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yz400f fuel
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Posted by: motofox2006---------------------
What was the original fuel a 1999 YZ400f was designed to run on. Thanks all.
Posted by: Rich Rohrich---------------------
Premium pump fuel.
Posted by: motofox2006---------------------
Premium but do you know if thats 98 premium octane or 96 or 91 i really dont know.
Posted by: Rich Rohrich---------------------
The Yamaha minimum requirement is 95 RON. It's common for US fuel to have a 10 point spread between the RON and MON ratings (called the fuel's sensitivety), so some quick math (R+M) / 2 gives us:
( 95 RON + 85 MON ) / 2 = 90 pump octane or AKI
So essentially any pump premium (93-91) in the US will "technically" satisfy the minimum octane requirement of 95 RON.
Outside of the US the number at the pump is RON, so the numbers are larger but the fuel has the same basic octane rating when compared using the same test methods.
Posted by: motofox2006---------------------
Whats RON and are you saying i should use 91 octane, thanks.
Posted by: Jaybird---------------------
What he clearly said was that the bike mfg suggests a 95 octane fuel if the rating of the octane is provided with the RON number.
If your fuel station has a sign showing the octane rating of the fuel, it will probably have, in small print, a note stating how they arrived at that octane rating.
If they used just the RON value of the fuel, it will more than likely say 95 RON.
Here in the US, we take the average of two different measures. Both the RON and MON numbers are added together and then divided by 2 to give us our octane rating.
It is a safe bet that you need to use the highest octane rated fuel that your automobile gasoline station provides. Here in the US we have used different terms over the years to describe the higher octane rated fuels. Premium, High-Test, Ethyl...are all busswrods for the higher octane fuel at the pump.
If all that fails, buy the most expensive at the pump.
Posted by: APBT---------------------
RON= Research octane
MON= Motor octane.
They are derived by different methods.
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