SOHC.co.uk Forums > CB500/550
1975 CB500K1 crank rotation resistance
McCabe-Thiele (Ted):
A bit of a head scratcher - not trying do doubt your ability - are you sure when you fitted the main shells in the correct main bearing positions as number 1 main is then on your right when inverted.
Even so a tight clearance shell should not make it so resistant to rotation.
Bryanj:
Only thing i can think off is either something between case and shell or the disaster of a bent crank, i have built engines with all black shells with no rotational problems
martin_uk:
End float on crankshaft is approx 6 thou.
I did not check crank for run out as wear on shells was minimal.
McCabe-Thiele (Ted):
When you assembled the crankcase halves is it possible that an excess of Hondabond could have entered somewhere to lead to this problem? Could the crank seals be somehow causing the extra binding if they have distorted?
I'm assuming you have not fitted the block yet.
I think you will have to split the cases again to investigate further.
martin_uk:
--- Quote from: McCabe-Thiele (Ted) on May 03, 2024, 11:06:48 AM ---When you assembled the crankcase halves is it possible that an excess of Hondabond could have entered somewhere to lead to this problem? Could the crank seals be somehow causing the extra binding if they have distorted?
I'm assuming you have not fitted the block yet.
I think you will have to split the cases again to investigate further.
--- End quote ---
I have considered if the seals were the problem, but fitted well and tightening only happens on final torque of mains bolts.
I will try easing them off and re torquing.
You can turn the crank but do need a spanner on the alternator bolt.
Wondering if I am being too cautious.
Can you normally turn by hand on rotor without pistons fitted?
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