I have been running one since last summer. I run wildcat 5% fuel. I have it on a Morris Sudokoi.
gobs of power and great throttle reponse. Great engine for me so far! I have the small pipe Morris recommends
for the motor. I run a 10 x 5 prop or 11 x 4 APC. I broke it in on the bench very carefully letting it cool down completely
between 2 minute runs. Probably 8- 2 minute runs- then 4 -5 minute runs- adjust low end and peak high end and she should be
running great. You just get a real good heat cyle break in and it will be good. Lett it cool down completely between runs.