I have a kymco mongoose 250, will start and run but will kill if given any gas it kills,. I cleaned the carb, tank and valve, filter, even swapped carbs with another kymco that was known good so I eliminated the fuel system, then changed spark plugs, checked compression. I bought a spark tester and watched the spark and it will get weaker and die with the slightest increase in rpms. before I started checking I just wanted a little input as to the most likely cause of that might be or to get some ideas. coil, pulser coil?

 

Welcome to the forum bbruno , kymco does make the small ac model's now up to the 366 quad's , from the 400 up are made by Suzuki and Arctic Cat's own factory ; as to your problem it could be your throddle free play adjustment , this adjuster is located on the right handle bar .

There is a rubber boot you have to slide down to get to this adjuster , there is a plastic **** to loosen to do the adjustment , then you can either turn the cable adjuster left or right to loosen or tighten the free play ; free play should be from 1/4 to 1/8" inch i've seen this problem on the larger Cat's so it should be the same on the kymco's as well .

I hope this help's you get the 250 going , this is the only thing i can think of for now , if i'm wrong someone who has experious with the electrical problem's you asked about !

williebee......

 

its definately something in the ignition because I am losing spark

 

I'll try to dig up my old service manual and see what it says. Would be for an 06 model, but that may be of some help.

 

its either an 05 or 06

 

Check you PM.