Author Topic: Another project bike, '78 CB750F (Read 3693 times)

capnspif · « **Reply #25 on:** November 29, 2006, 11:46:05 PM »

Quote from: rdub3017 on September 21, 2006, 03:16:37 PM

Capnspif - have you looked into any other swingarms or rear wheel setups for your bike? I am just curious if there is a "best" option on swingarm/rear wheel setups as far as sprockets lining up. I like the look of putting a newer streetbike swingarm and wheel on....plus better brakes

I didn't look around. Others seemed to have success with it so I just went with the CBR F3 set up. The swingarm is about 1-1.25" longer than the CB, so there's a slight increase in wheelbase. I didn't check the 600F2, it may have the same swingarm/wheel as the F3, but maybe the original 600 Hurricane would work better?

Mike

cben750f0 · « **Reply #26 on:** November 30, 2006, 01:15:08 AM »

man that loks great, here is a pick i found of the mono shock rear on a F1... dunno where i got it, or how its done, but looks way cool... peace

Geeto67 · « **Reply #27 on:** November 30, 2006, 04:46:54 AM »

Quote from: capnspif on September 18, 2006, 07:04:02 PM

The swingarm goes in pretty cleanly, I had to grind a few thousands off the inside of the frame to get clearance. The pivot bolt from the 750 is a couple mm smaller dia than the 600's, although the 600's is too short. I still need to find a bolt long enough at the right diameter, or get some steel rod and have it cut and threaded on the ends, then drill out the frame a mm or two. Other than that, welding on the shock mounts is the biggest PIA. The stock 600 wheel spacers work fine, tire is centered on the bike. Front sprocket offset is an issue but I'll have to get one machined up.

About the swingarm pivot - why don't you have a machine shop make you a shim that allows you to run the stock pivot bushings? Actually now that I think about it you can probably have a machine shop make you a new set of pivot bushings to fit the arm and take the bolt. Probably easier and safer than making your own pivot bolt.

capnspif · « **Reply #28 on:** November 30, 2006, 07:22:13 AM »

Quote from: Geeto67 on November 30, 2006, 04:46:54 AM

About the swingarm pivot - why don't you have a machine shop make you a shim that allows you to run the stock pivot bushings? Actually now that I think about it you can probably have a machine shop make you a new set of pivot bushings to fit the arm and take the bolt. Probably easier and safer than making your own pivot bolt.

That's probably what I'll end up doing, having bushings machined, I think there's 3 in the CBR swingarm. The guy who will do it could just as easily machine the larger bolt too.

Geeto67 · « **Reply #29 on:** November 30, 2006, 07:43:13 AM »

Quote from: capnspif on November 30, 2006, 07:22:13 AM

Quote from: Geeto67 on November 30, 2006, 04:46:54 AM
About the swingarm pivot - why don't you have a machine shop make you a shim that allows you to run the stock pivot bushings? Actually now that I think about it you can probably have a machine shop make you a new set of pivot bushings to fit the arm and take the bolt. Probably easier and safer than making your own pivot bolt.

That's probably what I'll end up doing, having bushings machined, I think there's 3 in the CBR swingarm. The guy who will do it could just as easily machine the larger bolt too.

Well my point with the bolt is that it needs to be a certain grade (like grade 8 ) - the swingarm busings are not stressed nearly as much as the bolt which is why there are brass replacements. The bolt takes cornering loads where as the bushings do not.