replacing the couterbalancer key on 00' 426

Ive had this nagging feeling ever since I heard about the soft keystock Yamaha used for the counterbalancer drive gear, I feel like its a ticking timebomb.

What do I need in order to replace this with some hardened stock?

Where can I get hardened stock and what size will be needed?

Feel free to give me any tips that may come in handy.

Thx

why not just replace it with a stock key? :thumbsup: either way you go your gonna have to replace it on a regular basis. i had to get a new crank cuz of that key, and i still think the stock key is best. but, i will use 2-3 stock keys a year. :devil:

dont you think they made the key soft like that for a reason? maybe instead of the keyway on the crank breaking, the key will compress and deform. to a point, of course.

ill use the stock key, they are $1 and easy to swap.

I actually dont have any problems right now (knock on wood) I'm just thinking about preventative maintenence. I've always believed the soft, stock keys were too soft and short for this use. But then again, I could be wrong :thumbsup:

I've replace mine on 2000 yz426 3 times now with the stock, it is not a big job at all and real inexpensive...you will know when it needs it, it makes a real clear rattle noise at idle... can be repalced in an hour or so.

can anyone show me what is the cb key? i mean in a diagram or something similar.

my '99yz400f is making a constant and loud ticking noise, which doesnt go away when you rev it and it may be that (as i read in various posts here) but i don't know what it is.

thanks in advance :thumbsup:

can anyone show me what is the cb key? i mean in a diagram or something similar.

my '99yz400f is making a constant and loud ticking noise, which doesnt go away when you rev it and it may be that (as i read in various posts here) but i don't know what it is.

thanks in advance :thumbsup:

part #18 under crank & piston

http://www.yamahaoftroy.com/fiche_section_detail.asp

Are U Guys Talking About The Key On The Crankshaft Or On The Counterbalance Shaft On 00 426???????

Actually, it's item #9. #18 is the flywheel key.

There was a TT'er who used to make his own keys by filing down a piece of oversized stock until it was a very snug fit. The theory was that the stock key fit too loosely and that that contributed to it being beat up so soon. It could just have been true for his bike, but it sounds reasonable.

is there a thread explaining with detail how to check/replace the key?

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