Guys, i have an 81 model yamaha hopper and i restored it last year after being parked on our garage for many years. I'm having a problem regarding it's power, it's like bitin or the gear is not shifting to it's high gear? also I already replaced the cdi and the piston rings but namamatay pa ang engine pag di ako nag throttle? Do i need to have the clutch relined? replaced the ignition coil or what? with regards to the electrical lightings all are working even the charging of the battery. Tulong naman peeps.