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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Oil Use
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<blockquote data-quote="Martyn Goodwin" data-source="post: 46936" data-attributes="member: 2433"><p>Oh how one can be deceived by these beasts! Over the last 5 days I took part in a non-Vincent rally along with at least 6 other Vincents in attendance. Having installed a regular timed breather recently my oil consumption was negligible with not a trace of a leak anywhere and almost no oil out of the breather - so nice to come out in the morning to an oil tight, clean ground bike. What as observed, however, was that when the motor was under load a significant and constant stream of white to light grey vapour was being emitted from the breather outlet. </p><p></p><p>I should add that over the 5 days I covered just over 1,100 miles at an overall average speed of 52 mph (with a once off GPS max of 77 mph). I also noticed a slight lack (loss) of power on long hills.</p><p></p><p>Today I decided I must investigate so strip and pulled the head and barrel only to find that at some point the front of the piston had "nipped up" resulting in the metal between the top of the piston and the first compression ring having been lost over about a 5 degree arc of the piston. The top ring was jammed in its slot as was the second compression ring. And there are two parallel score marks in the liner - quite severe - I am definitely up for a new piston and quite likely a new liner as well.</p><p></p><p>Bugger. But better found now in my workshop than stuck out on the road somewhere!</p><p></p><p>At least I have something to keep me occupied till the next planned trip (again of around 1,000 miles) next month.</p><p></p><p>Martyn</p></blockquote><p></p>
[QUOTE="Martyn Goodwin, post: 46936, member: 2433"] Oh how one can be deceived by these beasts! Over the last 5 days I took part in a non-Vincent rally along with at least 6 other Vincents in attendance. Having installed a regular timed breather recently my oil consumption was negligible with not a trace of a leak anywhere and almost no oil out of the breather - so nice to come out in the morning to an oil tight, clean ground bike. What as observed, however, was that when the motor was under load a significant and constant stream of white to light grey vapour was being emitted from the breather outlet. I should add that over the 5 days I covered just over 1,100 miles at an overall average speed of 52 mph (with a once off GPS max of 77 mph). I also noticed a slight lack (loss) of power on long hills. Today I decided I must investigate so strip and pulled the head and barrel only to find that at some point the front of the piston had "nipped up" resulting in the metal between the top of the piston and the first compression ring having been lost over about a 5 degree arc of the piston. The top ring was jammed in its slot as was the second compression ring. And there are two parallel score marks in the liner - quite severe - I am definitely up for a new piston and quite likely a new liner as well. Bugger. But better found now in my workshop than stuck out on the road somewhere! At least I have something to keep me occupied till the next planned trip (again of around 1,000 miles) next month. Martyn [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Oil Use
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