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2003 KFX 400 bogs down with gas ????


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Have a 2003 kfx 400 decided to go for a ride and after 10 minutes it started to bog down after giving it gas.It starts right up and idles like it was new.It bogs down after reving it up will run all day at idle.The only warning i got was it did backfire a few weeks back and conked out drove it back to the garage and parked it.What could this possible be.Spark plug? Cloged carb? or electronics. Could use some help .

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Certainly look at the plug, even if it looks ok, change it and see what happens. Start with the simplest things first. Also, there could very well be something stuck in the carb, it couldn't hurt to take a look inside there and give it a good cleaning, but first, make sure the gas is getting there like the previous poster suggested, it does sound like a fuel starvation issue to me.

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Checking valve clearance would be a good thing to do, but it sounds like a carb problem to me, I would clean the carb jets again, don't forget the one down in the hole, gif you are using ethanol fuel it has a tendency to collect water in the bottom of the carb that eventually turns to jelly. Something to look at, also inspect the vacuum slide carefully for pin holes.

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