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General Chat (Vincent Related)
comet with unmarked timing gear
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<blockquote data-quote="alscomet" data-source="post: 1762" data-attributes="member: 260"><p>If anyone remembers my previous thread from a week ago I just want to post an update,can i have some comments please if i have done anything wrong.</p><p> I took my comet to the Bawtry meeting and it seemed to be running worse than before,hard to start and fuel coming out of the carb when running and overheating badly,got there and back(just)spoke to a guy called Rod Hornsby</p><p>who i think has pinpointed the problem.When i got back i stripped off the timing side,put my Dial gauge on and here are the readings.Inlet opening 70deg BTDC</p><p>inlet closed 40Deg ABDC Exhaust opens 98deg BBDC ex closes 3deg ATDC.</p><p> I think the cam shaft is moving on the cam wheel ever so slightly every time i use the bike. I have spot welded the cam to the wheel on the outside and reset the valve clearances to 41degBTDC inlet opens,69degADBC inlet closes and the exhaust has followed suit.the lift on the inlet cam is .28" and the exhaust cam lift</p><p>is .3" there are no marks on the cam so i am not sure what it is. the bike runs and starts ok but i havent tried it on the road yet. do i need a new camshaft complete or does it sound like a problem fix. alan</p></blockquote><p></p>
[QUOTE="alscomet, post: 1762, member: 260"] If anyone remembers my previous thread from a week ago I just want to post an update,can i have some comments please if i have done anything wrong. I took my comet to the Bawtry meeting and it seemed to be running worse than before,hard to start and fuel coming out of the carb when running and overheating badly,got there and back(just)spoke to a guy called Rod Hornsby who i think has pinpointed the problem.When i got back i stripped off the timing side,put my Dial gauge on and here are the readings.Inlet opening 70deg BTDC inlet closed 40Deg ABDC Exhaust opens 98deg BBDC ex closes 3deg ATDC. I think the cam shaft is moving on the cam wheel ever so slightly every time i use the bike. I have spot welded the cam to the wheel on the outside and reset the valve clearances to 41degBTDC inlet opens,69degADBC inlet closes and the exhaust has followed suit.the lift on the inlet cam is .28" and the exhaust cam lift is .3" there are no marks on the cam so i am not sure what it is. the bike runs and starts ok but i havent tried it on the road yet. do i need a new camshaft complete or does it sound like a problem fix. alan [/QUOTE]
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comet with unmarked timing gear
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