Hows about the idler gear? If it is getting sloppy on its shaft, it may be rubbing on the clutch cage, causing the whirr and engine stop.

Ride on
Brewster

 

The 'whirr' doesn't create an engine stall. It just occurs for a few seconds after letting off the throttle and slowing (clutch out, in gear, any gear). It seems to go away or become much quieter when the bike is warmed up.

The clunk-stop has only happened 2 or 3 times, was more than a month ago, and isn't something I've been able to purposely recreate. As I was thinking about it more, the bike may not have been in neutral, but instead in gear with the clutch lever pulled in. Idle could have been low.

I'll try turning the engine over to listen for ACR, and check the idler gear.

 

The "whir" noise you hear any chance it's your timimng chain as I went to the Krieger tensioner and my bike lost the 5K clatter but makes a "whir" until the engine is warm and then all is right with the world.

 

I have the Krieger. That could be a possibility and I could make an adjustment (probably loosen it a little) and see what happens. That's easy.

 

If it is the tensioner you maybe fine on the adjustment as from what I understand it will be noticable when cold but as it warms the noise goes away.

 

Agreed, but I want to know what it is as I'm not really interested in a catastrophe.

 

For what it's worth, my bike has a whirrr sound in first and second gear when coasting with the clutch disengaged.

Most noticeable when slowing down for a red light.

 

Thought about this a little more. Can't be the tensioner. If I immediately pull in the clutch lever and let the engine slow, or rev it, the whirr doesn't change at all. It seems I should be looking at the idler gear first. Thanks all for replies.

 

Forget about the whirr, mine has it! I think it is the chain running over the rubber pad on the rear wheel support from the frame.

 

On the 'whir', just check there isn't a kink in the front brake hose plastic sheath, or you handlebars aren't restricting the upward movement of the hose when you brake. Mine did this when I moved my GPS cradle, it put a kink in the hoses plastic cover and when i slowed or braked, it 'whired' when it rubbed on the front tyre.