Won't pull past 7k where the fun is

[Guest]

Finally tracked down an air box lid. Carbs got a spring clean even though they were working fine.

low throttle needs a little screw adjustment.

every throttle position at every RPM is better than it's ever been. It's always had issues starting around the 7k mark.

could it be ignition leaking voltage?

ignition breaking up (don't have points)?

sparkplug gap too wide?

have new wires and plugs, haven't checked gap.

valves are adjusted.

cam timing? I've Checked cam timing, even moved them one tooth.

I don't think it's fuel. I've gone from stock mains (110) out to 130.

the only mods are drilled baffles.

Ive got a katana 600 donor bike and spare untitled mock up frame so the bike will be getting swapped, but I did it this way to keep riding while it gets sorted.

Help!!

[tom203]

"cam timing? I've Checked cam timing, even moved them one tooth.
I don't think it's fuel. I've gone from stock mains (110) out to 130."

i'd go back on mains. Are you sure that you got cam timing at 20 pins from marks 2 to 3 ?

[Steve]

The next time it breaks up at 7K, hold it there for just a bit, then pull the clutch, hit the "kill" switch and coast to a stop in a safe place. Pull the plugs to see what they are telling you. My guess is that they will be telling you they are getting too much fuel, as Tom203 was suggesting. If all you have done is "drill the baffles", why did you go up SIX jet sizes? Unless you thoroughly gutted the chambers, one or (maybe) two sizes would have been sufficient, but six is way too much.

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