I was wondering what gas octane is best for my new 03’ P-650? I ran 94 in the P-360 from the day I brought it home, per my brother-in-law’s suggestion. I have no problem running the 94 but was wondering if it was set up for if stock. I will not be able to do any mods for a while so I would like to know what they like to eat out of the box. I still have ¾ of a tank from the dealer but now that it is the weekend I will need to fill up soon.

All opinions welcome!

 

I've been running 87 in mine and haven't had any problems with it and mines still stock.

 

I've run 87 octane in mine from day one. Mine has several mods including pipe, filter, jet kit, etc... and I've had no problems. I plan to install a new cdi when availiable and they suggest running premium gas, but until then I'll stick with the 87. Just my thoughts.

 

Iv'e run 91 oct. since the day i picked up my quad (03 650) don't really know if there is much of a difference in different types of gas and in oct rateing but as for my ride i run only chevron or conoco fuel 91 oct. (always) just prefrence i guess.

 

Hi
Congrats on the new quad.
I have run 92 and it works well.If I could get 94 I would like to try it.[img]i/expressions/face-icon-small-cool.gif[/img]

 

If I remember correctly, on the bottom of the seat it says use 91 octane or higher. Alot of guys use 87 with no trouble. I use 91 or 93 mainly because it is non-oxygenated fuel and it lasts longer.

 

The 91 rating under the seat is not the pump octane rating that is required,it is the research octane rating or something like that, it equal's to 87 point's, like is posted on the pump's, I have done several test's with different octane's and different brand's,I ran 93 Texaco today and have used other brand's of 93, and my 650 makes more power with 87, it run's a little cooler and smoother with 93 but has better acceleration and power with 87, so that's what I'm running from now on............

 

Folks, we all love our quads and want to do whats best for them, and I can see the temptation to buy premium high octane fuel. However, our engines will run best on the cheaper 87 and 89 grades. The only reason to use higher octane is if your engine develops a knock, or you have high compression/advanced timing mods etc. In short, don't waste your money on premium fuel. 94 is certainly overkill, and you're actually probably losing some performance using it. The recommended number of 91 under the seat is not the same number as posted on pumps, that we are familiar with, as posted earlier. The number you see on the pump is the 'antiknock index', appropriately named. The antiknock index is derived from the MON (motor octane number) and the RON (research octane number). The formula that provides the number you see on the pump is (RON+MON)/2. Hope this helps, and saves you a little money.

P.S. You can be sure the dealer filled it with 87[img]i/expressions/face-icon-small-smile.gif[/img] How's the beast running, congrats on your new purchase! I got mine in January, just turned 800 miles today!

 

Run basic unleaded unless for some freak reason you have detonation. Your money is better spent other places than the fuel tank. Also, brand does not matter. The entire country runs off the same pipelines, so all fuel regardless of brand is basically the same. Shop for price, not the pretty picture on the sign. If you do a search on this topic you'll find a couple good ones that explain octane ratings and vehicle requirements.

 

LOL, or you could just read my post above.... btw knock=detonation .AJ is partially correct, go for the cheap stuff, but buy a well known brand- There are differences in additive packages after the fuel reaches the terminals from the pipelines and is branded. Ok folks, I'm outta here for a week, happy riding and posting!