this is my gx390 kart. to start off the chassis is a cpr chassis, which in my eyes is the best chassis ever, im very impressed with this chassis, it holded real well. to the engine it was off a pressure washer that came into work, the pump was blown up and there was no point puttting a pump on it seeing as a pump was $700 and a whole new one was $800. drive trains all cpr clutch and sprocket. costum engine mount to convert from gx200 to 390. painted black, was originally green seeing as it was a clone chinese motor. still working on a clutch guard, not a safest at the moment. i must say before this engine i had a gx200 and now i got this that it does have double the power top and bottum end. all i can say is this thing eats gx200 s any day.