SOHC.co.uk Forums > CB500/550
1975 CB500K1 crank rotation resistance
Bryanj:
Can normally tyrn by hand WITH pistons fitted
McCabe-Thiele (Ted):
On both my 400 & 500 I could rotate the crank by hand easily using the alternator rotor as a grip point.
It probably depends on your grip strength in my case it was not as easy with the pistons in place though it was easy to rock it through what I call the null pont.
martin_uk:
Thanks for comments and suggestions.
I have come to conclusion that need to take apart and check further.
A friend has offered use of surface plate and V blocks to check crank main journal run out.
The engine was apart a long time and moved around by PO so crank may have been dropped and bent :(
McCabe-Thiele (Ted):
I hold the view (probably wrongly) that cranks are not easy to bend when out of the engine.
I have always believed that a bent crank is generally associated with some sort of catastrophic engine failure such as a con rod tries to exit the block or casing.
Best of luck with finding the problem please keep us posted.
Laverda Dave:
Could a crank be damaged if the bike is dropped at high speed on the left (alternator) end? How many bikes did we see back in the day with chamfered alternator cases!
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version