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1971 Honda CB750 K1 - Can anyone ID these forks and wheels?

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Yamahawk:
Hi All,
   Recently acquired a 1971 CB750 K1, and it has a set of ComStar wheels and forks off of a different model CB750. I am thinking perhaps an early 80's CB750 DOHC, but would value any information about them. It looks like he swapped the whole front end, but it still has the handlebar top clamp with the idiot lights in it. I am not sure if he swapped the rear fender, also. I appreciate any input you may have on this bike. The ignition switch was 'butchered' into a keyed automotive type switch mounted behind the cylinders, too. Thanks!
Charlie

K2-K6:
Looks an odd mix of parts and I can't quite get enough resolution to see front caliper well.

Forks caliper and disc look something like original but with a Comstar that looks as you say like first iteration of the twin cam 750. If you give a straight shot of just front wheel caliper, forks and mudguard from bike's left it may let others see more detail.

Rear looks like a 17 inch which we didn't see on that same bike over here,  chainguard looks like SOHC 750 F2 of 1977 vintage.

Yamahawk:
It IS a mixture of parts, even the seat isn't stock. The rear wheel is a 17" and front is 19", glad the rear is 17", better tires available. I will go out in a bit and take a better picture of the front wheel/caliper/rotor. I'm thinking he bolted on a complete front end from an F2 or a CB750 Custom, as front fender also resembles later models... Thanks!
Charlie

K2-K6:
The first Comstar wheel fitted 750s that ive seen use a different lower fork tube with a prominent cast ridge down front and rear,  also looks like you've got the swinging pivot caliper as original type and not used on F2 onwards.

Some of the others on here are better able to identify if the caliper is from the original bike so those extra pictures will help with that.

Bryanj:
Front caliper is NOT f2, its a rear mixup and god knows where the bits came from, rear 17 inch could be K7/8

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