Maybe you guys can help me out here because I'm stumped. Simple things are usually what stump me. Anyway, got this Champion 3500W generator with a 6.5 honda clone motor on it. I bout it years ago but never needed it, so a couple years in the box with no gas through it. That big wind storm came through in July and we were without power for 11 days. I got it out them and it ran perfect, about 5 hours per day, for 5 days. It was running fine and I shut it down, disconnecting power to the AC first, to fill the gas tank. When I went to restart it, it wouldn't run. It says to choke when you first start it, even if it's 110 degrees outside. It had just been running for a few hours so I didn't see why it would need choked. Well I tried choke just in case. It would barely run, shake everywhere, puff black smoke, sounds like running rich to me. I slowly unchoke it. For a split second it leans out and smoothes, then dies. I've tried most everything I can think of. Took the carb completely apart and it's spotless, with 20hours on it I'm not surprised. I tried a new plug and fresh gas. It always does the same thing, if the choke is on, it runs terribly and puffs dark smoke. If you take the choke off, it dies. If you try to start without full choke, it does nothing. I have two more thoughts up my sleeve. Could the OHV valves have loosened up that fast and would that cause my problem? Also what about a sheared flywheel key, could it have happened so soon and cause these symptoms? Thanks for any help guys.