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I think I can work with this plenum length: https://www.exx.se/techinfo/runners/runners.html I am assuming the GS850 pistons and using the shorter calculated length (294mm). I measure 84mm from the flange to the valve seat, 64.5mm for the plenum (centerline), and 118 for the carb body...

Here is a mockup of the plenums with a Weber DCOE. I added ports for 1/4in hose barb fittings - primarily for measuring vacuum, but secondarily for running a balance tube to soften the intake pulses. For the plenum lengths (50mm + 7mm per flange) I sorta licked my finger and stuck it in the...

Just found "Common Motor Collective." Wow. What a resource. Lots of parts with reasonable prices. Digital downloads of service manuals: https://www.common-motor.com/manuals#CB360

I owned a Honda, Toyota, and Subaru at the same time. I do all of my own wrenching. The Subaru was junk. Wasn't designed to be repaired... a disposable car (so I got rid of it). The Honda is mostly reliable, works well for what it does, but lacks the refinement and efficiency of the Toyota...

Here are some renderings of the plenums to adapt to the DCOE40. Larger side (closer together) is the carb side. 4 Degrees of downward tilt at the engine-side flange. Think I might include a boss in the casting to drill and add a port for taking vacuum measurements.

LOL... yeah, but the Webers are complicated in such a sexy way. :) When I look at Honda's engineering from an engineering perspective, I see decisions stacked on top of decisions. Almost sedimentary. Rather than designing a new part to update an old one, they just add another modification to...

Thanks for the info. I'll look into boring it out.

Does anyone have engine specs for the 360? - Bore/Stroke - CC volume - quench (do the pistons zero-deck?) - piston displacement (or flat?) - Cam timing/lift/duration - Etc.

Last night I got deep into an idea of using a Weber DCOE 40. I learned I'm not the first to have this thought (Drixton). The Keihin 747 is a 28mm venturi, and so I should be able to set up the DCOE 40 with 28mm venturis for starters. It sure would be a cool aspect of the build. Started...

So, I'm thinking about making an intake manifold and going with a single carb with cone filter for simplicity of tuning. Thoughts? Any specific carb recommendation to feed both cylinders? Also, been thinking that this motor will likely get a complete rebuild. What performance upgrades are...

Bought 'em for $115 delivered. I think they'll clean up good enough.

So these CB360 pipes should be a direct fit?

Now that I am a few days into disassembly, I have to say that the 1980 Suzuki GN400 is much easier to work on. It only took me a couple hours to completely strip the Suzuki down to the frame. Observations: 1. Much simpler design of everything. The Honda parts seem overly complicated in...

Let me know if anyone is interested in parts. I am pretty much only keeping the frame, engine, forks, and wheels (maybe). I have started listing everything else on Ebay or Marketplace.

Got it. Cut the ring then sliced the muffler sleeve so it would release from the pipe. Pipe came out good except for a small cut in the flange under the retaining ring.

Are the CB350 pipes compatible with the CL360 motor? There are plenty of cheap options on Ebay from Thailand for the CB350.

The muffler is toast, but I want to preserve the pipe.

What kind of joint is this on the exhaust pipe? How can I separate the muffler from the header pipe?

Thanks for the link. I was looking at the Airtech fairings, but didn't see the tanks.

Good point... I'll give this some consideration. Or maybe I'll marry the ideas and build something more suitable for daily riding, but use design cues and colors that are a tribute to the racing livery.