Can I do 91 octane for my new Stryker? - Yamaha Star Stryker Motorcycle Forum
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Old 04-27-2012, 01:06 AM   #1 (permalink)
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Default Can I do 91 octane for my new Stryker?

91 octane because I live in California, and I think other states have higher octanes. Its actually going to be the first time Im gonna fuel up my new stryker. The bikes manual says to go with regular unleaded only, but I wonder if supreme, or 91 octane will harm my engine in any way, short or long run?? I only do v-power on my F150 Harley and my Saleen mustang, but I really dont have a clue if its ok when it comes to this motorcycle..... Thank you guys...
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Old 04-27-2012, 01:36 AM   #2 (permalink)
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Default Re: Can I do 91 octane for my new Stryker?

I use 89 and it's better then the other gas because not only I get better gas miles but it runs more smoother...
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Old 04-27-2012, 08:50 AM   #3 (permalink)
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Default Re: Can I do 91 octane for my new Stryker?

I've only filled up once with less than 91 octane, and I've even run 93 a few times. In Wisconsin, 87 and 89 both have ethanol, and I was told by my dealer to avoid ethanol as much as possible.
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Old 04-27-2012, 09:09 AM   #4 (permalink)
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Default Re: Can I do 91 octane for my new Stryker?

Funny this should be asked. I just watched a news story on this yesterday. The answer is basically that you should use what the manufacturer recommends. As they said, the manufacturer has done all the testing and have determined what will work best in your vehicle. They also said that using the wrong octane could damage the motor and void your warrenty.
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Old 04-27-2012, 09:14 AM   #5 (permalink)
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Default Re: Can I do 91 octane for my new Stryker?

http://www.yamahastarstryker.com/ind...pic,424.0.html


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Old 04-27-2012, 09:19 AM   #6 (permalink)
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Default Re: Can I do 91 octane for my new Stryker?

Quote:
Originally Posted by bekohlko
I've only filled up once with less than 91 octane, and I've even run 93 a few times. In Wisconsin, 87 and 89 both have ethanol, and I was told by my dealer to avoid ethanol as much as possible.
You might want to check that the 91 and 93 you are using don't also contain ethanol. 10% ethanol in fuel adds 2 octane points to gasoline so these stations may stock what is an 89 octane + 10% ethanol to have a finished 91 octane. Same for the 93. 91 octane + E10 +93 octane.
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Old 04-27-2012, 09:32 AM   #7 (permalink)
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Default Re: Can I do 91 octane for my new Stryker?

There's no gain to running 91 just a lighter wallet after fill up, I use to run 91 when I first got my bike thinking it needed it. but then after a little research found out that 87 is just fine. Ive been averaging 43 mpg and a high of 47 mpg. I haven't had any problems no pinging or anything and bike seems to run just as good on 87 as it does 91. 10% ethanol fuel will not hurt these bike. They are designed around that fuel. You just wont see as good as gas mileage by about 1 to 5% since ethanol contains less energy than gasoline. But since im in California also its impossible to find a station that sells pure gas (there as bad as the drug dealers always cutting product with something cheaper).
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Old 04-27-2012, 09:38 AM   #8 (permalink)
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Default Re: Can I do 91 octane for my new Stryker?

89 octane and a little StarTron for the ethanol issues
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Old 04-27-2012, 11:40 AM   #9 (permalink)
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Default Re: Can I do 91 octane for my new Stryker?

87 Octane is what I use and what Yami recommends. Just pissing away money with anything higher. Also I put alittle seafoam in on occasion!
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Old 05-15-2012, 03:35 PM   #10 (permalink)
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Default Re: Can I do 91 octane for my new Stryker?

Quote:
Originally Posted by 11Stryker
87 Octane is what I use and what Yami recommends. Just pissing away money with anything higher. Also I put alittle seafoam in on occasion!
Here is some good info for example of what the main performance of different level octane is for.

Octane Quality and Vehicle Octane Requirement

Gasolines are most commonly rated based on their
Antiknock Index (AKI), a measure of octane quality. The AKI
is a measure of a fuel’s ability to resist engine knock (ping).
The AKI of a motor fuel is the average of the Research Octane
Number (RON) and Motor Octane Number (MON) as determined by the formula (R+M)/2. This is also the number
displayed on the black and yellow octane decal posted on the
gasoline pump. Optimum performance and fuel economy is
achieved when the AKI of a fuel is adequate for the engine in
which it is combusted. There is no advantage in using
gasoline of a higher AKI than the engine requires to operate
knock-free.
The RON and MON of fuels are measured by recognized
laboratory engine test methods. Results of these tests may
generally be translated into approximate field performance.
In general, the RON affects low to medium speed knock
and engine run-on or dieseling. If the Research Octane
Number is too low, the driver could experience low speed
knock and engine run-on after the engine is shut off.
The MON affects high speed and part-throttle knock. If
the Motor Octane Number is too low, the driver could experience
engine knock during periods of power acceleration such
as passing vehicles or climbing hills.
The antiknock performance of a fuel, in some vehicles,
may be best represented by the RON, while in others it may
relate best to the MON. Extensive studies indicate that, on
balance, gasoline antiknock performance is best related to
the average of the Research and Motor Octane Numbers, or
(R+M)/2.This formula is continuously reviewed for its accuracy
in predicting gasoline performance in new automobiles,
and is, in fact, currently being studied again because some
smaller displacement engines that are prevalent today respond
to octane differently.
The RON of a fuel is typically 8 to 10 numbers higher
than the MON. For instance, an 87 octane gasoline typically
has a MON of 82 and a RON of 92.

If you want to read more

http://ethanolrfa.3cdn.net/dd9e74ce1..._rbm6bdgh3.pdf
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