July 3, 200521 yr i have had to have an engine rebuild on my 03 gasgas do i need to bed the engine in again? and for how long? as far as i no it having litle/big ends and other parts aswell
July 3, 200521 yr with a new piston they normally advice you to do three heat up/cool down cycles before starting to ride it normally. The piston heat up and cool down cycle makes for good bed in.
July 3, 200521 yr The vast majority of my engine building experience is with big, air-cooled 4 strokes, but I have found that if I break in with synthetic or semi-synthetic oil, the rings will never break in and the engine will smoke. I have even had problems with regular petroleum oil because it's getting so good. I used to slather everything with oil, so something would be there for start-up, but now I assemble top ends dry and this helps the rings bed in. Maybe somebody with more experience with modern trials bikes could comment.
July 4, 200521 yr Author im shure it has had new pistons and a recoted cylinder. it should be back sometime this week. its due to the airbox not being sealed properly and crap has got through. cheers for the help
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