Hello, I am new to this forum and a fairly new can-am owner. Just a bit of background, I purchase a non running ds650 about 8 months ago from a guy that got it non running in a trade. Price was right, so I took a chance and bought it "blind" not knowing the history of the quad. Original issue was no spark, after chasing wires and a new cdi I got it running.

Fast forward to last week, it kicked back when starting and ended up shearing some teeth on the starter and double starter gear. Decided to go through the top end and make sure all was good while waiting on a new parts. The engine had a few surprises including a high compression piston, big bore, and lots of head work. Along with a broken intake camshaft and a bent intake valve…. So now I am not sure what to do with this far from stock head. Has anyone ever messed with a head that has had enough work to accommodate 40mm intake valves and 32mm exhaust valves? Any recommendations on fixing this head or would I be better off picking up a used head that is stock?