In general, most oil companies save the better detergents for their higher grades. Some use the same in all grades.

So if your engine runs perfectly with no predetonation on 87 or 89 then running 100 would result in an incomplete burn thereby leaving deposits or particulates in the exhaust. In a car a catalytic converter would burn the particulates off before they were completely expelled. Also, most cars have some sort of knock sensor that retards ignition at any sign of predetonation.

If the manufacturer recommends 87 then you can probably use 87 all day long. Using 90 or 94 should not in anyway hurt the motor or leave excess carbon residue. But it's 20 - 40 cents a gallon more so it'll leave less money in your wallet as well.

It is relatively cheap insurance to go up a couple of grades if you know you're gonna be flogging the crap outta your ride for extended periods (track day) but for ordinary riding there's no reason to continually use a higher than recommended grade. And unless your bike is tuned for it, the 100+ is just pissing away money for less performance.

RE: Cold fusion = one bourbon, one scotch and one beer

 

Whatever Costco uses is what I use.

Also, whatever is used at the tiny station in the canyons is what I use...cause they're the only ones that have gas out there...period.

Excellent!

 

So I decided to try 87 today, and I must admit, the bike did run better. I guess they are tuned for it, I have just never owned a bike that didnt say premium only on the gas cap before.

So how do you tune it for premium? adding a 07 r6 style exhaust, and k&n filter + jet kit soon, is there a way to tune the f4 for premium, ar jet for it?

 

last refill i tried out the 87 and she runs just fine, thanks

 

To tune for higher octane = more compression, ignition advance, blown motor, NOS, etc.

And I must reiterate -- if you intend to wail away on your baby like a banshee (i.e. trackday type riding) then a tank full of the high $$ stuff is not a bad idea. But for most any other riding you'll be just fine with what the manufacturer suggests ...

 

what do you think about the 4 degree timing advance rotor, is it hard to install, and is there any power to gaine? would u then want to run premium?