Topic: 750 Chain and Sprokets question

[alltherightpills]

I'm helping a guy work on his frankenstein 750 ('71 750 motor in a '77 750F frame) that he just bought and he needs a new chain.  I don't know nothing bout no 750's, but the searching I've done so far tells me that the 77 and 78 750's ran a 630 chain, while the earlier models ran a 530 chain. 

So my question is should we swap the 630 rear sprocket for a 530 or should we swap the 530 front sprocket for a 630.  Are these just bolt on conversions or is there more work involved with one switching one of the sprockets over the other?

Thanks for your help...

[Johnny5]

The 530 chain route is much cheaper, so I would just convert everything to fit that size frame. The stock sprocket teeth are 18t front and 48t rear.

[754]

Change the rear sprocket carrier, or thin it, to get proper chain alignment with that engine frame combo.