I just rebuilt this bike. It wasn,t running when I got it.Power port is clean & timed.I put FMF Torque reeds in, but the reed stops weren't on the bike. Strong low & mid range, but it sputters & goes flat on the top end of the power band. Carb is clean w/ new #55 idle jet & #172 main.
I'm thinking it's probably the reeds. I would like some input before I spend more money.
if possile on that bike take the power valve arm cover off and rev it out to see if the valve is actualy moving... I had a yz125 that the linkage came apart on the bottom so it was opening it. Also...... plugged silencer? timing off?