SOHC.co.uk Forums > CB750

Offset front sprocket

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Frankie 2 sheds:
Yes I have considered a 520 chain but I think I can only get the offset sprocket for 530. Thanks for the pic trigger. It looks do-able just but that is with the sprocket already in place. My engine is complete. So it goes back to the original question. Can you fit an offset sprocket on the shaft as is?? I have the same set up as your picture using an old bottom half and you can only just fit a standed sprocket on as my attached pic shows. I don't think for one minute that an 9.5mm offset sprocket can physically fit on the shaft without having to split the engine block, unless I'm missing something. Your thoughts please....Frank

Frankie 2 sheds:
I've just noticed that the bottom end I have in the frame is slightly different to my completed engine in that like your pic trigger the casing oppersite the drive shaft is rounded off with the bolt further back which might help. Now I'm totally confused

K2-K6:
It is kinda a catch 22,  can see reluctance to shell out if it's not going to fit.  Has the supplier any leeway to let you try?

On the 520 sizing, they only differ in thickness to the 530 as far as I know.

Sooooo, if you machined the back face of the teeth area only (nearest gearbox)  off a std sprocket to fit the 520,  then that moves chain centreline out.

Then machine a recess into the front face to allow the retaining plate to sit "in " the sprocket,  this would move the whole sprocket outwards also. 

The combined total may give you what you need,  bearing in mind that the rear sprocket in a 520 would bring the outer face inwards and so come closer to front alignment too.

Could the three shifts give you what you need?

Frankie 2 sheds:
Now that is what I call a brilliant idea. Just thinking outlound I don't think it will give me the full 10mm but what it will do is allow me to go the 520 route which brings the gsxr rear wheel into play as it is already at 520 and I would of had to go to a JT1800 530. Thanks K2 I'm off to play ;D ;D ;D

Frankie 2 sheds:
Problem solved I think. I have been using a bottom end engine pre 1977 as seen in earlier pic. Thankfully the engine that will eventually go in is 1978 pics attached. As you can see there is room to accomadate a 10mm offset socket. Talking to the supplier they have supplied 15mm before. They make any sprocket to order. So I will be ordering a 10mm x 520 offset. Thanks guys.....Frank

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