My nephew's warrior's motor will die if you push in the throttle all at once. If you slowly push in the throttle it will smoothly go through all RPM's.

It has a K&N jet kit running a 136 main jet, K&N filter, and White Brothers E-Series exhaust.

We installed the above mods this past winter and it ran great until just recently when the above problem occurred.

So far I've cleaned the air filter, changed spark plug, even cleaned the disks in the exhaust.

I was thinking that since it ran fine in the winter and is acting up now it might need to be jetted down. So we replaced the 136 with a 132 and it didn't help. Do I need to go down more?

Any solution anyone has would be helpful.

 

Have you checked the plug color and the carb boots for cracks?
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The plug is white

 

But I don't know if that was caused by my just changing the jetting. I'll put the main jet back and a new spark plug.

 

Its an accelerator pump problem, I have read from other posts you can fix it by replacing the spring with a "click" pen spring. I am going to try it on my bro's warrior sometime.

 

I reinstalled my original jets and the spark plug looks fine. I checked the accelerator pump spring and I think that may be the problem. Or at the very least, a problem. The stock spring is weak. I pushed the plunger down and 2 out of 3 times it doesn't pop back on it's own. I'm going to replace the stock spring with the pen spring and will try it out tomorrow. Thanks CT and X44.

 

Nope, I still have the same problem. I've found other web sites talking about same problem but there are no solutions.

 

136 was probably way lean, the stock stuff is probably still lean. Try a bigger jet unless you live in the mountains or something.