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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
piston failure
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<blockquote data-quote="passenger0_0" data-source="post: 23757" data-attributes="member: 208"><p>Hi John, Sounds like you had the right clearance for the specialloid piston. As mentioned earlier, this problem did not originate as a piston seizure, rather it is a detonation issue so the big-end problem is something secondary. I've had this sort of problem before in other British bike engines with the most persistent cause being the spark plug not having sufficiently depth into the combustion chamber. In my race twin engine I had to counterbore both plug holes an additional 4 mm to get the plugs to the correct depth. The location of the failure in the piston is the main clue and I suggest you very carefully look in both the head and cylinder for any signs of local overheating or 'pepper marks' indication detonation damage. I note that both the head and liner around the raised lip are both blackened which indicates they may have been leaking here. Just out of interest there is plently of carbon on the piston so she obviously has done some miles before this problem occurred. Cheers David</p></blockquote><p></p>
[QUOTE="passenger0_0, post: 23757, member: 208"] Hi John, Sounds like you had the right clearance for the specialloid piston. As mentioned earlier, this problem did not originate as a piston seizure, rather it is a detonation issue so the big-end problem is something secondary. I've had this sort of problem before in other British bike engines with the most persistent cause being the spark plug not having sufficiently depth into the combustion chamber. In my race twin engine I had to counterbore both plug holes an additional 4 mm to get the plugs to the correct depth. The location of the failure in the piston is the main clue and I suggest you very carefully look in both the head and cylinder for any signs of local overheating or 'pepper marks' indication detonation damage. I note that both the head and liner around the raised lip are both blackened which indicates they may have been leaking here. Just out of interest there is plently of carbon on the piston so she obviously has done some miles before this problem occurred. Cheers David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
piston failure
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