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British Bikes / Re: Norton Rigid Frame With Curved Top Tube
« on: August 02, 2009, 09:06:10 PM »
I've discovered the answer today - rigid cradle frames for ohv were curved, and for ohc were straight.
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British Bikes / Norton Rigid Frame With Curved Top Tube
« on: August 01, 2009, 10:27:50 PM »
Can anyone tell me the years that the Norton rigid frame with the curved top tube was produced? I have a 1936-1938 parts list which shows a straight tube.
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British Bikes / Re: Norton single oil burning problem - help!
« on: July 31, 2009, 09:50:47 PM »
I never thought that it wouldn't have a valve... oops. The bike is a bitsa and has an inter oil tank, and the return to the tank may not be quite as good as I thought. Maybe there is an in-line screen of some kind on the return which is clogged. I just don't understand why it was smoking badly then stopped then started again..
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British Bikes / Norton single oil burning problem - help!
« on: July 31, 2009, 08:41:05 PM »
New member - first post. Hello all.
I've got a bike with a Norton Model 50 engine, great compression, runs like a watch, but sometimes the engine smokes really badly, and then sometimes it doesn't smoke at all. I took the crankcase drain plug out immediately after a run and about a quarter of a pint or more of oil came out. I know the non return valve needs looking at, as the oil drains from the tank when the bike is stood, but I would have thought that the scavenge side of the pump would keep the cases empty when the bike is running. Oil returning to the tank seems to be fine and has a good flow.
I'm hoping that this oil in the crankcase could be the cause of the smoke. Any remedies, advice or opinions would be gratefully accepted.
I've got a bike with a Norton Model 50 engine, great compression, runs like a watch, but sometimes the engine smokes really badly, and then sometimes it doesn't smoke at all. I took the crankcase drain plug out immediately after a run and about a quarter of a pint or more of oil came out. I know the non return valve needs looking at, as the oil drains from the tank when the bike is stood, but I would have thought that the scavenge side of the pump would keep the cases empty when the bike is running. Oil returning to the tank seems to be fine and has a good flow.
I'm hoping that this oil in the crankcase could be the cause of the smoke. Any remedies, advice or opinions would be gratefully accepted.
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