Comets are very reiable if you ask me. They need to be set up correctly and with care. I have about 5000 miles on a recent rebuild. This includes as a ride to Montana and back from Vancouver BC approx. 2500KM. In the last two weeks commuting to work I have put on 300 miles.
As for the timing I use 34 degrees with a degree wheel. I set the timing like its written in Know thy Beast and the Vincent Service book. I can set it very accurately. I would suggest if you are having trouble timing have a friend assist on one side of the bike. I know its not easy setting the points gap and locking the ATD at the same time. Some people choose to use an aircraft magneto timing unit.
I have an Omega 8:1 piston with Total seal top piston ring (Good top rings are important) and Mark 1 cam. Lucas Magneto and Lucas Generator. All Standard Vincent stuff.
As for the timing I use 34 degrees with a degree wheel. I set the timing like its written in Know thy Beast and the Vincent Service book. I can set it very accurately. I would suggest if you are having trouble timing have a friend assist on one side of the bike. I know its not easy setting the points gap and locking the ATD at the same time. Some people choose to use an aircraft magneto timing unit.
I have an Omega 8:1 piston with Total seal top piston ring (Good top rings are important) and Mark 1 cam. Lucas Magneto and Lucas Generator. All Standard Vincent stuff.
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