Custom exhaust for Zongshen engine - Question

[HotTommy]

I want to build a custom exhaust system for my 200cc Zongshen ATV engine. I started searching for the correct exhaust flange about and hour ago and have come up empty. The outlet on the engine appears to be for a 1.5" id / 1.625" od pipe secured by a two hole flange with bolts about 2-1/8" (58mm) apart. I'm very surprised that I can't find a flange with those dimensions. I'd appreciate guidance from anyone who can point me in the right direction.

[Aussie_in_MO]

Probably simplest to start with something close enough and massage things with a file or die grinder. These are pretty close and you get a pair to work with (for when your projects go like mine and things get messed up)
FORTLUFT Exhaust Flange Connection Kit (Mild Steel, 1.50''/38mm)

Alternatively, you could cut the existing flange off your current exhaust then clean it up and reuse?

[HotTommy]

Thanks for the quick reply. . . This project is from scratch so there is no old exhaust system. I could modify the part you referenced if needed. But I'm surprised that no one offers the correct flange given the number of these engines out there.

[Aussie_in_MO]

If you've got access to an angle grinder, bench vice, and drill press you can fab up a custom flange pretty quickly from a piece of flatbar (even Lowes mild steel would work).
Bolt holes can be drilled by hand but I find a drill press works better for running a hole saw to cut the inner hole.
I've made several 3" two bolt flanges for various Subaru Impreza projects over the years. Create a pattern out of thin cardboard (manila folder or cereal box) transfer that to the steel with a sharpie, then cut away.

[HotTommy]

I think I found what I want. Instead of searching by dimensions I searched for an old Honda flange. That yielded this finned flange of the correct dimensions.

[Aussie_in_MO]

Those are typically used on pipes that have a lip on the end similar to this old CB750K pipe.

[HotTommy]

Yeah, I may just buy a Honda CG125 exhaust pipe and work from there.