lean or rich
 

I rebuilt my dads carb on a 95 bayou the plug keeps fouling take it out its black as can be it last about two rides before fouling i adjust the air fuel mixture screw in a lil the motor pops and spits when you let off the gas ??? cant seem to get it rite which way do i need to go any ideals ??? and how do you know when its running to lean or too rich. any help is appericated ive been working on this thing for some whille now [img]i/expressions/face-icon-small-disgusted.gif[/img]

lean or rich
 

Doing a plug check, white=lean and black=rich. You want it a light brown, tan color!

lean or rich
 

also someone told me that oyu cna uset hte chock and pull it out till it runs good and if it does it's lean and if it's doesn't it's rich... idk if that works tho..

lean or rich
 

To get the best accurate reading on a plug to see where your machines @, If you can, get a wide open spot, ride around and get it warmed up and then 5th gear wide open, shut down the machine, coast to a stop and pull the plug and see where it is @. Like pendejo said white-lean black-rich. Right now your too rich, If the machine is not falling on it's face when you ride it, your pretty close, lean it out a bit and you'll have it! good luck[img]i/expressions/face-icon-small-smile.gif[/img]

lean or rich
 

Thanks for the help guys im gonna go out tomorrow and try again lol[img]i/expressions/face-icon-small-happy.gif[/img]

lean or rich
 

thanks for throwing that in rotty150, I screwed up my jetting hardcore the first time I used the plug check method because I ran at 1/4 throttle in 5th and the plug read rich instead of lean because of it.

lean or rich
 

i thought the mix screw was only for ideling you need to re jet if it is running lean or rich

lean or rich
 

Pilot Jet/Mixture Screw = idle to 1/4 throttle (maybe less than 1/4)
Needle Jet=1/4 to 3/4
Main Jet=3/4 to WOT

It sounds like your running rich, but not sure where. Rottys test is good to check if the Main Jet is correct, but you have to do the same for all of them. Your main jet could be right on, and your pilot jet could be way off, or vice versa. Is the plug wet (with gas) when it fouls out or is it just black and dry? Usually popping when you let off the gas means its lean. Sounds like your needle jet is too rich and your pilot is too lean, obviously its hard to tell on here. Anyway, hope this helps.