fuel octane on a 525?

[les70]

what octane and type of fuel you guys are running on the outlaws? i just picked up a new 08 525. the dealer put 89 in it(smelled old prob from sitting in showroom for a while). it dosent seem to run well. the manual says 91 or better. i was thinking on running half vp 110 leaded, half 89 pump.

[U1arunit]

91-93 octane is what I run.

No need for race fuel(even mixed) in a stock engine setup.

The gas in it from the dealer is probably just old. Put in some fresh 93 octane stuff and let er rip!

[al capone]

I run shell 93 if possible, if not highest grade 92 or so. I like to put a mix of race gas (not needed) just because it smells so good in the garage when tuning.

[les70]

ok. usualy when i had a engine that was 11.1 compression or above i always at least run a half and half mix. here in california the highest is 91 and i dont think its a true 91. i will try a 2 to 1 mix of pump and race.

[birdman7389]

The reason it does not run right is the Jetting. These things are way lean from the factory...almost un-rideable.

JD Jetting jet kit, get one....right now.:D

[les70]

yeah i figured already the jetting is off. i only rode it for no more than 5 min so far. i was going to pull the spark arrest insert and modify the air box before i realy take it out riding. which it will lean it out some more. i just wanted the best octane for the motor so i can get the jetting diled in.

[FiveTwentyFive]

Higher octane fuel will help the lean condition some.

[birdman7389]

Originally posted by FiveTwentyFive
Higher octane fuel will help the lean condition some.

How do you figure?

[FiveTwentyFive]

Higher octane fuel is in effect more fuel per amount of air. If your engine is lean, a higher octane fuel will richen it up.

[OutlawBill]

Originally posted by FiveTwentyFive
Higher octane fuel is in effect more fuel per amount of air. If your engine is lean, a higher octane fuel will richen it up.

Wrong

http://en.wikipedia.org/wiki/Octane_rating

[Terminator2]

Originally posted by birdman7389
The reason it does not run right is the Jetting. These things are way lean from the factory...almost un-rideable.

JD Jetting jet kit, get one....right now.:D

X2. The stock main jet is a 138 which is scary lean. At the vary least go pick up 160, 165, and 170 main jets. It will cost about $15 and one of those sizes should be just right. I am at sealevel and approx 60-80* and I am running the stock needle with the clip in the 5th slot from the top (a little richer) and a 170 MJ and she runs so much better now. I have the fuel screw turned out 2.5 turns as per my instructions on my quickshot 2 (was 2.0 turns on mine from the factory). Idles much smoother now. I have tried anywhere from 1.5 to 2.5 turns on the fuel screw and 2.25 to 2.5 turns works best for me. I have a modded stock airbox with no lid and the spark arrestor removed on mine so far. I am going to get a CT full exhaust soon and I might end up running a 172 MJ but I will have to see. I also have the zip tie mod. No bog at all even when going from a dead idle to WOT very quickly.