Here are some pictures of the Oneill brothers 30cc. They make two engines specific for the Losi 5ive. One is 27cc and the one I bought is the 30cc. This is a full mod motor cost was 575.00 rated at 6.75 horsepower. Make sure whenever buying a aftermarket motor that you pickup a zenoah. I have had many built cy engines in the past and maybe it is just me but I always blow head gaskets due to the two bolt head. Zenoah's have four bolts you wil have way more reliability with your power. If you have built any engine at all model or full scale you will know what I mean when I stress high performance with reliability. It just equals more fun lol.