Regular (Car) Mobil1 is liable to cause clutch slippage. If you want to use Mobil1, gotta go with the bike blend as it doesn't have the additives that will react badly with a wet clutch. Another option is Shell Rotella Synthetic (truck grade oil, $25-$30/Gal at walmart), which doesn't contain the additives that normal car oils do.

I've been using Castrol Act-Evo synthetic blend (4.99/qt at Cycle Gear), it's really held up well.

 

If your not knocking or getting detonation with 87 octane, you won't build carbon any more than with higher octane gas. Some companies put more detergent in their higher octane gases, but that's a different issue. Regardless of what gas you put in your tank, if you don't start it up every 2 weeks you will gum up those carbs.

If it gets hot outside, it can make your bike need high test more. However, unless you're drag racing and doing power up wheelies in the sahara in the middle of summer, I don't think it's necessary.

If you really insist on putting premium in the tank, go ahead. It's just not going to do anything for you on a stock motor.

 

very bad lol. remember being told something about av fuel not being the same as reg gas or race fuel even. We use to run it in the sand rails etc, but we tore those engines down every couple years just cause lol.