The Z1 is a great engine, Greg Biffle proved that at Pace. You can check with them to see if they have any for sale. Easily makes over 300 hp. The main issue is finding one. Suzuki made them, but aren't making them anymore. "IF" you can find one in good condition, jump on it. There will be obstacles to overcome though, realize that. Different clutch, drive shafts, possibly diffs (need to hold up to the hp) are just a few of the things you'll need.