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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil Consumption: 100 Miles Per Pint…
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<blockquote data-quote="lee_812d" data-source="post: 162975" data-attributes="member: 5136"><p>The two halves are now separated. Half of the liner flange has cracked away, which based on the carbon looks like and old break. The piston is +0.060" - it has been pointed out to me that this is probably two re-bores (and this might explain the cracking flange as the liner is thinner?).</p><p>The valve seats look clean especially the inlet, the exhaust slightly worse - it didn't seem like there was any leakage here in the leak down test.</p><p>The lock ring is still in place above the loose valve guide, the punch lock marks line up so it doesn't look like it has unwound.</p><p>The exhaust upper valve guide was also loose, as was the exhaust valve stem collar.</p><p>Also loose is the small end bush, enough to turn a few degrees back and forth.</p></blockquote><p></p>
[QUOTE="lee_812d, post: 162975, member: 5136"] The two halves are now separated. Half of the liner flange has cracked away, which based on the carbon looks like and old break. The piston is +0.060" - it has been pointed out to me that this is probably two re-bores (and this might explain the cracking flange as the liner is thinner?). The valve seats look clean especially the inlet, the exhaust slightly worse - it didn't seem like there was any leakage here in the leak down test. The lock ring is still in place above the loose valve guide, the punch lock marks line up so it doesn't look like it has unwound. The exhaust upper valve guide was also loose, as was the exhaust valve stem collar. Also loose is the small end bush, enough to turn a few degrees back and forth. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil Consumption: 100 Miles Per Pint…
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