WRONG

 

Maybe I am, but with the lack of a response to prove it, you're not saying much are you? What show did you watch that reported that 93 octane gas harms motors? Why would they sell fuel that's going to harm a motor. Liquid propane is 120 octane, they have conversion kits for vehicles. Why? So they can grenade your motor for you? Back it up with facts, I'm not ashamed of being proven wrong.

 

What are octane ratings?
Octane ratings measure a gasoline's ability to resist engine knock, a rattling or pinging sound that results from premature ignition of the compressed fuel-air mixture in one or more cylinders. Most gas stations offer three octane grades: regular (usually 87 octane), mid-grade (usually 89 octane) and premium (usually 92 or 93). The ratings must be posted on bright yellow stickers on each gasoline pump

Straight from a petroleum website my friend.

 

Increase the compression ratio - Higher compression ratios produce more power, up to a point. The more you compress the air/fuel mixture, however, the more likely it is to spontaneously burst into flame (prior to the spark plug igniting it). Higher octane gasolines prevent this sort of early combustion. That is why high-performance cars generally need high octane gasoline - their engines are using higher compression ratios to get more power.

Shall I go on?

 

Higher octane fuels resist "detonation". Detonation occurs when excessive heat in an engine (mostly performance engines) causes a flame front before the spark plug ignites. If an engine detonates enough, it will burn a hole in your piston. Pinging is not always from detonation, it is mostly caused from lack of combustion efficiency. People that run too much octane in a stock engine will often hear 2 things; the first is an afterfire (not a backfire) or a pop out of the exhaust on deceleration, caused from unburned fuel or fuel vapor contacting a hot header. The second noise is a valve train rattle, most stock engine configurations will not efficiently burn all the fuel "on time" and the result is a rattle often refered to as a "ping".

Arctic Cat recommends 87 octane. If you run a 93 you will not damage your engine, and you will not exactly help your engine either. My advice is to use 87.