What Fuel

[peterscotts]

what fuel should you use in your GS 500... Normal unleaded or premium 95 or 98 octane?

[Zethioth]

It was designed for normal unleaded.

The other fuels won't hurt however.

[slipperymongoose]

First up welcome.

Second: please use the search function on this topic and you will find a plethora of threads.

Thirdly: in short it doesn't matter use what makes you happy long as its unleaded its good for the GS.

[peterscotts]

OK.. Thanks for that, was thinking the better fuel would make it run smoother , help engine last longer plus better fuel economy.

[slipperymongoose]

Like I said use the search function and you will see all you'll ever need to know about what you just asked. Fuel and oil threads are a bit of a social no no cause these subjects have been debated and flogged like a dead horse

[peterscotts]

Sweet!

[weedahoe]

I use 93 because I keep extra cans full of fuel and my truck is custom tuned for 93. I rarely go to a fuel station but if I do, then I will add 89. I never put 87 in anything.

[peterscotts]

Thanks weedahoe!

[wayne242]

I'm cheap but not to cheap, i always hit the middle one

[POL3ND]

There's a sticker under my seat, on top of the rear tire well, that recommends I use 91 octane

[peterscotts]

Fair enough!

[rharding91]

I use 93 because I keep extra cans full of fuel and my truck is custom tuned for 93. I rarely go to a fuel station but if I do, then I will add 89. I never put 87 in anything.

Took this off web

Octane is the level of energy the fuel contains it is an additive put in gas at the refinery.

this is going to sound weird but it is true here we go.

87 octane regular gas explodes easier than 91 octane.

However 91 octane contains more energy once it has been exploded, this is why if you have a pinging vehicle when you hit the gas or go up hills they say use 91 octane. The Gas is harder to make ignite in the cylinder than the 87 therefor eliminating the ping or pre ignition.

Any vehicle can run on the higher octane fuel with no problems at all, however if the vehicle was meant to run on 87 octane you are more or less wasting money putting in the higher octane gas. That said if you are having pre ignition issues with the engine or pinging going up hills pulling etc... you may need higher octane gas to eliminate this but only for that reason.

The simple answer look in the owners manual of the vehicle and it will tell you what octane level of gas your car needs.

[Suzuki Stevo]

I just looked in the Owners Manual for my 2013 WR250R....Yamaha sez Premium? I guess it's pumped up enough to need it?
Hummm...runs pretty good on Regular 

[gsJack]

From 89-00 Shop Manual.  87 pump octane=91 research octane



http://img.photobucket.com/albums/v443/jcp8832/CountryorAreaSymbols.jpg

[weedahoe]

I use 93 because I keep extra cans full of fuel and my truck is custom tuned for 93. I rarely go to a fuel station but if I do, then I will add 89. I never put 87 in anything.

Took this off web

Octane is the level of energy the fuel contains it is an additive put in gas at the refinery.

this is going to sound weird but it is true here we go.

87 octane regular gas explodes easier than 91 octane.

However 91 octane contains more energy once it has been exploded, this is why if you have a pinging vehicle when you hit the gas or go up hills they say use 91 octane. The Gas is harder to make ignite in the cylinder than the 87 therefor eliminating the ping or pre ignition.

Any vehicle can run on the higher octane fuel with no problems at all, however if the vehicle was meant to run on 87 octane you are more or less wasting money putting in the higher octane gas. That said if you are having pre ignition issues with the engine or pinging going up hills pulling etc... you may need higher octane gas to eliminate this but only for that reason.

The simple answer look in the owners manual of the vehicle and it will tell you what octane level of gas your car needs.

Thats very true but again, my truck is custom tuned by DiabloSports because I have the engine/transmission modifications that need this custom tuning. I have a custom cam, my heads are shaved, ported and polished, my intake is matched to the heads, true custom cold air intake, my Intake Air Sensor is tricked, my throttle body is ported and polished, my clutch fan was replaced with an electric fan, I have a different oil pump to keep pressure at higher RPMs, my entire ignition setup is different.  My transmission has had a lot of upgrades as well as my rear end with gears and LSD. I took out the brake booster and exchanged with with a hydro boost off a diesel to keep brakes due to the low vacuum my cam provides. I can go on and on.

Like I said, I only put 93 in my bike because I have spare cans of fuel in the shop. Its easier for me to top off my tank here at home than to pull in a gas station.

I have said before out engines are very simple and do not require higher fuels. I mean hell, we still have carbs!

[pliskin]

2 words..ethanol free. If you can use ethanol free gas. Google it.

[gsJack]

My tale of octanes, gas knocks, and oil grades.

I had four 400-750cc Hondas I used 10W-40 oil winters and 20W-50 summers after they had some milage on them for the 230k miles I put on them.  When I got the 97 GS new I ran 15W-50 Mobil I full synthetic for about 50k miles after break-in.  After all 5 (4 Hondas and 97 GS) got 10-20k miles or so on them getting carboned up they developed gas knock in hot weather under load so I used mid range gas in them summers to eliminate the knock.  When oil consumption increased I replaced the more expensive Mobil I with the 15W-40 heavy duty aka diesel oil and then one hot summer day I inadvertantly filled it with regular 87 octane gas and it never knocked.  And it never knocked again for the next 30k miles I put on it with the 15W-40 oil.  My 02 GS has gone all of it's 90k+ miles on 15W-40 oil and regular 87 octane gas without a single knock.

Conclusion:  A 89-02 GS500 runs cooler on 10/15W-40 oil than on 15/20W-50 oil, no doubt in my mind.  Never had a 04 or later model with an oil cooler so I can't vouch for them but I would run the same in them myself.

[yamahonkawazuki]

Sweet!

then you get jumped on by the search button nazis lol. higher octane fuels. do one thing. ( and its not make more power. the higher octane rating is its resistance to detonation. lower compression engines have no need for it. but as others have said, if you wish to use it, have at it my friend .

[Twisted]

What fuel? Is this the new "What oil"? thread?

[codajastal]

What fuel? Is this the new "What oil"? thread?

yep