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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="Matty" data-source="post: 95747" data-attributes="member: 1339"><p>If it does not rattle it doesn't go they say. Mine is not too bad and I think the racket is mostly a bit of slack in the steel timing gears which have been set up as well as is reasonably possible but give no trouble.</p><p>If you care to look on the forum about oil consumption you will find that I have been fighting a 150 mile to the pint problem on and off for the last 40 years - worrying about porous head, duff valve guides, glazed bore etc. The different oils I have tried did not seem to make any difference and the checks were quite thorough because I do over 3000 miles in an average year on the Comet, and have settled on Morris Classic 20/50.</p><p>Rebores, low expansion pistons, new standard valve guides, blocking the oil feed to the back of the bore, deglazing the bore etc did not seem to help over the years-and the engine has only sometimes ever leaked a small spot of oil, though it did smoke from the exhaust on the overrun and the exhaust pipe was always oily and black inside.</p><p>However I had Conways fit valve guides with seals last year, and after a thorough cleaning of the head I attempted to fix any porosity by heating the head to 100deg C and painting it with a special very thin Loctite 290 which supposedly gets sucked into the porous parts as the head cools. I painted it inside the inlet and exhaust ports and on the area above the valve guides.</p><p>Blue smoke has gone and I now do 500+ miles per pint which will have to be good enough.</p><p>Matty</p></blockquote><p></p>
[QUOTE="Matty, post: 95747, member: 1339"] If it does not rattle it doesn't go they say. Mine is not too bad and I think the racket is mostly a bit of slack in the steel timing gears which have been set up as well as is reasonably possible but give no trouble. If you care to look on the forum about oil consumption you will find that I have been fighting a 150 mile to the pint problem on and off for the last 40 years - worrying about porous head, duff valve guides, glazed bore etc. The different oils I have tried did not seem to make any difference and the checks were quite thorough because I do over 3000 miles in an average year on the Comet, and have settled on Morris Classic 20/50. Rebores, low expansion pistons, new standard valve guides, blocking the oil feed to the back of the bore, deglazing the bore etc did not seem to help over the years-and the engine has only sometimes ever leaked a small spot of oil, though it did smoke from the exhaust on the overrun and the exhaust pipe was always oily and black inside. However I had Conways fit valve guides with seals last year, and after a thorough cleaning of the head I attempted to fix any porosity by heating the head to 100deg C and painting it with a special very thin Loctite 290 which supposedly gets sucked into the porous parts as the head cools. I painted it inside the inlet and exhaust ports and on the area above the valve guides. Blue smoke has gone and I now do 500+ miles per pint which will have to be good enough. Matty [/QUOTE]
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