I have been looking for ever. My bike gets warm and as soon as I stop and pull In the clutch it’s 4,000 rpm and then slowly goes down. As soon as I take off it’s fine, it shifts fine and runs fine. I believe this is my problem.
I wouldn't think that is a advance problem. I would check the throttle cable first, it could be sticking slightly, it doesn't take a lot to keep the revs up. Then I would check for air leaks on the inlet side, maybe a split in one of the manifold rubbers or one of the clamps loose. I hope this helps you find your problem.
I had an airhead BMW and could tell when the gap needed adjusting by the way it ran. Have you thought about converting to electronic ignition? Surely there's a kit out there.
Ahh there's definitely CB750 electronic ignition kits out there, and to be honest I am planning to put one in at some point. But there's a certain enjoyment to getting these old points ignitions set up just right, so as long as the CB750 runs well, I won't rush to do the upgrade to electronic.
I'm not sure what you mean by points case. If you are saying part of the crankcase then that would be quite a big issue. Anything can be repaired and replaced, it is just the cost and time involved that would stop you. If you have damaged the crankcase then depending on what has happened to it you may be able get it repaired in situ, otherwise it is a full engine strip. Good luck.
It is a circuit tester! You take the timing marks from the backing plate of the points for TDC. If you clip the circuit tester to the spring on the points, and to a ground then it lights up when the points open. I hope that helps.
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I have been looking for ever. My bike gets warm and as soon as I stop and pull In the clutch it’s 4,000 rpm and then slowly goes down. As soon as I take off it’s fine, it shifts fine and runs fine. I believe this is my problem.
I wouldn't think that is a advance problem. I would check the throttle cable first, it could be sticking slightly, it doesn't take a lot to keep the revs up. Then I would check for air leaks on the inlet side, maybe a split in one of the manifold rubbers or one of the clamps loose. I hope this helps you find your problem.
I had an airhead BMW and could tell when the gap needed adjusting by the way it ran. Have you thought about converting to electronic ignition? Surely there's a kit out there.
Ahh there's definitely CB750 electronic ignition kits out there, and to be honest I am planning to put one in at some point.
But there's a certain enjoyment to getting these old points ignitions set up just right, so as long as the CB750 runs well, I won't rush to do the upgrade to electronic.
If I cracked the points case can it be replaced
I'm not sure what you mean by points case. If you are saying part of the crankcase then that would be quite a big issue. Anything can be repaired and replaced, it is just the cost and time involved that would stop you. If you have damaged the crankcase then depending on what has happened to it you may be able get it repaired in situ, otherwise it is a full engine strip. Good luck.
What tool are you using? The one with a light? Does it adjust the top dead center? Is that just a circuit tester?
It is a circuit tester! You take the timing marks from the backing plate of the points for TDC. If you clip the circuit tester to the spring on the points, and to a ground then it lights up when the points open. I hope that helps.
you forgot to grease the came.
Good point, must mention it next time.