View Full Version : Using old 2 stroke fuel

Nick Long - n/a
9-May-06, 09:28 AM
There seem to be various views on whether fuel, especially 2 stroke mix, goes off over a long period.

I had a couple of jerry cans of 2 stroke left over from July 2005 and I used them at Magnolls Farm the other week with no apparent problems. I've even had a look inside the engine since.


tonybroad - n/a
9-May-06, 09:47 AM
You'll have to get up earlier in the morning to catch me out Nick...

win a race meeting, tell everyone you use old fuel from last year, others follow suit thinking it's the reason you're so quick when all the time you actually use super-duper high octane additive rich mega fuel, mixed under controlled conditions and delivered fresh to your door the evening you set off for a race meeting

i might be losing my hair but i'm not stupid http://hovercraft.org.uk/images/icons/smiley_icons/icon_lol.gif


Nick Long - n/a
9-May-06, 09:59 AM
Really, Tony, all I did was mix it 50:50 with new stuff. And that wasn't controlled conditions; I just topped up the tank from alternate jerry cans.


J Bucknall - n/a
9-May-06, 11:58 AM
Nick is quite right

old fuel is fine

just give it a good shake

we used our old fuel with out even diluteing it and there were no problems didnt even get rid of the stuff in my tank that was Vented.

(sciencey bit from the guys in the next office who make bp-ultimate)

over time the portion of the fuel that evaporates is the more volatile fraction this is the part that leads to knock preignition etc. so overtime the fuels octane rating can actually improve. although oxidization of the fuel can lead to higher gum/tar content.

there you go no myth left http://hovercraft.org.uk/images/icons/smiley_icons/icon_biggrin.gif

John B

Nick Long - n/a
9-May-06, 12:39 PM
just give it a good shake

Even that gets done for you: 200 miles on the trailer.


Keith Oakley - n/a
9-May-06, 06:20 PM
Surprised that someone in deepest Somerset hasn't come up with a clandestine plant to turn old 2 stroke fuel into cooking oil.

Michel - n/a
9-May-06, 11:04 PM
For 1 year old, 50 / 50 is a good way, I ' ve let old ( very old ) 2 stroke mix in my moped for long, and I ' d obtained no stroke anymore. Just good to wash paint brushs.

In case you intend to let your fuel in tank for long, they sell a special stabilizer, a bit expensive, but it keeps all qualities for more than a year.