As I was reading this thread and tabbing down, I was thinking to myself "Well I should be okay with a stock crank on my old MKIII street bike" then I got down to your entry Martyn and you have a very good point. CjMatchless said:...... On the 850 the drive side mainshaft sheared as I shut off, after deciding not to do a risky over take. This is why I now use Mr Maneys finest in my bikes, as the consequences of a crank breaking could be fatal.......Martyn.
SteveA said:Surely the most important comment here is '30 MORE' races on a '40 year old' stock crank.
It was going to go sometime!
Or was it 'new stock'? at which point one questions the logic of a stock crank when alternatives are available.
acotrel said:Bad habits ?
acotrel said:Most of the kids I see doing that are going nowhere. It often happens when they are trying to go faster, but end up going slower. In the old days, with the tyres we had, it meant an early crash. As soon as the rear end moved, you were down. With modern tyres you get away with a lot more stupidity.
Snotzo said:At Beezagent blogspot/com see 'The Roland Pike Story', and in Chapter 22 of the Roland Pike Autobiography there is a description of how at BSA they overcame a problem with breaking of twin cylinder engine crankshafts by burnishing the crank radii.
Has such burnishing ever been applied to a Norton crank ? I know not, but perhaps someone who does can tell us .