drewfinn
Active Member
I'm at wits end ( and wallets end). I've been working on a 74 ks125 since June. Bored cylinder,new piston+rings,new con rod,balanced cam shaft, bottom and top both rebuilt. Starts and idles great,but, under load,at upper rpms (5-6k) she sputters and misses, power loss. The only thing I can think of is that at some time in it's life the timing got advanced to far...any ideas,folks?