this is not a typical minimoto engine . frank modified the cylinder to alow coolant to flow around the exhaust port to alow better cooling for added hp and much higher rpm.so much power the typical 3shoe clutch pads wont work so a ktm 50cc clutch was modified to fit and will probably last 3 lifetimes . it grips and doesnt wear . clutch bell modified 2mm larger i think. please if you are new to the sport this item may not be for you . this was originaly for a mini quad i built but did not work out. all parts on engine are new and assembled by giannini racing . 23hp was recorded on the dyno with a different engine identical modifacations . this item should produce a little bit more . i paid 500$ for port work and it took 6hrs by the one and only frank giannini . he didnt want to take the job but i begged him and he had the motor for 7 months. haha . it doesnt get any better than this i made sure of it. this is 1 of 3 frank built . its a gem.engine has not been broke in nor clutch padspolini cases,cylinder 50cccustom ktm clutchbzm pipezpf dome for more water volume to coollightened bell housing zocciedelorto 18mm jetted for this engine by frankbzm coil polini blue reedspolini flywheelbzm clutch bellpolini blue craankpolini radfresh crank bearings and sealsmisc parts im just throwing in for free, some are good some are bad no guarantee.if item is not described above its a misc part