hey new to the site and was wondering why my carb keeps popping on honda 400ex. i have to hold the gas to keep it running and it just continue to pop until it has ran about 20 mins. Any help would be great. thanks joe.

 

you say its "poping" aye? like a hesitation/cough at low throttel or idol? or a backfire?

if its at low throttel you need to bump up your pilot jet, your running a little lean there. pilot jet should be a little brass skrew on the bottom of your carb, turn it OUT 1/4 turn at a time.

had the poping problem on my foreman when i snorkled it, pilot jet adjustment did the trick.

 

yeah like a hesitation at low throttle won't idle on its own. tried turining the pilot jet but no difference. i was wondering if the jets are bad?

 

i would not think the jrt is bad, but it may need a cleaning. take out the skrew needle, o-rings, and spacer. clean that and the pilot jet hole thoroughly with carb cleaner to remove any gunk. cleaning the rest of the carb would be a good idea as well

have you modded the air box atall? if so you may need to get a larger size pilot jet...i had to step up from a 45 to a 50

 

cleaned jet but not the whole carb going to try that in the morning. top is off of air box and i'm running a 148 jet. Going to change to 170 or 175 cause i just rebuit the motor to a 426.

 

oh don't know what size pilot jet i have in haven't got a chance to look at it but the bottom jet is a 148 not sure what they call that one

 

ahh that yould explain your pop. you have alot more air flow now since the lid is off. my guess would be a #40 pilot, mabe a 45 would do you better

 

thanks for all the info cherokee. i'm going out and get that new pilot jet in the morning and try it out and see what i come up with. will let you know how it turns out. and thanks again man!