Sprocket lock help pleeaase

CroCCrip · L Plate Warrior Joined: 25 Jun 2004 Karma :

I have a 1991 FZR600 only 91 HP at the back wheel.... but STILL FUN TO RIDE!.... anyways i need help on something. I bought my bike about a month ago and during the first couple times i was riding it the front sprocket actually came off while i was riding, well i went up to my local bike shop and got the parts they said i would need to fix this problem. when they gave me the part it waz a washer and a nut that bolts down to hold the sprocket in place... well when i went to put it all back together there where no threads where the nut was supposed to bolt down i called the guy i bought the bike from and he said it wasnt a nut that holds it down he had put an aftermarket sprocket on it and he said it was some kind of "bent clip" whatever that means so thats where i need yalls advice what is this clip called and where can i find it!? please help thanks... Very Happy

Hex · Party Boy Joined: 04 Feb 2002 Karma :

Possibly a split pin or a circlip.

If theres a hole through the shaft its a split pin you want, and the pin goes through the hole and opens out at one end.

If theres a grove running round the shaft a circlip will clip in to this groove.

These are the only things I can think of off the top of my head at the mo.
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CroCCrip · L Plate Warrior Joined: 25 Jun 2004 Karma :

well where do i get one of those two things from.... thanks for the help Question

william · Nova Slayer Joined: 16 May 2004 Karma :

If the bikeshop knows its stuff they would have given you the correct parts.

An aftermarket sprocket would not alter the gearbox shaft.

I hope they were wrong otherwise where have the threads gone?

William

CroCCrip · L Plate Warrior Joined: 25 Jun 2004 Karma :

see but there is a grove running around the shaft where the sprocket goes and theres a hole in the end of the shaft so I'm not real sure what to do.... but i just don't see how the treads would just disappear...? thanks for you alls help... if anyone else knows anything please post Rolling Eyes

Guest · Brolly Dolly Joined: 22 Apr 2004 Karma :

Here's what it should look like - conventional tab washer (27) and nut (28)

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

This is not an uncommon problem with Yamahas. The problem is that the sprockets come off and then they wear away the thread on the output shaft from the gearbox. The result is that you cannot then bolt the sprocket in place properly.

There is not easy fix for this.

If you are really lucky then you can recut the thread. If you want to bodge it then you can weld the sprocket onto the shaft, but then you will not be able to change the front sprocket.

The only real fix is to strip the engine down and replace the output shaft from the gearbox.

All the best

Keith
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CroCCrip · L Plate Warrior Joined: 25 Jun 2004 Karma :

alright well i'm going to try a couple of the suggestions you all have given me thank you for all of your help i consider you all friends....

Chris