Polaris 800 Pro X - Manual (Page 60)

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OPERATION
Fuel
The fuel used in your Polaris engine is as important to engine life and
performance as the lubricant used. Most Polaris snowmobile engines
are designed to run on 87 octane non-oxygenated or 89 octane
oxygenated pump gasoline, but a higher octane fuel (premium 91
octane) is preferred for the PRO X models. Always use the premium
fuel switch when using premium fuel in your machine.
Premium Fuel Switch
Your Polaris snowmobile is equipped
with a key function to adjust the
timing on the machine as you change
fuels. It’s very important to the life of
your engine that you use this feature.
When using fuels with a pump-posted
octane rating of 91 or higher, turn the
key switch to the ON/PREM position.
When the engine is started, a yellow
Premium Fuel light illuminates on the
instrument panel. When the key is in
this position, the fuel must be a minimum of 91 octane. Return the key
switch to the ON/REG position when not using premium fuel.
If you’re uncertain about the quality or octane rating of the fuel you
use, turn your key switch to ON/REG. The Premium Fuel light will go
out. This setting will adjust the timing of your engine to run on fuels
with 87 octane or higher. Polaris does not recommend using fuel with
lower than 87 octane. Running your machine on ON/REG will help
protect your engine from damage caused by low octane fuels.
Using fuels with a lower than recommended octane or operating
with obstructed fuel systems will result in serious and costly
engine damage. Always use the recommended fuels for your
machine.
CAUTION