Re: serious loss of power
im having the exact same problem. i've taken apart and put back together, good compression, good mix, (32/1) new carb, good spark, everything moves freely with the spark plug off, there are some scratches on the cylinder wall from some shavings that got in there but i washed it out with gas and its fine.
nothing wrong with the bike, engine starts a kinda hard and only idles high, gets up to speed on flat but no torque. revs fine.
what in the world could it be? i've been using gasket sealer on everything.
its only too fast if you cant stay on!