SOHC.co.uk Forums > CB500/550

1975 CB500K1 crank rotation resistance

<< < (4/4)

Bryanj:
Yes they can, and were, back in the day we had one with a bent crank and taking the chance that it was maleable cast we had an approx 9 inch long bar turned so that an internal taper locked to the crank with an ht allen screw then carefull "whacked" the end with large hammer whilst clocking the bar on a turned portion concentric to the taper.
We got it to within 1 thou of concentric and the engine ran fine for as long as we had records of it(years)

martin_uk:
Its apart again.

Checked crankcases for distortion and found that approx 6 thou out at no.1 main journal housing face of upper case.

There is a lever mark on the inside face of alternator rotor and had not been removed by PO.

It came off fine with threaded bar screwed in to end.

Wondering if PO levered a bit too hard on case.

I am also going to check the mains run out with V blocks and surface plate.

Any experience of crankcase face distortion?

Bryanj:
Sounds like somebody didnt find the hidden bolt(s)
I may have some cases with crank, not sure

McCabe-Thiele (Ted):
That's a real pain - at least you have found the issue.

Navigation

[0] Message Index

[*] Previous page