Yamaha rear clutch noise

[Field6565]

I really can't see what is going on. You should have got a vid from idle to full throttle and back to idle. Hopefully the noise isn't coming from the trans.

[Mike Mac]

Doesn't sound like the motor is getting to high RPM. Thats why I'm saying start at primary clutch.

[nitro1]

Tomorrow I'll clean it up and take some pics and try the hearing trick, the noise is not all the time only when I get up to medium to high speed

[cgtech]

I think your bracket on top of engine (that rear of airbox bolts to) may be broken.

[nitro1]

Any help ? U can he a little clinking at the end of vid

https://www.youtube.com/watch?v=M9GJTYtMb_w

[cgtech]

Yes, i think the bracket on the top of the motor (where the rear of the airbox bolts to) may be broken and making all the noise. Also, have you tried removing the drive belt & run it to see if noise can happen without rear clutch spinning?

[Mike Mac]

I think thats a good call cg! Those brackets are not welded very well!!

[nitro1]

Do u guys have a picture of what the bracket looks like ? My air filter is on top of the engine right under the seat and I don't see any brackets ?

[nitro1]

And I removed the belt and the noise was gone

[Mike Mac]

You could have rear end damage. But I'd remove the air filter box and look at the rear bracket. I think (if I remember rite), it bolts to the starter. The welds are just tack welds, and fail easily.

Then if belt is off, turn tranny sheave by hand and feel for roughness, loose or something not right.

The bracket is in this pic. but a bit hard to recognize. It has 2 kinda large gold bolt heads in it. Just forward of the starter. If you look at the right end of the bracket, (close to the starter belt) you can see my weld (discoloration).