It'll idle forever, and go when I giver gas. Doesn't miss or flutter at all. Doesn't leak gas outta the carb at all.( I looked inside the air filter the first couple times this happened, to see if it was soked, and it was dry)

I got 140psi cylinder compression...

When the spark gives up, I change the plug with a new one, and right away, I'm off to the races...

Would a hotter or cloder plug, quick fix this problem? I had a couple of sleds that did the same, and i went from a BR9 to a BR8 and no more plug problems...

 

You could try the plud idea, switch brands a couple times too, and see what happenes.

 

plug*

 

plug issue my xl350 enduro was the same. make sure your choke is off lol. on my 350x plug says DR8ES-L "R" Resistor Plug.

 

Resistor pulgs... do I have to have a resistor style cap, to makem work properly?

Or, will "B8ES" plugs instead of "BR8ES" last longer? I know the B8ES is a 2 stroke sled plug, but it should still burn.

Went out for a tour yesterday and no problems with the BR9ES...YET.

 

the plug in my 200m is a DR8ES-L

 

the differences between DR8ES-L and DRES is the length. L stands for long, with the shorter Plug you are farther from piston so it won't burn quite all the gas which will cause to foul, I think? also check the gap on the pulse generator (cdi) that will cause the same thing