Can anyone help me please?

How do I adjust my air/fuel ratio on a 99 warrior? Don't know where the screw is.

I put a new spark plug in and it fires up and runs great. When I shut it of and try to restart, it won't start. Spark plug looks like it is dry carbon fouled, which I saw on the net. If this is the case, do I need to give it more air or less air and how do I do it?

Thank you in advance!

 

i think that "air acrews" are a 2 stroke thing, there is a "mix screw" on the carb, underneath after the carb bowl and before the intake manifold, you need a flat head bit to get to it. this screw only regulates the amount of gas going to the pilot jet. when you checked your plug, did you just let the quad idle then turn off, or did you ride for a little while then turn off? if you just let it idle and then checked, your pilot is too rich, make sure the screw is 2.5 turns out. if you rode it and then checked the plug, your main jet is probably too rich.

 

Thank you very much for the input.

After a few short tests, it seems as though it is dry carbon fouling after idling. If I start it up and go for a ride and shut it off immediately when stopped, the plug looks much better. The insulator tip is still white. But after idling and then pulling the plug, the insulator tip is dry black. Unfortunately, I don't think this has anything to do with my hard start issue. After running it and shutting off, it wouldn't restart. I put a new plug in and still wouldn't start. Then I hooked the charger up and set it on boost and it fired right up.

See....I've been having a hard time starting the thing. Once it is running, it runs great. But once I shut it off, it's hell to start.

One thing I think I may have caught onto about the hard start issue....I think it may have something to do with the battery. Although the battery seems to crank the engine fairly well, it won't start. But today when I was messing with it and that happened, I hooked the battery charger up to the battery and set the charger to boost and the quad started every time. Take the charger off and it won't start.

Could there be an issue that the battery (even though it is cranking the engine) isn't pushing enough amps or something to start the engine? I know it isn't the right battery for it. The person I got the quad from replaced it with a battery from sears or walmart or something.

Any help would be greatly appreciated.

 

The only screws on the carb that I can see are adjustable is one on the bowl itself that points toward the left side of the bike (horizontal, which I think may be a drain screw) and one on the carb just to the front of the bowl that goes straight up and down (which sounds like the one you are talking about). If I take that one out, it is like a needle jet with a spring around it. Is this the one you are talking about or am I missing something? This screw sits flush when seated all the way. It is not recessed.

 

yes get a new battery the manual also says about the battery goping bad and not starting it cause of amps or w.e.

 

Got a new battery. It still doesn't fire right up, but if I keep it cranking for a few seconds it will start. I checked to make sure it is charging and everything ok with the charging system. 12.76 volts with motor off. Over 14 volts while running.

 

I really doubt it's your battery. As long as that battery has enough power to turn the starter it's got enough to give you spark.

Are there any mods on the warrior or is it all stock?

It sounds like you need to lean out the idle mix some. The fuel screw to adjust the idle mix is under the carb, forward of the float bowl. It's inset in a hole a little bit so it's not real easy to see, if possible at all. Turning it in will make it leaner, turning it out will make it richer. You'll need a real short screwdriver to adjust it, I just use one of the short screwdriver bits that come in a set, and are designed to go into a screwdriver handle or used with a ratchet (if that makes any sense, i'm not sure what they're actually called). Anyways, try leaning out your idle mix first and see if that helps your hard starting issue. I'm betting it'll help, because if the idle is too rich it's almost like starting with the choke on (when the engine is cold the choke helps it start quick, but you'll never start a hot engine with the choke on)

 

The are only 2 screws. There is the drain screw and probably the one you are talking about which is just to the front of the bowl. I pulled that out when I took the carb off and cleaned it. It is a needle valve. Is that what you're talking about? So, turning it in will lean it. I thought out would lean it. I guess I was wrong. I think I have it 2 turns out right now.

 

Yeah, it's the needle valve you found. It's a fuel screw, not an air screw like on 2 strokes, so turning it in will make it leaner. I think the stock setting is either 2 turns out or 2-1/2

 

I’d check your stator with an ohms meter