I'm going to start working on a answer for this soon. I'm just starting with saws but I've had a lot if experience porting motorcycles and banshee quads in the past. I've got a aircooled ktm 50sx in my shop now that's my son's. I ported and stroked a banshee that's a twin ended up 421cc that made 93hp on tt111 race fuel. Just so happens I've got a 385xp that needs a top end so I'm gonna see what I can do to a saw. Lol