2003 KFX 400 bogs down with gas ????

[tomscarpt]

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 .

[lasxgames]

first check and clean the air filter, then gas cap vent, then check the fuel flow to carb.

[DirtDemon]

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.

[bowhunter]

Drain the fuel and start with fresh fuel. You will most likely find it to be the carb needs cleaning out/gummed up. It is best to turn the fuel off while the bike is running and let the remaining fuel burn out if you are going to let the bike sit for more than a few days.

[DirtDemon]

Changed title and moved thread like I shoud have done before. Have you figured out anything yet?

[Ajmboy]

How's it going with this?

[dirtjunkie85]

I would defintly check the things the others have posted and if that don't solve your problem I would have the valves checked this may sound odd but I had 2003 KFX400 and had the exact problem and it ended up being the valves were out of adjustment.

[Lylequadprobs]

I have a 2003 kfs400, my quad also bogs when throttling. I changed to new gas, I ran sea foam through the motor,I cleaned the carburetor jets and it still bogs when throttling. Anyone find a solution to this problem? 

[Gwbarm]

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.