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SOHC.co.uk Forums => CB750 => Topic started by: martin_uk on June 03, 2023, 12:03:57 PM

Title: 530 chain on late CB750F1/K7/F2 output shaft
Post by: martin_uk on June 03, 2023, 12:03:57 PM

Hi Guys
Hope someone has come across this before.

My 1978 F1 has the gearbox output shaft with end bolt to retain sprocket rather than the locking plate and 2 bolts.

I know the K7/K8 and F2 had an increased size 630 chain which was heavy and overkill.

I have fitted a 530 chain, but the standard 530 sprocket is 12.7 wide and leaves a gap on end of shaft.

Im look for a 17t 530 sprocket that is 10.7 wide.

Spoke to DS and they can only supply a standard  K7/F2 630 sprocket

Has any one encountered this and know of a supplier?

Thanks

Martin

Title: Re: 530 chain on late CB750F1/K7/F2 output shaft
Post by: martin_uk on June 03, 2023, 02:56:54 PM

I found this incase it helps others, https://www.cb750.com/threads/78-cb750-f2-chain-conversion.7213/ (https://www.cb750.com/threads/78-cb750-f2-chain-conversion.7213/)

Apparently K7/F2 output shaft is 10mm further out and cover is different.

Title: Re: 530 chain on late CB750F1/K7/F2 output shaft
Post by: martin_uk on June 03, 2023, 03:08:24 PM

A 79 CB650 sprocket apparently fits using a 530 chain and is 10.7 wide so have ordered one and will see how it fits.

Title: Re: 530 chain on late CB750F1/K7/F2 output shaft
Post by: martin_uk on June 08, 2023, 03:59:14 PM

The sprocket JTF338 17 fits fine and does not overhang end of shaft.

I fitted with flange outwards which lined up teeth with rear sprocket