Topic: CB750 exhaust collar question

[OrganDonor]

I've recently bought a 76 750 F that has a 4 into 4 original exhaust.  The PO had taken everything (and I mean everything) apart and I got a truckbed-o-parts which was amazingly complete but was lacking the collars to connect the exhaust to the engine.  This bike doesn't have studs normally associated with the exhaust ports, and I assume it uses the clamp style collars?  I've never dealt with these before. 

Is there simply a seal that works with the clamp to connect the exhaust, or does it somehow use the half-rings used on the stud-style collars?  The manual only shows a diagram for the stud-mounted collars, and I'm clueless as to the parts I need to get these connected.

[RustyJC]

My 1971 750K1 has stub pipes protruding from the cylinder head that the individual exhaust pipes slip over.  These are then clamped down by the clamp-style collars.  No seals or anything else are used.

Rusty

[madmtnmotors]

The stock exhaust on my 76 CB750F is a 4 into 1.

[754]

madmtn, is yours studs or ring clamp?
 Not sure what it should have, sometimes th  they get changed to fit the other style because they happen upon a set of pipes.
 Do you have the 2 studs, or the spigots (tubes) on the head ?

[Kickstart]

The 75/76 CB750F's have studs sticking out - just like the other SOHC CB750's.  In addition to the finned clamp/fitting, there are two half round collars, and one copper gasket - fastening/sealing each header pipe to the head.

Also, as madmtnmotors pointed out, stock on the F's (supersport) was 4-into-1.

I'm not familiar with aftermarket exhaust mounting, so I'm not sure how it would work with what you have... sorry

[RustyJC]

The 75/76 CB750F's have studs sticking out - just like the other SOHC CB750's.

Hmmm.....no studs on a 1971 CB750K1.  Just stub pipes.  I'm not sure what year the changeover was made, but they're not all the same.

Rusty

[madmtnmotors]

Mine uses two studs per pipe to mount the pipe to the head as shown on the attached image.

[ekpent]

The studs can be put into a k head replacing the screws that held the exhuast spigot.Good way to mount up aftermarker 4-1 exhaust systems.

[754]

All models switched to the 2 studs in 77 and 78.
 I was not sure about the first 2 years of F's. which has been confirmed.
 Now we only got to find out about the A , I think they had studs.

[Kickstart]

My 1971 750K1 has stub pipes protruding from the cylinder head that the individual exhaust pipes slip over.  These are then clamped down by the clamp-style collars.  No seals or anything else are used.

Rusty

Oh... thanks for the correction.  I made an assumption that this was standard for all the bikes. 

so, yeah, I knew better than to assume  Benny Hill tells us not to "assume"