That 09' CRF450 is a real winner huh

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http://www.motocrossactionmag.com/ME2/d ... D2FEEEFDFC


I HAVE GASOLINE IN MY 2009 CRF450 CRANKCASE
IS THIS A MAJOR PROBLEM? IS THERE A FIX?




Dear MXA,
I am a concerned 2009 CRF450 owner. I have read and trusted MXA's
input for over 20 years. Have you had any issues on your test bikes with
gas in the engine oil? Is the EFI leaking fuel into the cylinder after
it is shut down? I heard of this gas causing engine damage. Can I ride
my bike without fear of it blowing up?

MXA talked to Honda several times on this matter and Honda is aware
of the fact that on some bikes gasoline has migrated to the crankcase
(not the transmission). MXA has not had this issue on our test bikes,
but yours is not the first letter we have received on the subject.

Honda says that there is no danger, as long as you drain and change
your oil at regular intervals. They think the problem is caused on shut
down when the fuel injector shoots (or dribbles) excess fuel into the
combustion chamber. As the engine is being shut down, a small amount of
gasoline makes its way past the rings and down into the crankcase. It is
never enough gas to cause any trouble, but over time, the small amounts
of gas can add up.

This wasn’t as much of problem on a carbureted bike as with fuel
injection, but Honda doesn’t know why.

As long as you change the oil at regular intervals, the accumulation
of fuel will not be a problem. Additionally, if you ride the bike very
hard or very long to get it up to temperature, the gas will evaporate
(although not all of it). Many riders also report a thin fluid of oil on
the outside of the engine cases—this is common for riders on long trail
rides (not so much motocross).

Honda did tell us that they do not recommend installing any kind of
one-way valve in the gas cap vent hose.

The gas cannot cause trouble to your crank or rod as long as it
doesn't exceed 15 percent of the gas/oil ratio. In summary, if you
change the oil often enough to avoid it collecting in quantity, this
will be a non-issue. Changing the oil is good advice for all four-stroke
owners, whether they have issues with moisture or gas collecting in the
bottom end or not.