[wood9781]

ok heres the deal, the 400 has been doin fine until yesterday when me and my ole lady loaded up the quads and was goin riding. we got to our spot unloaded. It fired up like normal and we rode for about 10 min then i killed it and tried to start it back and nuthing. I had a friend pull start me, it would start but I could only push the throtle in about 3/4 the way and it wanted to die. or when im trying to get up to spend it would seem to miss out then come back to. It wouldnt idle that great either. if i tried to smash the gas it would die. so I put a new plug in it and it fired right up, I rode for about 5-8 mins it died then I couldnt get it to fire back up. if I took the plug out and cleaned it with some sand paper. I would be able to get it to fire once but as soon as I let it die I couldnt get it to fire back up.

I have went threw the carb jets and cleaned them, took the starter apart and cleaned it, I just put gas in it about 4-5 days ago and rode it tottal of about 1 hour with know problems.

compression is 120psi
plug gap is .25
I checked the carb bowl, loosin the nut and gas came out. so its getting gas.

when I cleaned the carb it looked like the jet was a lil dirty. so I cleaned it VERY good.
i only had the new plug in for a lil bit before it fouled. even though I cleaned the plug real good checked the spark and it getting a good blue spark. could the plug be bad. if I clean the plug and put it in the 400 will fire and runs until I shut it off then you cant start it without cleaning the plug...........


can anybody help me please Ive tried everything I can think of..


THANKS FOR ANY HELP.

 

[Billy250X]

It's somehow getting to much fuel.Maybe your float is sticking open.

 

[Helmut]

I would try a new plug, anyway, just in case. I know you said that you cleaned the carb good, but it sounds like a carb problem. Maybe your float is stuck open and it's flooding. Is the plug wet with gas when you remove it? If it is, try turning the fuel cut off valve on just a tiny bit, so that you will just have a tiny stream of gas and see if it will run any better. If it does, your float is probably sticking open.

 

[wood9781]

only one time that i pulled the plug was it wet. most ove the time it looks kinda black like soot. Im goin to try a different plug tomorrow and see what happens'

 

[TRX2fiveO]

Sounds like a valve adjustment is in order to me.

 

[Redracer]

How does the air filter look? It is either getting too much gas or not enough air. If the float was stuck, chances are you would have gas coming out of the carb's overflow.