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Wayne S.
Wayne S., Motorcycle Mechanic
Category: Motorcycle
Satisfied Customers: 1255
Experience:  Experienced and Licensed Motorcycle Mechanic - all sizes and brands welcome.
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I have a 2007 ktm 450 sxf I have spark but not running and

Customer Question

I have a 2007 ktm 450 sxf I have spark but not running and it looks as if I have fuel in my oil. I had to drain off oil to get back down to correct level
Submitted: 2 years ago.
Category: Motorcycle
Expert:  Wayne S. replied 2 years ago.

I would advise draining and replacing all your oil before running it anymore.
Fuel in the oil can damage the engine bearings.

Customer: replied 2 years ago.

yes I was going to drain and replace but I wanted to know why the fuel is getting into the oil as it will continue to contaminate the oil

Expert:  Wayne S. replied 2 years ago.
The problem is very likely the float needle valve in the carburetor
is either dirty or worn and leaking fuel into the engine.
Picture here:

If you blow lightly into the fuel line it might clear out
but if it is stuck bad or worn out it will need cleaning
or possibly replacement.

Normally the float would rise and the needle would shut
off the fuel flow into the carb but if not the float
bowl fills up until the fuel runs over into the engine.

A carb clean might solve any problems but check the
needle anyway to make sure it stops fuel when
the float is raised up.

Customer: replied 2 years ago.

I will pull out carbi and give a good clean and see how it all goes.

cheers ***** ***** help

Expert:  Wayne S. replied 2 years ago.
Okay, check the float needle and it should easily stop the fuel
when the float is raised gently.
Part number for new needle:
54631220000 FLOAT NEEDLE

Also, check the fuel tank tap or petcock valve and see
if it also stops the fuel flow properly when off.
Check that the fuel tank cap vent hose is clear.

Expert:  Wayne S. replied 2 years ago.
Just wanted to add that a small inline fuel filter can
help to keep the float needle clean. Most auto and
cycle shops have these available.
Just cut the fuel hose and put one inline unless
you already have one.