Does anyone know what kind of spark plug this ATV uses? Asking this because before I adjusted the gap on the plug inside the ATV would vibrate too much and would have hesitation at full throttle. After I adjusted the gap to 0.028" the hesitation is gone at high speed but still has some vibration left over. I'm thinking a better spark plug would get rid of this?

The spark plug already in it is a "S X A7RTC" and the gap size set to 0.028".

 

Additional info is the when I reach full speed and then let go of the throttle the engine has high vibrations and the engine backfires.

 

for vibes, check your motor mounts. make sure the rubber bushings are intact and the bolts are tight.

 

For the mounts it has the 2 bottom bolts and the 2 top bolts that go to the frame. It looks like there is no rubber bushing between the motor and the frame. I think it would go (frame)--[bushing]--(motor) but it does not seem like there is enough space at all for a bushing to fit in between. So maybe there is another place on the bike to absorb the vibrations?

 

so it doesn't appear to have a place for a rubber bushing in the motor mount? hmmm.....????

 

Here is picture of the top motor mount and the bottom motor mount. By looking at these it doesn't look like there was a bushing there to begin with.

Top Motor Mount

Bottom Motor Mount