Author Topic: your thoughts on 87 octane gas  (Read 11547 times)

Rianna

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Re: your thoughts on 87 octane gas
« Reply #75 on: October 20, 2010, 11:31:06 PM »
My scooter runs on Italian Espresso. And when I add Seafoam, it's Capuccino.
That's great Emil! I love it!! :D

WT100

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Re: your thoughts on 87 octane gas
« Reply #76 on: October 21, 2010, 05:50:58 AM »
My scooter runs on Italian Espresso. And when I add Seafoam, it's Capuccino.
Nice!

Yager200i

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Re: your thoughts on 87 octane gas
« Reply #77 on: February 16, 2011, 06:14:44 AM »
It seems the Kymco manual states, "Use unleaded gasoline with a research octane number of 91 or higher."
 
The Research Octane Number (RON) is not what we use in the US, we use the Anti-Knock Index (AKI). There is also the Motor Octane Number (MON), further confusing the issue.
 
http://en.wikipedia.org/wiki/Octane_rating
 
In order to translate between RON (which the Kymco manual uses) and AKI (which US gas stations use), we have to do some math.
 
MON is a more stringent octane test than RON, so the MON will generally be 8-10 points lower than the MON.
 
So, we let this website do the calculations:
http://www.wolframalpha.com/entities/calculators/anti-knock_index/ra/6k/ue/
 
We know Kymco wants a RON of 91 or higher, so we plug that into the RON input on that page. We'll assume MON is 10 points lower than RON for this first run, so MON is 81.

The result is an AKI of 86. So, Kymco says with a RON of 91 and a MON of 81, we can run 87 AKI octane gas just fine (in other words, the 87 octane number as it shows at US gas pumps).
 
Let's do another calculation with the MON set 8 points lower than the RON.
That gives an AKI of 87. So again, we should be just fine running 87 octane gas in the scooter, according to the Kymco manual.
 
So, it would appear that running 87 octane (AKI) gas should be just fine for these scooters.
« Last Edit: February 16, 2011, 06:16:19 AM by Yager200i »

griffon_j9

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Re: your thoughts on 87 octane gas
« Reply #78 on: February 17, 2011, 02:34:27 AM »
I use the cheapest fuel there is ^_^ and everything I own works perfect on it ;)

now for the more pressing matters




simple yep thats me no fighting here.....  ::)
2010 Red Xciting 500RI  51 MPG so far

klaviator

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Re: your thoughts on 87 octane gas
« Reply #79 on: February 17, 2011, 03:23:34 PM »
If your bike runs fine on regular, then premium is a total waste of money.  I have only owned one bike that didn't run fine on regular.  My Super 8 does just fine on 87 octane.  The higher the octane, the more resistant to preignition the gas is, that's it.  There is no more energy in high octane gas.
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djrider

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Re: your thoughts on 87 octane gas
« Reply #80 on: February 22, 2011, 02:14:41 AM »
Wow! RON, MON, and AKI! You learn something everyday!
I've used the premium or higher octane gasoline in my motor bikes over the years will no ill effects and will continue to do so.
My experience has been that the bikes seem to start and run better on it! Was told the higher octane gas burns cleaner too but I never researched this myself.
You can use the 87 octane but I will stick to using 92 or 93 octane. Just my preference!


2009 Kymco People S 250
2001 Honda CR250R (son's)

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