What type of fuel, super or regular

[Edithnelson]

I have a 2010 FJR. What fuel should I e using. Regular or super

[ts3doug]

I only use super regular, except when I use regular super.

87 non ethanol has been fine for me, no pinging. And that's Iowa, if you live at any altitude 87 would definitely be fine.

[wpbfjr]

super.

save all your recipts.

it's the only way yammi will fix this f'd up motor.

[Queensland Ken]

No Ethanol fuel for my bike at all.
Bloody more and more servos selling the stuff here.

Here in Australia, I just use regular 91, as per owners manual, the fjr has only a low compression motor.
I think our octane rating system is different to the States.

[Mr Bill]

No Ethanol fuel for my bike at all.
I think our octane rating system is different to the States.

4-5 points difference. Really hard to find alcohol free fuel here.

My ktm with a very small gas tank takes 91, but if I go to a pump they all have one hose for all the octanes and what happens if the hose is full of regular from the person filling up before me? I need to pump at least a gallon to make sure the 93 octane I'm buying blends to 91 in my tank from who knows what is in the hose.

You can change the timing on the ktm with a switch to run on crap gas though. You can also cut the power in half with the same switch to make it run like a bmw.

[Bounce]

Yamaha calls for regular. It doesn't knock on regular. Use regular.

[Bugnatr]

Yamaha calls for regular. It doesn't knock on regular. Use regular.

Regular 87 octane.

In Uturd and Colorado they have 85 regular. My high performance 04 didn't like that stuff at all, it would stumble off the line.

[ts3doug]

I reckon in the mountains 85 would do for the feejer. Just a guess though.

[yamafitter]

My ktm with a very small gas tank takes 91, but if I go to a pump they all have one hose for all the octanes and what happens if the hose is full of regular from the person filling up before me? I need to pump at least a gallon to make sure the 93 octane I'm buying blends to 91 in my tank from who knows what is in the hose.

We have one gas station in town that has pumps with dedicated high octane gas (94) hose that is separate from the others. My WR450F does suffer if you don't use the good go juice so I fill my gas can at this station whenever possible. When I rode Copper Canyon it was not always possible to buy high test so I took a can of octane booster with me and I did not run into any problems with the bike. I believe Mexico gas does not have ethanol but given that we were pumping out of barrels on occasion it was impossible to know the quality of the fuel we were using.

The FJR on the other hand runs fine on regular which is rated at 87 octane here in the Great White North. I try to run some injector cleaner every once in awhile to help keep the injectors clean.

[Mr Bill]

We have one gas station in town that has pumps with dedicated high octane gas (94) hose that is separate from the others.

I wish we had one of those! When I fill the gas can I put a half gallon in the truck first to clean out the hose. I always buy Top Tier gas so I've not used fuel treatments in a long time.

KTM gets what gas I can find and now I'm thinking it won't hurt to run some cleaner for that injector.

[ts3doug]

Some places load up the lower selling grades tanks when prices drop, then the fuel will sit in the tank for quite a while. Try to know at least your home station well.

[HotRodZilla]

I have run as low as 85 in the high altitudes and usually run 87. I ran some 88 in my bike earlier this year when only 86 or 85 was available.

Didn't really seem to make a difference. The owner's manual says to run 87. There's no benefit to running higher octanes. The motor is not built to run better with them.

Why is this so hard for some to understand??

[ts3doug]

Bigger is not always better


My wife doesn't buy it either

[silverhound]

Have run only regular in my '08 since it was new. Back and forth across the US ran whatever octane was the "regular". Some areas it was 85 mostly 87. No problems.

[Old Michael]

I try to run some injector cleaner every once in awhile to help keep the injectors clean.

I thought the Canadian FJRs were all carbureted.
No?

[beemerdons]

I try to run some injector cleaner every once in awhile to help keep the injectors clean.

I thought the Canadian FJRs were all carbureted.
No?

I do believe you're correct on this Old Michael, I do know all of the Canadian FJR riders have gas; in yamafitter's case, garlic kielbasa gas and a lot of it!

[Intech]

I have used 87 ocatane from whatever station is convenient. Ethanol or not. Have not had any issues for 70k miles and average 42 mpg.

[Bounce]

https://en.wikipedia.org/wiki/Octane_rating" onclick="window.open(this.href);return false;

Higher octane ratings correlate to higher activation energies: This being the amount of applied energy required to initiate combustion. Since higher octane fuels have higher activation energy requirements, it is less likely that a given compression will cause uncontrolled ignition, otherwise known as autoignition or detonation.

The compression ratio is directly related to power and to thermodynamic efficiency of an internal combustion engine (see Otto-cycle). Engines with higher compression ratios develop more area under the Otto-Cycle curve, thus they extract more energy from a given quantity of fuel.

During the compression stroke of an internal combustion engine, as the air / fuels mix is compressed its temperature rises (PV=nRT).

A fuel with a higher octane rating is less prone to auto-ignition and can withstand a greater rise in temperature during the compression stroke of an internal combustion engine without auto-igniting, thus allowing more power to be extracted from the Otto-Cycle.

If during the compression stroke the air / fuel mix reaches a temperature greater than the auto-ignition temperature of the fuel, the fuel self or auto-ignites. When auto-ignition occurs (before the piston reaches the top of its travel) the up-rising piston is then attempting to squeeze the rapidly heating fuel charge. This will usually destroy an engine quickly if allowed to continue.

Fuels of different octane ratings may have similar densities, but because switching to a higher octane fuel does not add more hydrocarbon content or oxygen, the engine cannot develop more power.

so... as was explained (so many times in so many places) higher octane doesn't net you "more power" it simply retards early ignition. on engines designed to use higher octane (and knock sensors), they have to change their timing to prevent knocking (if a lower rated fuel is used) and, in the process, may lose some of their potential power. Engines designed for lower octane do not gain "extra special sauce" if given higher octane fuel and it might actually lead to less efficient burning and more fouling (as well as being a waste of money).

If it isn't knocking on regular, any higher octane serves no purpose, wastes money, and can cause issues.

[wpbfjr]

i have always remembered the term 'flame front' and octane related posts by 'jestal' on the fjrforum

http://www.fjrforum.com/forum//index.ph ... ntry359718" onclick="window.open(this.href);return false;

http://www.fjrforum.com/forum//index.ph ... ntry360278" onclick="window.open(this.href);return false;