My k star has great low end with just doing the two hole on the piston mod. And shining up the exhaust. If you take off the head and look at tdc, the piston already looks mighty low. I wouldn't suggest raising the jug. I'm gonna be doing the same porting that was mentioned a couple posts up when I get some bits for my dremel. also, I'm gonna experiment with a big carb and pipe. I know one of the ire dudes is running a 19. But with an estoril I'm pretty sure. It should be intersting how it reacts to a simonini.