SOHC.co.uk Forums > CB750

Crunching gears

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UK Pete:
What makes a bike crunch when you put it in first gear?
When i am sitting at lights with other bikes then every one senses the lights are about to change , all you here is a load of almighty crunching where people are selecting first gear.
I think Honda is the worst just by way of observation and that any honda i own does it
Having just got my F2 back together and giving it a few runs around the block i have noticed with mine a big crunch when selecting first, its probably the worst i have had on a bike and it is the same for my K1 both of them do it bad, the clutch is working really good on the F2 no drag whatsoever so is it just bad design, i find my Kawasaki's dont do it so much but my Yamaha FZ1 does but only when hot.

OH yes the F2 is on its way to the MOT station in an hours time , fingers crossed
Pete

SteveD CB500K0:
Motorcycle gearboxes don't have synchromesh.

Spitfire:
Clutch adjustment maybe ?

Den

florence:
I agree with Steve about the syncromesh.  When your bike is stationary the gears you are bringing together are not running at the same speed as one another.  The only way you could eliminate the crunch would be on a rolling start when you would have a chance at matching the engine speed with the speed of the wheels.  I have been forced to do this on a number of occasions when my clutch cable has broken.  With practice, you will find that, providing you get the revs right, it is not necessay to use a clutch at all on any vehicle as long as you do not need to do a hill start!

SteveD CB500K0:
Modern bikes do it too.  It doesn't matter how expensive they are!

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