100% 91 PON Gasoline vs. 87 PON E10 Ethanol Blend - Page 2 - Honda CBR250R Forum : Honda CBR 250 Forums
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post #11 of 16 Old 10-24-2017, 07:08 PM
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Back in the 1990's MTBE was in use many parts of the Rocky Mountain West. I lived in Minnesota at the time and I recall making snowmobiling trips out to Colorado in late winter/early spring, and noticing the exhaust from vehicles had a peculiar, rather noxious smell. It was very noticeable when driving through the Denver area, and I remember thinking at the time that those vehicle emissions can't be good.

I must have a fairly sensitive sense of smell when it comes to fuel... I can discern the difference between an engine burning an E10 blend, and one that is running on 100% gasoline.

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post #12 of 16 Old 10-24-2017, 07:22 PM
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dave searles comment on 87pon/low compression
and clean ignition does not apply to our 10.7:1 cr..
owner manual specifies; "Your motorcycle is designed
to use research octane number (RON) 91 or higher."

while most modern road motorcycles have 10:1 to 12:1 cr,
royal enfield bullet '500' single for eg, has 8.5:1 cr
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post #13 of 16 Old 10-24-2017, 07:28 PM
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As shisoshin points out, the key words in the CBR250R Owner's Manual regarding minimum recommended fuel octane are "or higher".

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post #14 of 16 Old 10-24-2017, 08:12 PM
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Seems that an aspect of this E10 vs. Non-ethanol gas debate which is often overlooked, is frequency of use.

As Honda states in the O/M, the fuel system is designed & manufactured using materials to tolerate E10. I'd tend to think that this is also based on a bike that is being operated on a regular basis. In other words, if your 250R is a daily rider and you're going through the better part of a tank of fuel every week, you're probably less likely to have issues as a result of using E10 during the riding season.

In my case, none of my bikes (or any of the other small engine equipment I own) are used on a regular or daily basis, so for me using only non-ethanol gasoline year round is a no brainer.
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post #15 of 16 Old 10-25-2017, 09:56 AM
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Gas with ethanol can experience what is called "phase separation" (PetroClear - Understanding the Dangers of Phase Separation in Ethanol Blends).

Basically holding excessive amounts of water and breaking down into 2 layers. That can happen at any time during production, transportation, or storage.

That means you can get "bad" gas right at the station and it will not last as long as gas without ethanol.
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post #16 of 16 Old 10-27-2017, 02:48 AM
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storage tanks have different level meters at bottom
for measuring levels of ethanol blend fuels, in inches,
to measure the fuel level, above the water level..

ie, beyond pr etc, industry recognises that water
will/does get into storage tanks..

before you start pumping into your, tank..
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