My friend has a 250 Polaris Big Boss 4x6, and the model # is: W908627. He doesn't know what year it is or even have a manual for it. He said he was driving it slowly and it made a big pop and stalled and won't start again. It cranks over really easy by hand, so I did a compression test and got 100 p.s.i. That seems like enough to run. But I couldn't get the plug to spark, so I put a spark tester on it, and could only get a really weak spark. Does anybody have the same model? Obviously the plug is fouled, but why isn't there a nice fat spark? Weak coil? bad ground? Does anyone have a mnual with resistance tests for the coil and cap?
I didn't really even look at it, but does it need battery voltage to spark, or is it straight magneto? Any help or advice would be greatly appreciated, Thanks.

 

well at least i know that its a 1990 model. the first 2 numbers after the W is the year.

i would definitely lean toward checking out any and all of the ignition components. with compression like that it should run purty ok.

let us know what you find out!

X

 

100 lb is a little low i would first get your spark goin strong, probablly a weak coil. check your SP wire too may have a short or pinch in it