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CB750 Barn find project - First Timer
Underdog1:
Well... found the kickstart problem.
Kickstart gear installed incorrectly. Seems to have been able to run the oil pump fine but when kickstarting it has caused this arm to hit the casing and do the above damage.
I’m not an expert (durh, that’s why this happened) so unsure of the best course of action. Does his need repairing or is it even possible to repair? The bit that’s broken off isn’t full thickness so there’s still a divot there for the spring to sit in
philward:
Glad you found that - not just for solving the kickstart issue but dread to think what that chunk getting stuck in the gertrin would do
Trigger:
Something wrong there, you should not be able to move that spring with your finger and it should be under high tension against the case ;)
The roll pin needs to come out and it all needs to be rotated. If i get time later i will put one in to a case and show you how it should look.
SumpMagnet:
Anything ( well...within reason ) is repairable. That can be welded, but yoiu would want to take it to a specialist who understands what is needed and how to avoid distorting the cases.
My pop restores old Triumphs, and he has a regular welder who does wonders with smashed crankcases. Rod through the case....snapped chain torn through the gearbox....all possible. Not cheap...but in those cases, preserving an original set of crankcases is owrth the expense. Sometimes...it's not an option to replace as the parts are not readily available anywhere.
Couldn't say how important getting the metal replaced would be...but I definitely think that confirms you were right to pull the motor and find out hte cause, rather than just press on. A few marks in the frame paint are nothing compared to a ruined gearbox
Underdog1:
--- Quote from: Trigger on August 10, 2018, 08:15:41 PM ---Something wrong there, you should not be able to move that spring with your finger and it should be under high tension against the case ;)
The roll pin needs to come out and it all needs to be rotated. If i get time later i will put one in to a case and show you how it should look.
--- End quote ---
Yeah realised that as soon as I opened her up. That roll pin is a rascal, I’ve had it out once before and probably gave it a hefty tap back into place, doesn’t want to come out this time. Spend 30 minutes applying heat and pulling on it with pliers but no luck yet. Anyone got any tips?
Discovered the downside to hondabonding gaskets. No doubt they would have been Uber leak proof but they’ve obviously all been ruined now. Anyone got a spare clutch and gearbox gasket they don’t need ;D
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