Hi all newbie here. Just got my first quad. 2008 Yam Kodiak 350. So the dumb question...how many plugs are in this beast and what do you gap em at?

I've had this mint bike for a month and half - ran awesome, have only put about 100k on it. Then yesterday filled it up with gas, and it started sputtering, backfiring and absolutely no power. Surging actually.

Gonna start with new plugs. Already dumped some seafoam in the gas didn't help. If plugs don't do it, I'll have to tear the carb apart.