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CB750 early K with K7 combination...

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CR21:
Hi forum members! I am after a bit of advice. I have a lot of spare parts, and my friend wishes to build a cafe racer.

I have a K7 frame, K3 engine and swinging arm and wheels that he can use.

I have heard that the K7s chain alignment is slightly different to the earlier models, will this effect the above combination as he would be putting an early engine into a late frame?

Any help would be appreciated, I would rather he builds a cafe racer from bits rather than stripping a whole bike  ;)

Cheers
CR21

hairygit:
The chain alignment is down to the heavier (630) chain on K7 models, since the K7 motor is basically an F1 engine fitted with PD carbs as long as you use the K3 swingarm and wheel and sprockets there should be no problems.

Sent from my X6pro using Tapatalk

CR21:

--- Quote from: hairygit on May 03, 2017, 06:04:18 AM ---The chain alignment is down to the heavier (630) chain on K7 models, since the K7 motor is basically an F1 engine fitted with PD carbs as long as you use the K3 swingarm and wheel and sprockets there should be no problems.

Sent from my X6pro using Tapatalk

--- End quote ---

Thanks for the reply  :D

neilg:
Just to add on from this, will a F1 motor go straight into a K7 frame without any issues to chain alignment. I see the final drive shaft is a different part number so would this need swapping. Anyone know?

K2-K6:
Honda pair the K7 with the F2 and as far as I know they both use the 630 o-ring types chain as original equipment.

All the 750 engines, again as far as I'm aware, fit all of the frames with no mounting exceptions regarding alignment.

The sprocket output shaft is different for the F2/K7 as that bottom end uses a larger higher load bearing to take the expected increase in forces of a much bigger heavier final drive chain.

I don't think chain alignment is any different at all, just that they had to accommodate the extra chain width in the direction of going away from the rear tyre, if that makes sense. So fitting a 630 chain and sprockets gives the correct alignment for that kit.

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