Type of gas in a 08 Te 450

Just got an 08 te 450 used w/ 133 miles. owner knew nothing about bikes and hadnt changed the oil. (ahhhhh). he lost all the manuals etc so i was wondering what type of gas goes in this thing. Im guessing 91 (premium) based on the 12.9:1 compression ratio but i thought id ask before i made a mistake. also does it matter if i put in the wrong gas? what could this do?

Does the power up kit make this bike a little harder to stall? i have had some problems with the short stroke motor stalling on slower more technical single track. it seems VERY lean at low rpms. snapply throttle tho

Not sure about there in CA, but here in PA we can still get gas with no ethenol in it at select stations. My bike has no pinging/predetonation when I run the high grade without any ethinol, but if I use high grade with ethinol it pings.

With only 133 miles the engine and suspension are only one third run in. The motor will free up significantly and it will lug much better in the tight. This will see less stalling.
Use the best fuel available preferably without ethanol.

Interesting..have you ever tried the lower grades that do not have ethanol?

Never even thought to try lower grades since the manual states to use a higher octane than what's available at the pump here in PA (93 is the highest I've found). Funny because my wife's 2007 700 Yamaha Grizzly (FI also) manual states to use low grade 87 octane - which I do and it runs fine. Maybe I'll give it a whirl.

I've run regualr in mine and it's fine.
I do run high test, 93 and it runs a bit better.
I went down 1 tooth in the front, installed power up kit, has about 300 miles and runs much better than it did new. They are corked up from the factory.