HI BULL! Your question made me curious so I did an engine search at RCU and found the HP 20. It pts out .75HP, weighs less than 8oz and costs $120. It wasn't rated though. If you want to see some eye-popping numbers, take a look at the K&B .18! Weighs the same as most .15s and puts out over a horse @19000RPM, sounds too good to be true.