what type of gasoline ?

[FJR2011]

Hi Guys,

I was reading the owners manual regarding gasoline and i am confused by what type i should use. It says "regular unleaded with a pump octane of 86 or higher", but then it also says "or a research octane number of 91 or higher"....so my question is; the Octane number indicated atthe pump is which ? all my buddies tell me to put the Super unleaded with the highest Octane...is that OK ?

Thanks for clarifying !

 

[TomInPA]

It's regular gasoline, generally marked on the pump as 87 octane, except in high altitudes where it is 85.

 

[DJB]

Pump Octane of 86 is the number on the pump. Research Octane is what they say it will run like. So for regular gas of 86 or 87 octane it has a RON of 91 to 93. This means that it will run and not knock like 91 to 93 octane gas. Understand that this is for unleaded gas. So if you buy 93 octane gas it anti knocks like 98 octane. So buy good gas at 87 octane and you will be ok. Hope this helps.

 

[RadioHowie]

Hi Guys,

I was reading the owners manual regarding gasoline and i am confused by what type i should use. It says "regular unleaded with a pump octane of 86 or higher", but then it also says "or a research octane number of 91 or higher"....so my question is; the Octane number indicated atthe pump is which ? all my buddies tell me to put the Super unleaded with the highest Octane...is that OK ?

Thanks for clarifying !

Feel free to pass a little info on to your buddies, courtesy of the FJR Forum:

"They're stupid and need to STFU!"

RON, or Research Octane Number of 91 is the same thing as "pump" octane of 87, which is what Yamaha recommends for the FJR.

If buying gas with an octane higher than RON 91 makes the buyer feel good about him/herself, and he/she doesn't mind spending 20 - 30 cents more more gallon, go for it.

But it ain't gonna make your Feej run any better.

 

[garyahouse]

Octane class 101

You'd be surprised how many think higher octane produces more power in EVERY engine. Octane is tricky to understand. Years ago, my autoshop teacher put it like this: Lead (shows how old I am) is like "slow 'em down juice." It slows down the explosion. It enables fuel to endure higher compression without self-igniting, and slows the flame front once it does ignite. Think of it like you're diluting the fuel. Truth is, higher octane = poorer performance, with one exception: the only time higher octane improves performance is when the engine's compression is too high for regular. In an engine where compression is too high for regular, the flame front moves through the combustion chamber too quickly, slamming the piston while it's still on it's way up, causing "knock." This is very destructive. It sounds like ping pong balls in the engine. Side note: if you give a hot FJR too much gas at real low RPMs, you'll hear this. It's loud, distinctive, and destructive. Anyway, higher octane slows down the burn, sorta calms down the gas. Truth is, it produces LESS power, ounce for ounce, than regular... in an engine designed for regular. Modern electronics make up for these issues and prevent knocking by altering timing and etc., but the result is the same. Use the lowest octane gas for the most power. Obviously there's a lot more to it than that, and I'm sure others on this forum can explain it better, but you get the idea. For what it's worth, adding anything to gas produces less power. Ethanol kills power as well, when mixed by the ECU at normal gasoline ratios (ECU, which stands for Engine Control Unit, controls the fuel injection ratios). That's why engines make less power and get poorer gas mileage when using higher ratios of Ethanol, like that found in E-85.

Gary

darksider #44

 

[ScottyUSN]

I have a car that requires 91 so I've pumped it into the bike out of habit a time or two with no benefit in performance or mileage increase. (A waste of money).

If possible avoid the ethanol supplemented stuff if you live in an area that offers both, that stuff does decrease MPG.

 

[wfooshee]

There's no such thing as "pump octane," or "what they say it runs like."

Resaerch Octane is one measurement system, and Motor Octane is another, generally 8 to 10 points lower for the same gas. US pumps display the average, which is where the (R + M) / 2 sign comes from. Most European countries use Research Octane only, which is why their numbers are higher than ours. It's the same rating. British 91 is US 87. British 95 is US 91.

Anything over "Regular" is a waste of money in your Feejer. If you insist on giving away money, I will ask you to kindly pump regular and send me the difference. PM me for my Paypal address.

 

[rfespinosa]

I use regular, that's what the manual calls for. At the pump, it's the lowest octane available, usually 87 octane. Using higher octane helps nothing on the FJR.

 

[Road_Runner]

Octane class 101

You'd be surprised how many think higher octane produces more power in EVERY engine. Octane is tricky to understand. Years ago, my autoshop teacher put it like this: Lead (shows how old I am) is like "slow 'em down juice." It slows down the explosion. It enables fuel to endure higher compression without self-igniting, and slows the flame front once it does ignite. Think of it like you're diluting the fuel. Truth is, higher octane = poorer performance, with one exception: the only time higher octane improves performance is when the engine's compression is too high for regular. In an engine where compression is too high for regular, the flame front moves through the combustion chamber too quickly, slamming the piston while it's still on it's way up, causing "knock." This is very destructive. It sounds like ping pong balls in the engine. Higher octane slows down the burn, sorta calms down the gas. Truth is, it produces LESS power, ounce for ounce, than regular... in an engine designed for regular. Modern electronics make up for these issues and prevent knocking by altering timing and etc., but the result is the same. Use the lowest octane gas for the most power. Obviously there's a lot more to it than that, and I'm sure others on this forum can explain it better, but you get the idea. For what it's worth, adding anything to gas produces less power. Ethanol kills power as well, when mixed by the ECU at normal gasoline ratios (ECU, which stands for Engine Control Unit, controls the fuel injection ratios). That's why engines make less power and get poorer gas mileage when using higher ratios of Ethanol, like that found in E-85.

Gary

darksider #44

You say "I'm sure others on this forum can explain it better.." but that's a pretty good explination Gary. I agree... more octane actually reduces performance and fuel economy slightly in a vehicle that does not need it, and costs more.

 

[Pepperell]

I have no data to prove it, but any ethanol sucks. My old chainsaw had it's rubber manifold eaten alive by it. Fortunately I located a NOS part for it. I'm convinced my bike runs the poorer for it. Sorry if I've hurt the feelings of you corn farmers out there, but making sweetener and feeding hogs is a much better use of the raw product IMHO. I would gladly pay ten cents more per gallon to NOT have it in my fuel.

 

[Intech]

I put aviation grade fuel in mine...and it flys!!

 

[LAF]

As Scotty said I have a car that is a Turbo that needs 91 at least and calls for 93 to make use of all of the Stage II Turbo.

I hate it, as just think how old that 93 is in the underground tanks.

I love the FJR uses 87 as it will be the freshest gas in the underground tanks.

I tried 89 and 91 for grins and giggles with lower mileage as a result.

The FJR is the bomb running like a rapped ape on 87.

 

[Larry33319]

Octane class 101

You'd be surprised how many think higher octane produces more power in EVERY engine. Octane is tricky to understand. Years ago, my autoshop teacher put it like this: Lead (shows how old I am) is like "slow 'em down juice." It slows down the explosion. It enables fuel to endure higher compression without self-igniting, and slows the flame front once it does ignite. Think of it like you're diluting the fuel. Truth is, higher octane = poorer performance, with one exception: the only time higher octane improves performance is when the engine's compression is too high for regular. In an engine where compression is too high for regular, the flame front moves through the combustion chamber too quickly, slamming the piston while it's still on it's way up, causing "knock." This is very destructive. It sounds like ping pong balls in the engine. Higher octane slows down the burn, sorta calms down the gas. Truth is, it produces LESS power, ounce for ounce, than regular... in an engine designed for regular. Modern electronics make up for these issues and prevent knocking by altering timing and etc., but the result is the same. Use the lowest octane gas for the most power. Obviously there's a lot more to it than that, and I'm sure others on this forum can explain it better, but you get the idea. For what it's worth, adding anything to gas produces less power. Ethanol kills power as well, when mixed by the ECU at normal gasoline ratios (ECU, which stands for Engine Control Unit, controls the fuel injection ratios). That's why engines make less power and get poorer gas mileage when using higher ratios of Ethanol, like that found in E-85.

Gary

darksider #44

One of the best explanations I have seen or read. Many yeras ago when I raced cars and gas was cheaper I tried Cam 2 racegas in a stock motor. On an engine dyno I found lower power and higher costs. Tried regular and power went up and my cost went down.Hieger compression = higher octane. The FJR is not a 15:1 motor.

 

[wheatonFJR]

Octane class 101

You'd be surprised how many think higher octane produces more power in EVERY engine. Octane is tricky to understand. Years ago, my autoshop teacher put it like this: Lead (shows how old I am) is like "slow 'em down juice." It slows down the explosion. It enables fuel to endure higher compression without self-igniting, and slows the flame front once it does ignite. Think of it like you're diluting the fuel. Truth is, higher octane = poorer performance, with one exception: the only time higher octane improves performance is when the engine's compression is too high for regular. In an engine where compression is too high for regular, the flame front moves through the combustion chamber too quickly, slamming the piston while it's still on it's way up, causing "knock." This is very destructive. It sounds like ping pong balls in the engine. Higher octane slows down the burn, sorta calms down the gas. Truth is, it produces LESS power, ounce for ounce, than regular... in an engine designed for regular. Modern electronics make up for these issues and prevent knocking by altering timing and etc., but the result is the same. Use the lowest octane gas for the most power. Obviously there's a lot more to it than that, and I'm sure others on this forum can explain it better, but you get the idea. For what it's worth, adding anything to gas produces less power. Ethanol kills power as well, when mixed by the ECU at normal gasoline ratios (ECU, which stands for Engine Control Unit, controls the fuel injection ratios). That's why engines make less power and get poorer gas mileage when using higher ratios of Ethanol, like that found in E-85.

Gary

darksider #44

This response should be put in FAQs about gas/octane. :clapping:

It was so simple to understand, even I got it.

 

[Larry33319]

Agree 110%.

 

[garyahouse]

I put aviation grade fuel in mine...and it flys!!

No Tech, ya got it all wrong. Ya put Baker AIR WINGS on an FJR to make it fly.

Gary

darksider #44

 

[HotRodZilla]

I put aviation grade fuel in mine...and it flys!!

No Tech, ya got it all wrong. Ya put Baker AIR WINGS on an FJR to make it fly.

Gary

darksider #44

Wait a second. I thought you were supposed to put SkooterG on an FJR if you want it to fly!

 

[wheatonFJR]

Wait a second. I thought you were supposed to put SkooterG on an FJR if you want it to fly!

Since we don't actually have documented photographic proof that skooter flew, I'm not so sure about that...although the ears look plenty capable of providing lift.

He could have tipped the damn bike over while nervously trying to pick up a hooker...as far as we know.

 

[RadioHowie]

I put aviation grade fuel in mine...and it flys!!

No Tech, ya got it all wrong. Ya put Baker AIR WINGS on an FJR to make it fly.

Gary

darksider #44

Wait a second. I thought you were supposed to put SkooterG on an FJR if you want it to fly!

:rofl: :rofl: :rofl: :rofl: :rofl: