i have a 08 thundercat atv and it fouls out plugs every 200 miles. brought it in to the dealer 3 times and they always blame it on the gas, but we run the same gas in the other atv's and machinery with out any problems. does anyone have cures for this problem

 

I just got a 09 and put a few hundred mile on it with no problems yet. I am looking for some different wheel/tire setup any clue how big I can go with out lifting it

 

My 09 fouled the plugs at 300km and they replaced them
OK for now and there is 800km on it now

I had 28" mud lite XL on mine and the tranny flew to hell in it! (at 250km, the same time the plugs were replaced)
Dealer blamed it on the tires (they said the bike has enough power to turn any size tires but the tranny cant handle it because the bike has too much torque)
So I took them off and put 26" XTR's on

I also plan of pinning the SLD as that's just a pain in the rear!

 

Plus my top speed went from 135km/hr with stock (and now 26") tires to 110km/hr with the 28" I had before....I dont really need big tires anyways....I dont know why I bought them...They are for sale now...(50km on them selling for $400)...I just find you loose too much speed and performance...

 

 

you weren't slowing down with the biggier tires ,they just don't have to turn as fast as smaller tires to get the same speed . which will make your speedo read slower .

 

GPS Doesnt Lie
That's How Much Speed I Lost
Plus When Side By Side With Another Bike With Stocks My Speedo Was only slightly off...6 or 7km/hr in the difference

 

Nice Bike BTW
I Need To Pick Up An HD Front Bumper Like Yours
Bought The Rear One A Few Weeks Back

 

Replaced engine.. tranny injectors, coils 4300 later when I bought bike for 4000!!! Still fouling plug???