Hi! So I’ll start off by saying I recently bought a 2009 200xc that was rebuilt by the previous previous owner and had the cylinder sent off to powerseal USA and he installed a vertex piston. He then sold it to somebody who ran cheap gas station premix in it (for the 2 weeks he owned it before I...

I'm wondering if anyone else has ever had this happen. My son's 200xc recently got a complete top and bottom-end rebuild. I bought the parts from Rocky Mountain, but had a bike mechanic do all the work. After two weeks we got the bike back, took our time breaking it in, and then started taking...