400ex problems

[roman96]

so i changed the piston rings on my 400ex. set the timing, cleaned the carb, put new oil in, new gas but when i start it (with choke on) it wont run for long. any suggestions
. its raelly starting to make me mad

[pighater400ex]

Try adjusting your idle screw that should do it

[roman96]

tried, doesn't work, and recently gas started leaking out of the carburetor

[pighater400ex]

Is it coming out of the drain tube ?

[powerbomb400]

This sounds crazy but try standing it straight up. Hold it there for a minute and set back down. See if that will help it. The float bowl could be stuck and sometimes that will help seat it back on the needle.

[JOHNDOE83]

You could just tap on the float bowl with a screwdriver handle and see if it stops leaking...lol.

But yeah that would indicate a stuck float/ceet.

[CJM]

you got a stuck float, open the carb bottom up and check the float. See if it moves freely and check/clean the needle. Also take the float off and pour some gas in a can or GLASS jar. If it floats your fine-it sinks you need a new one.

[roman96]

the gas is leaking out of the tube that is to the right of the idle screw

[roman96]

Originally posted by pighater400ex
Is it coming out of the drain tube ?

the gas is leaking out of the tube that is to the right of the idle screw, im pretty sure thats the drain tube

[pighater400ex]

Ya thats it there is a screw right there in the carb not the idle turn that in but not to tight see if that stops the leaking same thing happened to me this morning

[roman96]

Originally posted by pighater400ex
Ya thats it there is a screw right there in the carb not the idle turn that in but not to tight see if that stops the leaking same thing happened to me this morning

its already turned all the way in, isnt that the idle screw

[roman96]

OK so i stopped the the gas leak but now it started smoking, i know its not the piston rings bcuz i just changed them. any idea what it could be. could it be bcuz of the air filter?

[pighater400ex]

What color is the smoke ?

[roman96]

white/gray

[pighater400ex]

White smoke is condensation or common on a freshly rebuilt motor and you did say you rebuilt it right ?

[roman96]

i didn't really rebuild it, just change the piston rings, honed the cylinder, and put new gaskets and seals in and i did everything right. my dads a mechanic and checked to make sure i did everything right

[pighater400ex]

I think it just needs broke in Id just ride it around some go through all gears.