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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Diagnosis
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<blockquote data-quote="vibrac" data-source="post: 129634" data-attributes="member: 60"><p>Well the problem with the Road Comet was that the old racing 90 bore barrel needs replacing as does the piston. I have a number of standard barrels and pistons and a top hat to fit the crankcase so I think that's the most economical thing to do. I have too many costly rebuilds on at the moment thanks to increased workshop time and decreased outside events this year, but I will replace the big bore at some point when the Comet racer gets on the bench so if you know of a suitable supply of 90 bore pistons and liners I shall need some sometime in 21.</p><p>The other anoyance was the continual oil leak at the base of the push rod tubes, I have some Flash works push rod tube assemblies but found that they would not accomodate the angle I needed at the head (they may fit on the new head and barrel). I tried a number of methods to seal the standard tubes including the two O ring solution but I think the solution will be found in the curing of the piston problem (ie perhaps it was excess crankcase pressure). Also the sugestion of getting new pushrod tubes with perfect cirtcular ends is a good one. I also need to revise the wiring and switches to control the electric start better and get a small lithium battery to fit a dummy case as the big (12Ah)gel I have at the moment starts it OK, but according to the ammeter afterwards it would not stand a bout of repeated starts, and the suggested one(18Ah) is huge and nearly reaches the final drive chain on the other side, and its weight doesnt bear thinking about. Ah wel! another busy workshop in lock down, Heck I may even get some work in over Xmas! Its not all bad news is it!</p></blockquote><p></p>
[QUOTE="vibrac, post: 129634, member: 60"] Well the problem with the Road Comet was that the old racing 90 bore barrel needs replacing as does the piston. I have a number of standard barrels and pistons and a top hat to fit the crankcase so I think that's the most economical thing to do. I have too many costly rebuilds on at the moment thanks to increased workshop time and decreased outside events this year, but I will replace the big bore at some point when the Comet racer gets on the bench so if you know of a suitable supply of 90 bore pistons and liners I shall need some sometime in 21. The other anoyance was the continual oil leak at the base of the push rod tubes, I have some Flash works push rod tube assemblies but found that they would not accomodate the angle I needed at the head (they may fit on the new head and barrel). I tried a number of methods to seal the standard tubes including the two O ring solution but I think the solution will be found in the curing of the piston problem (ie perhaps it was excess crankcase pressure). Also the sugestion of getting new pushrod tubes with perfect cirtcular ends is a good one. I also need to revise the wiring and switches to control the electric start better and get a small lithium battery to fit a dummy case as the big (12Ah)gel I have at the moment starts it OK, but according to the ammeter afterwards it would not stand a bout of repeated starts, and the suggested one(18Ah) is huge and nearly reaches the final drive chain on the other side, and its weight doesnt bear thinking about. Ah wel! another busy workshop in lock down, Heck I may even get some work in over Xmas! Its not all bad news is it! [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Diagnosis
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