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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New member, and comet question
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<blockquote data-quote="timetraveller" data-source="post: 94298" data-attributes="member: 456"><p>It might or might not be significant that the piston seems to have suffered worst at the side, not fore or aft where the valve cut outs are. One thing that became clear after a few years of the (then) new low expansion and low clearance pistons was that three to three and a half thou was not enough clearance. It might be alright if everything is correct but the base of many cylinder barrels/muffs is not perpendicular to the bore. I, and others I know, have checked several muffs and generally find that the base is off by several thou. Re-machining the base is the way to go using specially made plugs with centres to go in each end of the liner.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 94298, member: 456"] It might or might not be significant that the piston seems to have suffered worst at the side, not fore or aft where the valve cut outs are. One thing that became clear after a few years of the (then) new low expansion and low clearance pistons was that three to three and a half thou was not enough clearance. It might be alright if everything is correct but the base of many cylinder barrels/muffs is not perpendicular to the bore. I, and others I know, have checked several muffs and generally find that the base is off by several thou. Re-machining the base is the way to go using specially made plugs with centres to go in each end of the liner. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New member, and comet question
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