It's an older bike. My brother-in-law had it sitting in his garage for a couple of years. Offered it to me to drive for the summer. Plenty of bottom end -- real torquei in fact -- but a real dog on the top end. On the highway it can barely do 100 kph maybe 110 with the wind in fourth. But if I drop down into third and get the revs up over 8000 all of a sudden I can feel it "grab" and take off, really take off toward the red line. Scared me actually. Any idea as to where I should start looking. I've changed the plugs to NKG as per the spec. I drained the tank and put in fresh gas. No difference. Thx. Seems to do a little better when running hot, like 30 to 45 minutes into driving.
The more I read the more it looks like a classic stator/cdi problem. Basically the bike kacs at around 4500 rpm. There are two circuits one for the low end and one for the high end. I'm going to try by passing the highend and tieing it into the low-end to see if it makes a difference.
Well shame on me. I don't have a CDI ignition, I have a Transistor ignition. The problem turned out to be the carburetors. Once I took them off and cleaned the jets and reassembled the whole thing my problem went away. The bike goes like a rocket now. I should have known it was starved for fuel.
