Here is my quick review of the engine. i got it bolted the carb on and stripped out one of the bolt holes to hold it on. i used longer screws and carb sealer and did not tighten so much. metal on the case seems alittle soft. broke it in per manual not a problem at all. have about a half gallon in it now and two race weekends. my temps are around 245 when its 70 outside. bottom end is awesome and top not far behind the more expensive engines. im not here to say its faster than a speed or novarossi but its def. holds its own on the straight. only at the very end last 20 feet do i see where the others have a bit more top end. great engine for $230 just hope it lasts.