[borzwazie]

Or Geeto, whoever posts first.

I just picked up a 78 CB750F, doesn't have a good exhaust on it, so I need one, or at least a usable set of head pipes. What other model year exhausts will fit on this? Will a 73 CB750E exhaust fit? I assume that 79 and later (DOHC) won't fit...

If anyone has anything ugly but usable that they'd like to get rid of, let me know. I'm just going to hit it with grill paint anyway.

 

[Geeto67]

first off there are no "e" bikes. K, F, A.

There are two styles of exhaust mount at the head: the K style uses two screws to hold a crush clamp that wraps around the exhaust pipe and holds it in place. The F style uses studs to hold a collar in place and uses shell type pieces to put tension on the header flange.

Stock K bike headers usually have too small a flange to use the F mounting menthod, so you will need to convert to the K method. However the rear exhaust mount locations are different. Plus the K exhaust don't have head pipes - they are one solid pipe from muffler to flange (and there are 4 of them). Stock K bike 4 into 1s are also very expensive.

The majority of aftermarket exhausts use the F mounting method and usually required K owners to convert. However the rear mount is always the issue.

For just headpipes, the 1975-78 cb750 exhaust should work. If using a 75-76 headpipe it may not clear the F oil filter unless you remove the extra "cooling" collar the 1978 bikes have (you will need a different oil filter bolt). Same goes for aftermarket exhausts. I am pretty sure any Mac headpipe will work (just find somebody's used cheap one) it is the muffler mounting tabs that work differently.

 

[bmartin]

I am going to a MC junk yard tonight - I can look for that year bike exhaust if your interested. I'll post in this thread what available.

 

[borzwazie]

Absolutely I'm interested - if you can find a solid 4-into-1, that would be very cool, but really, anything solid would be great.

 

[Geeto67]

good luck finding a nice stock 1978 cb750 muffler - every one of them rots out fairly early. My 6000 mile 78F was in mint shape except for the trashed stock muffler.

 

[borzwazie]

Oh, I don't care about stock - old MAC and Kerker are fine.

I'm still super pissed the guy cut a perfectly good set up - he could have financed his whole project with them.

 

[bmartin]

Borz - Does the 78 cb750F use 4 into 2 ???

 

[borzwazie]

No, it uses 4 into 1. According to Geeto, the K exhaust will work if I mount the K spigots, tho. Maybe that's an aftermarket pipe set?