Hi , i have bought mbk booster 50 for stunt ... it has minarelli vertical engine, with leovince sp3 and malossi multivar 6.5gr rollers .. but it goes bad , have good start but acceleration falls, it dont have power to hold on wheel ... which setup is the best for stunt on that engine [carb setting , transmission ] ?

you bought used semi tuned scooter...
here is no other choice than to sismantle whole ngine and chek piston rings, berings and stuff like that... make it full setup ready for seson 2008

this winter the whole engine will be rebuild .. and i will make sliders, 12 o'clock bar and other stunt stuff and there will be project soon...