!!!!!!! that happened to me this morning....i kicked, and revved...got ready to shift into first, and it started to bog down, what i did, was take off my carb, clean it, took my "air/fuel" pilog screw, turned it all the way in, and backed it out a turn and a half, or turn and 3/4. and adjusted my idle until it sounded smooth, then a quarter turn back in, and it ran fine again, if it isnt that, it could be a cracked/broken reed, bad compression, but make SURE YOU CLEAN YOUR CARB, and if you were burning a lower octane fuel than 93, go and buy some racing fuel, or some of that "STP" crap that has jet fuel in it, it can clean your carb pretty good too, so if none of this works, take it to a repair shop to have them evaluate your problems