Topic: 1975 cb750A exhaust question.

[BenelliSEI]

I just fitted a really clean, 4-1, stock set of chrome pipes on my 1975 cb750F. A local enthusiast has an equally nice, single muffler from a cb750A. In the photos he’s sent me, it looks the same as what I need. Are these mufflers identical? Has anyone interchanged them?

[raymond10078]

I really can't help you - the only thought is that if they were identical, they'd have the same part numbers, which they do not.   

[BenelliSEI]

Raymond....... you are probably correct. I picked it up today, because in the pictures he sent it looked identical. The guy was adamant it came from a cb750A, BUT it’s clearly stamped “CB750F XXXXX”. I quickly paid up and headed home! I’ll try and fit it tomorrow and report back........

[sammon287]

Now to muddy the waters: the muffler from my '76 750A is clearly stamped "HMCB750F HM393 HONDA". It also has "SANKEI 2017" stamped on it. I know the header is unique to the A model due to oil pan and torque converter clearance, but I'm not sure if the muffler is shared. I could use a muffler in better condition.

[BenelliSEI]

Sammon..... The muffler I bought was stamped the same as yours. The seller told me it came from and “A”. Seems like Honda used them on BOTH. It fit perfectly on my ‘75F.

[sammon287]

Good to know. I had to pry the three tabs out around the graphite gasket/seal to split it from the header and there are some small rust holes forming on the bottom of the can. I had the rough looking header blasted and ceramic coated already, so I'm committed to using it, and will try to re-use the muffler unless I can find a better replacement. 

[sammon287]

I just clicked on the photos above to check it out more closely. Where did you find a brand new 1975 Honda? Well done. It makes my engine only restoration and cleaning of everything else look like hot garbage.

[BenelliSEI]

Thanks! I bought it a few years ago, from a guy that ran out of steam. He’d started with a bare frame, rebuilt the engine and did a lot of excellent work. Paint on the thank and frame were done by the best shop around here, and is really spectacular. I went all in and built new wheels, new wiring harness, tires, brakes, and electronic ignition. Recovered the seat and recently pulled a stainless Hindle exhaust system off the bike for my Rickman project. I found a really nice set of original head pipes on this forum, then stumbled on the muffler. It really is a gorgeous bike and pretty much “new”......