Desperate - Unable to solve.
Been wrestling with this issue for over a year now.
Bike is stuttering and stalling on me after it gets warm. It idles fine. as long as rpms are up a bit it seems ok. as soon as i let off the throttle it rpms down and stalls. From a start it stutters a bit at low rpms then jumps alive once i get beyond 1/4 - 1/3 throttle or so.
Bike is ear shaved, rejetted (problem existed prior to this and yes carb vent is going to tank underside dead air location), mcct's, new plugs, new plug caps, new wires, new rear ignition coil, new free flow petcock, tank thoroughly cleaned, carbs thoroughly cleaned and partially rebuilt by me (worn parts only...no change), then rebuilt professionally, He also redid the throttle cables, carb boots (old ones were not sealing properly) and new r/r (bike wasn't charging).
The mechanic said that the rear cyl was not firing properly and suggested i replace the ig coil.
My wife is giving absolute hell and i'm losing my mind. I love the bike and want to work through the problems but her mouth is getting to me and it's making me want to throw the both of them out the window.