??
Posted December 08, 2003 - 11:46 AM
Posted December 08, 2003 - 12:00 PM
Most of the guys here get a replacement Valve pin machined out (last longer). The main reason for the short life span of the valve pin is due to a design fault as well as the high compression of the wr400. Another reason is that, the o-ring at the back of the valve pin is not replaced when it is worn down.
hope this helps
Posted December 10, 2003 - 04:30 AM