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This shaft goes through the rocker arms, and is supported by the aluminum "cam towers". Every year SOHC CB750 had these shafts, earlier years were slightly different in design. Let me know.

SOHC.....78

Longer of the two rocker shafts, intake.

1978 CB750 F3. Want to buy a usuable condition Intake Rocker Shaft. (Intake is longer than Exhaust side) Must not have any score or wear marks, service limit is 11.94mm (.4701") This is the later style with the hourglass center groove, and oil catch grooves where the rocker arms ride. I can...

I matched up 2 in-spec cyilnders, and 2 in-spec pistons. Won't have to get pistons after all!

Is there anyone that built a 350 engine that can advise me on pistons?

I finally got around to measuring both my original CL350 engine and the spare CB350 engine. I honed the cylinder before taking measurements, to remove rust and also to take note of any out-of-round spots. There was a cracked cylinder in the CL, which was a result of BEATING the seized pistons...

I wore myself out beating the piston that was seized. Unfortunately the spare CB350 engine was seized as well. It had to be driven out as well.

Nice find! Another cool, small displacement bike.

I did see that. A guy did it on a BSA engine that had been sitting for 40 something years. I figure the slow, uncompressed burn of the fluid will not harm the engine. Another trick I want to try is smack the piston with a wooden dowel or hammer handle. Gently of course.

Excellent build! DFW scene rocks! See you at Mods v. Rockers in 2012?

Thanks, Rich. I did penetrant oil, ATF, Acetone, and Engine oil. (at different times) It's pretty dang seized. I took the top "acorn" nuts off the top of the valve cover, and then cranked the generator bolt. The pistons are seized so much that is was actually lifting the cylinders/head off...

Kick starter doesn't move at all. I managed to break the bolt that holds the generator in place. Looks like I'm pulling the complete engine now! Here's a visual aid of the complete bike.

That's my next step, remove the cover to look for any loose objects. Shouldn't the gear stay in place when the starter is removed?

Here's a close look.

I got a complete 1969 CL350 with a seized engine. I need some input from CL/CB twin gurus. It had been sitting for an unknown number of years, so I figured the pistons were seized in the cylinders. I haven't ruled that out. I removed the starter just to see if it was maybe stuck, causing the...

David S. Fort Worth, TX BMW (auto) Technician / Home garage Honda builder 27 Rides: 78 CB750F ("super sport"). In the past I had a 1965 Honda S65, and a 1979 CB125s.

David here, I live in the North Fort Worth/Keller area. Stoked to see so many other Fort Worth riders here! "Where the West begins.." Had a 79 CB125S I rode to Mods v Rockers. Now I have this 78 CB750F. Anyone ever head up to Ozzie Rabbit Lodge on Lancaster (off 820)? Me and a few other moto...

You can see a few changes between the first and second pics (before and after). I chopped and lowered the seat. Shortened the overall length about 2 inches. Then took out material for a lower/sleeker seat cushion. It probably needs rearsets with the low clubman bars, or handlebars that are...

I've posted this on Forums.SOHC4.net , but not here yet. It's my 1978 CB750F.