Problem whilst fitting new sprockets.

[jasper090]

Hi,

I just bought some standard size front and rear sprockets plus chain to go onto my gilera rcr 50 as the old ones were worn.

However when I came to fit the front one, I encountered some issues. The washer that goes onto the castellated/corrugated drive knob (sorry I dont know the real name) after the sprocket, has the holes in the wrong place - on the sprocket that i took off, there were 4 threaded holes which the washer thing's two holes lined up with. The new sprocket has only two holes and they are approximately 2mm closer into the centre. I shall upload some pictures to so that you can understand me clearer (I realise that my explanation is difficult to understand!).

I've looked for new washers however i cannot find any.

Anyone have any ideas on what i should do?

Thanks,

Jasper

[murp24]

Bit cunfused but is it after market (replica) or standard NOS (new old stock) parts? If its after market it could be that they are the right size but been made on the cheap and not correct or simply just new and advertised wrong or even just been suplied with wrong washers, you could contact the seller or dealer and say they supplied wrong washers and they might send you a replacement and if they are the same it might just be dodgy parts if not and correct, jobs a good one! Sorry not much help, just what i think might be the problem.

[eastanglianbiker]

i think you mean the locking washer and it has 2 holes in it for bolts to go through into the sprocket locking it onto the output shaft it should be a direct swap or if not the new kit should of had a locking washer in it to fit the sprocket supplied

[pointblank0]

Can you not use the old washer?

[megawatt]

Talk to the supplier and get em to send the correct front sprocket?

[jasper090]

Its an after market afam sprocket set (I was told they are a good make). Yes it the locking washer. and one did not come with the new set so I need to use the old one. If i cannot get the old one to fit and cannot find a new one anywhere, does anyone know of a place where i can get a correct size one machined up?

[megawatt]

AFAM are good sprockets, but they should have sent you one that will fit to your bike. They haven't , so talk to them ???

[jasper090]

Right it turns out that the locking washer and the old sprocket that was on my bike originally was 28mm which is for bikes upto 2006, so what has probably happened is my bike was built pre 2008 (as the number plate says) but was registered in 2008 so the parts on the bike are actually pre 2006. So what i have decided to do is drill out two new holes and then tap them to the right size.

[argentum40]

hang on... why wont the firm you got the sprocket off change it for the correct one for your bike?... any firm worth their salt would do it no problem... theres no way i would be drilling a sprocket to fit.... firstly the steel is extremely hard and frankly i just dont see why you should have to

[eastanglianbiker]

just ring them up and explain whats happened they will be willing to exchange the sprocket for you far safer than trying to redrill the sprocket

[jasper090]

The place where i got the sprocket from have only a larger tooth sprocket in stock, so it would mean i would have to wait for then to get a new one in and frankly i am impatient and cannot be fussed to wait. I will soften the steel then drill+tap it and then harded it again. if it goes tits up, I shall just get the correct size sprocket and learn a lesson .