im having a problem with my n600 and cannot figure it out.. it ran fine last time i parked it and then a week or two went by before i drove it again and now it has a miss. it idles perfect but if i hold the pedal at lets say 20% throttle it will miss and stumble bad. if i floor it and hold the pedal, it will rev up for like a half second and then the engine will just cut off and then once i let off the throttle it will go back to idling normal. it does this with or without a load on the engine. if i listen to the exhaust tip, i can hear a very slight backfiring while idling..
here is everything ive done so far:
-disassembled and inspected the carb twice
-brand new points and condensor set at the proper clearance
-brand new plugs with proper gap and heat range
-checked cam timing
-checked ignition timing
-adjusted the valve clearances
-compression test resulted 160psi and 150psi
-checked intake manifold for leaks
i dont know what else it could be, im lost!! do valves ever get burnt up in these things? i played aroudn with the pilot screw and it did nothing. the carb is getting plenty of fuel. the plugs are actually black...but theyve always been black even when it was running perfect the past year ive been driving it.
any suggestions? thanks!