It looks like the Predator vs Tecumseh discussion has been beaten pretty well, but figured I'd note the 8HP 301 on my VT7. Basically, it pulls very well and pops the tire off the ground with ease. I found it to be a very good engine for this size of bike...however, if I were to do it again, I'd put a big flathead Tecumseh or Briggs in there. It's surprising just how many things get in the way of the cylinder when you are stuffing it in there.