Bogging in and out after runnin for a lil bit

[Wood_15]

I've got a 440ex, and it boggs, spits, and stalls. The air filter is clean, and a new plug. I pulled the plug and it has chalky deposits on it, and according to the spark plug chart means that the gas i have is contaminated or oil is getting in somewhere i don't believe its oil i have looked it over and seems like bad gas to me, but i have 110 in it. I'm getting new 110 tomarrow and am draining the bowl, plus the tank. It seems like i might have water in it, I don't know how but that seems to be the only explanation. If any of you guys have any ideas, i'd appreciate it a bunch, thanks.

[300ex_honda]

is there water in your air box?

[Wood_15]

There was when i washed it but i put a freezer bag around my filter and rubber banded it so none would get in but maybe a lil got through

[EXtremeEXer50]

i doubt that a little bit of water would do that....i wash mine with nothing over the filter all the time and it never hurts it

[300ex_honda]

i rode one day in the hard rain, then once that cleared i was out doing wheelies but it would keep stalling on me in the middle of them, and even just riding the roads it would stall, when igot home i pulled of the drain and looked inside the box and it had lines showing about 3 inchs of water in the air box, which then afterwards worked fine

[cals400ex]

a mainjet too big can cause these problems

[Wood_15]

Thats what i thought, but doesn't seem so with the plug being really lean. I talked to a buddy of mine and i'm gonna clean the carb and drain the bowl, and see if that works.

[cals400ex]

what mainjet are you running and what mods do you have done to the motor?

[KY Woods Rider]

The first thing that came to my mind when you said it was a 440 is the head gasket. If it had been running fine and then just started acting funny for no reason, a blown head gasket could be a possibility.

[Wood_15]

Well i finally found out what was wrong when i went to tear my carb down and clean it. Turns out that the intake boot from the carb to the motor cracked all the way around and separated, which caused the air leak, and the lean condition. So i get to head to the dealership and pick up a new un. Wish i woulda figured it out before yesterdays race but o well. Thanks for the help.