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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Piston Choice
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<blockquote data-quote="Ken Tidswell" data-source="post: 108057" data-attributes="member: 3355"><p>the 7.3 cr pistons are 8:1's with the piston crowns turned off i believe they fail after a large mileage with hairline cracks across the crowns i have seen these after the event in Bury. There is also an issue with the gudgeon pin circlips which move with the usual catastrophic consequences on the pin milling a groove in the bore . Mahle via the manufacturers in england issued a warning with pictures of such failures. and recommend that the circlips be fitted with the gap horizontally or vertically positioned. to prevent this happening . they accuse the user of over revving the motor for this failure . Sounds like a design fault to me. if the pistons are not scuffed and the ring lands are not worn you could treat it to some new rings</p></blockquote><p></p>
[QUOTE="Ken Tidswell, post: 108057, member: 3355"] the 7.3 cr pistons are 8:1's with the piston crowns turned off i believe they fail after a large mileage with hairline cracks across the crowns i have seen these after the event in Bury. There is also an issue with the gudgeon pin circlips which move with the usual catastrophic consequences on the pin milling a groove in the bore . Mahle via the manufacturers in england issued a warning with pictures of such failures. and recommend that the circlips be fitted with the gap horizontally or vertically positioned. to prevent this happening . they accuse the user of over revving the motor for this failure . Sounds like a design fault to me. if the pistons are not scuffed and the ring lands are not worn you could treat it to some new rings [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Piston Choice
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