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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Blowing Out Blue Smoke after running slowly
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<blockquote data-quote="Matty" data-source="post: 27558" data-attributes="member: 1339"><p>My Comet had a new piston (VOC Low expansion Type) and liner about 3 years 9,000 miles ago. It had had the cylinder oiling hole drilled, though some people said afterwards this is not required.</p><p></p><p>It always seemed to have piston slap when cold, which I did not expect, but had allegedly been bored to the correct tighter clearances and seemed OK when I checked it. It is quiet when hot.</p><p></p><p>The exhaust valve guide was changed at the same time and the inlet looked fine so was left.</p><p></p><p>It runs fine but blows out quite a lot of blue smoke after running slowly but is clean when running on main roads, motorways etc.</p><p></p><p>The cylinder oil hole was drilled at an angle just below the lowest point reached by the scraper ring. Could this be in some way a cause of the oil use - which only seems to be about 500 miles per pint, but raises comments on the slow VMCC runs!!</p><p></p><p>Is it safe for me as an experiment to blank off the feed to the cylinder oil hole by sealing the feed to it from the timing cover to see if this cures the blue smoke problem please.</p><p></p><p>Matty</p></blockquote><p></p>
[QUOTE="Matty, post: 27558, member: 1339"] My Comet had a new piston (VOC Low expansion Type) and liner about 3 years 9,000 miles ago. It had had the cylinder oiling hole drilled, though some people said afterwards this is not required. It always seemed to have piston slap when cold, which I did not expect, but had allegedly been bored to the correct tighter clearances and seemed OK when I checked it. It is quiet when hot. The exhaust valve guide was changed at the same time and the inlet looked fine so was left. It runs fine but blows out quite a lot of blue smoke after running slowly but is clean when running on main roads, motorways etc. The cylinder oil hole was drilled at an angle just below the lowest point reached by the scraper ring. Could this be in some way a cause of the oil use - which only seems to be about 500 miles per pint, but raises comments on the slow VMCC runs!! Is it safe for me as an experiment to blank off the feed to the cylinder oil hole by sealing the feed to it from the timing cover to see if this cures the blue smoke problem please. Matty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Blowing Out Blue Smoke after running slowly
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