fantastic kit. it makes a whole lot more power than a stock 125cc. this will work on the piranha 140cc electric start part no# WHS-3284 IF you trim down the two lower most bottom fins and use the 13mm piston part no# TBW0823. i used this setup on my motoped pro with a 17 tooth in the front and hit 60 plus mph and still had more in the top end . i will have to go down in the rear to make use of the extra power !
