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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
piston failure
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<blockquote data-quote="nkt267" data-source="post: 23754" data-attributes="member: 245"><p>I was running fairly briskly 2 up, but this is not unusual for me and as I have done somewhere in the region of 5-6 thousand miles on the Comet would not have thought it a problem. The siezure was sudden with no sign of power drop off beforehand, and I stopped the engine immediately.</p><p>There is a possibility of an air leak at the head joint but as I have had an oil leak from the top end I cannot be sure.</p><p>When the liner was bored I specified 5-6thou clearance on the bore, so hopefully I was erring on the right side.</p><p>I was very careful with centering the conrod/flywheel assy, I ground out an old drive side bearing to give a sliding fit on the mainshaft to set up the shims.</p><p>I am concerned about the big end side plates though which is why I am going to fit a new bigend and conrod to my spare flywheels. When I look down at the big end I can see part of the bigend roller ring on the drive side of the con rod, but when I push the rod over I cannot see any on the timing side.</p><p>Either way the engine now needs a re-build I just do not want have a repeat of this problem in another 6000 miles..John</p></blockquote><p></p>
[QUOTE="nkt267, post: 23754, member: 245"] I was running fairly briskly 2 up, but this is not unusual for me and as I have done somewhere in the region of 5-6 thousand miles on the Comet would not have thought it a problem. The siezure was sudden with no sign of power drop off beforehand, and I stopped the engine immediately. There is a possibility of an air leak at the head joint but as I have had an oil leak from the top end I cannot be sure. When the liner was bored I specified 5-6thou clearance on the bore, so hopefully I was erring on the right side. I was very careful with centering the conrod/flywheel assy, I ground out an old drive side bearing to give a sliding fit on the mainshaft to set up the shims. I am concerned about the big end side plates though which is why I am going to fit a new bigend and conrod to my spare flywheels. When I look down at the big end I can see part of the bigend roller ring on the drive side of the con rod, but when I push the rod over I cannot see any on the timing side. Either way the engine now needs a re-build I just do not want have a repeat of this problem in another 6000 miles..John [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
piston failure
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