Topic: Exhaust Flanges & Ports

[Ellz10]

Can my '77 750 K use other types of flanges from earlier/later model years or am I stuck with the stock ones with the flared lip exhaust tips?

[newday777]

The K7,K8 head is basically the same in the exhaust ports as the K4-k6 so yes you can put the earlier flanges in.

[Ellz10]

The K7,K8 head is basically the same in the exhaust ports as the K4-k6 so yes you can put the earlier flanges in.

Thank you!

[robvangulik]

When I made a set of stainless headers for my CBR last century I found this the best way to make the flanges, no need for any loose metal parts anymore...

[Ellz10]

Can someone tell me what the OD is of the portion that is inserted into the flange (circled in red) for the earlier model K's?

[Tracksnblades1]

Pull one of your copper rings out of the head and measure it.

😁

[Ellz10]

Pull one of your copper rings out of the head and measure it.

😁

That wouldn't correlate at all. The part I circled goes over the outside flange.

[Ellz10]

The K7,K8 head is basically the same in the exhaust ports as the K4-k6 so yes you can put the earlier flanges in.

Well I went ahead and paid the $200 for a set of new K5 flanges and unless that gap is acceptable/normal, then the earlier flanges DO NOT work with the K7/K8 heads.......

And that gap is without the gasket in there..

Hopefully I can return them, but I doubt it since I opened one.

[Ellz10]

Can't return them.

Costly mistake - next time I'll get several opinions lol.