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Trx300fw issues

2K views 11 replies 2 participants last post by  Tpence 
#1 ·
I have a 2000 trx300fw it appears my spark is not conistant. It will start and idle at first but then started to surge. Anytime u try to give it any throttle it will burp through the carb and shut off. I'm at a loss. Have checked timing and replaced the pulse charger beside the stator. Any help would be amazing. Thanks
 
#2 ·
You first need to determine if it's a fuel or spark issue. Surging usually indicates a lean condition in the carb, but a weak spark will cause many similar symptoms of carb issues.

Take the spark plug out and close the gap to about .015 or .020" - if it runs right, then the problem is definitely spark related. If it runs the same, dump the fuel into your car or truck and try a fresh fill of 91 octane (or higher) non-ethanol fuel. If that doesn't change it, have the carb thoroughly cleaned. It's kind of a witch hunt when you have this type of problem.
 
#6 ·
Usually, if it will start, but not accelerate, the problem ultimately comes down to bad gas or a carb problem - most ignition problems result in no spark or breaking up at the upper RPM's

Try choking it when you accelerate or spray fuel into the intake as you accelerate - if it seems to accelerate normally even just temporarily - it's probably a carb (or fuel) issue.
 
#9 ·
Ok so I have also tried that. I am almost leaning more towards some sort of spark issue. The fourwheeler does start and idle for the most part but is not smooth. I have tried two different carbs and no change. I have tried two cdi boxes and a new little black box beside the stator. I'm at aloose. Usually pretty good wit these motors but this one has got me
 
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