jse Posted March 30, 2010 Report Share Posted March 30, 2010 (edited) It's a common feature on a Sherco Ah, yes, and just about any two-stroke Trials bike today. From what engineers have told me, modern two-stroke pistons have cam-ground diameters and tapered sides to cope with the unusual temperature extremes (hot exhaust on one side and cool intake on the other, as opposed to the generally uniform temp ranges in a four-stroke piston). When they reach operating temperatures, they expand to the basically consistant circular diameter and straight sided shape we would expect. Jon ps. And, no matter how much I whine, cry, complain and throw myself on the floor, the wife says no NR...... Edited March 30, 2010 by JSE Quote Link to comment Share on other sites More sharing options...
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