1973 400 Cross - Frame And Piston

First time posting on here. Anyone seen a frame mod and a piston like this before? Hope you can see the photos. It was originally a Motorcorp West bike. Shipped in late 73.

That was frame mod done to increase rear wheel travel. Many 74 and earlier bikes were done like that back in the mid 70's. That piston mod was probably done to use with a reed valve kit as the 73 Huskys were originally piston port motors. GEM was a popular aftermarket reed valve kit back then. Looks like the cylinder has a reed valve kit installed. Looks like a fun project!

Marty

Thanks. The engine is rebuilt and sounds great. The frame was bent so that had to be fixed. It had a right whack at some point.

Welcome to Cafe Husky - Lots of knowledgeable members here.

motomwo is right - that looks like a G.E.M. reed valve. The piston looks rather different for a reed install. How does / did it run?

It almost runs/sounds like a fuel injected bike. I’ve tried to upload a clip but can’t seem to do it. Only one piston ring as well.

a simple way to do it is create a video, Rumble or youtube, there are photo ads you can upload videos to also, then post a link

Almost finished