So this new trick is that when the engine is under a load and having to work, the whole bike starts shuddering like you flipped on a paint shaker. It doesn't do it at all if you're in neutral and revving the engine. If you're in lower gears, it just starts to surface towards the top end of the throttle. If you're in 5th and gun it, the engine shudders like crazy at like 1/3 to 1/2 throttle.
Carbs are freshly rebuilt by The Man Carl Leo himself, and it's had Seafoam in the tank pretty much since I bought it. I put new spark plugs in it, and new spark plug caps/ends (whatever you call them) when the carbs were replaced.
I feel like it's probably an ignition system issue of some sort, but that's just me guessing. Anyone with more experience have any ideas?
