I received the 30cc and installed it on a CMP Giles. When hooking up throttle lingage the belcrank broke in two places. You would probabaly need 4 inch standoffs to make the muffler fit without hitting the motor box. Had the engine ever started I am sure the spark plug connector would have fallen off. I tried to start the engine for at least two hours, and I am not unfamiliar with gas engines, the best I ever got was an occassional pop. This is the second Chinese engine I have tried ( you would think I learned my lesson with the first). If you are going to spend 3-4 hundred dollars on a engine go with proven performeres, Zenoah, DA etc. I have a Zenoah 20cc on a Funtana 90 and it is just flip and fly, NEVER A DEAD STICK, SUPER LOW IDLE, Just a pleasure to fly. I would say the Venom engines from Copperhead Aviation need about 98 more points to rated as junk!!!!!!!!. They say you get what you pay for, WRONG I paid for junk and did not even get that.......What is cheap scrap metal worth???????