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Ethanol in my Yamaha Gen

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Posted by Phil on May 11, 2009, 2:43 pm
    I have a Yamaha EF2400iS Generator , have used it for about four years
as a backup for my home electric , I used only 89 octane 100% gasoline but
now my supplier only has E10 and I am concerned about having problems with
my little 171 cc engine , I live in N.E. Ohio and believe that ethanol my
not be available , any thoughts on possible damage to engine / fuel system
and can I find a source for non Ethanol fuel.
Phil L.

Posted by z on May 11, 2009, 5:03 pm

I don't have any personal experience with that gen but when we switched
to ethonol in Oregon my honda eu2000i's never minded. Most of the issues
I had were with 2 cycle motors that had many many years of gunk built up
inside the gas tanks.  Like my old chainsaws.  The ethonol basically
cleaned out a bunch of crap that ended up in the carb etc.

If you are uber paranoid you could put an automotive fuel filter in line
and run it that way for a while to catch any gunk that might come lose,
but I'd be surprised if you have any issues beyond that

best of luck


Posted by Martin Riddle on May 11, 2009, 5:25 pm

Yes the Ethanol tends to loosen the rust inside gas tanks. If the tank
is not rusty then there no worry.
E10 was selected such that the 10% ethanol will have no effect on parts
and little on performance.
A little mixture tweak may be required.


Posted by vaughn on May 11, 2009, 5:32 pm

Read the book to be sure, but i would be shocked to hear that Yamaha made &
sold a generator that could not drink any common pump gas.

If you ever really do need non-ethanol gas, the place to get it would be a
small airport.  For a variety of reasons, most piston airplanes can't use


Posted by Frank on May 11, 2009, 5:50 pm
 Phil wrote:

Wondering about same thing.  I've been using it in my Power Boss
generator with no problem but I had left the gas with stabilizer in my
Troy Bilt snow thrower and I had to take it into the shop to have the
carburetor cleaned.  Reading the manual, they said not to use gas with
ethanol.  I'm still using it but now running the engine dry at the end
of the season.  Gas with ethanol is a more polar solvent and will attack
rubbers and plastics not affected by pure gas.  Eventually equipment
producers will uses seals, etc. unaffected by this E10 crap.

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