We are upgrading the engine on the Q2. It's a Revmaster model. Upping the bore from 92 to 94 mm. The case is getting sent back to Revmaster for the machine work. I'm also planning on have them replace the front seal on their prop adapter so the crank shaft will also be shipped back to them. I figure they are the best at it since they did build this engine. PIctures to follow after this weekend.