hi guys. today my 400ex cut off while was riding. after trying to restart for several minutes i took a look. i made nsure that gas was coming from the fuel tank. i checked tank breather, crankcase breather. i took carb apart and looked at the main jet leak jet pilot jet and main jet holder. i held the carb up to the light with the main jet cap off and opened the slide and i could see a pinhole of light. no blockage. reassembled everything and tried starting wiith air filter off.
So i noticed the accelerator pump was working but no gas coming from the main jet when the slide opened. i thought it would be flooded or fuel fouled now because im always pumping the gas when starting and ive ran into that alot before. plug wasnt even wet after like ten minutes of pumping gas and turning it over. i drained the float bowl, it had gas in it. so im down to this: i have gas in the bowl, all jets are clear, the carb is "sucking" but no gas coming through the main jet. im thinking like air cut valve? it seems like as gas leaves the float bowl something has to enter to replace it… you cant suck liquid out of a completely sealed container …so either….float valve will allow gas into the bowl but gets stuck closed once the bowl is full, which would prevent any gas from being drawn out of the bowl or there is another valve for this purpose that is stuck closed? im just speculating but i know the petcock is fine, i checked the valves, all jets are clear, accelerator pump is working fine…but no gas is being drawn up from the bowl into the carb. am i on the right track? obviously the next step would be spray starting fluid into the carb, however i did all the work above with a very small tool kit i take with me, and i ended up leaving my atv about a mile up in the woods and walking home. Im going back in the morning…its too far with too many hills to push, i dont know anyone else with an atv to pull me, my truck cant go there, so it will sit there until i repair it or someone solves my problem by stealing it. thanks in advance