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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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What is the highest oil temp a harley 103 engine can handle

Customer Question

What is the highest oil temp a harley 103 engine can handle before the engine is damaged?
Submitted: 9 years ago.
Category: Motorcycle
Expert:  Wayne S. replied 9 years ago.
Good day,

Probably the ideal oil temperature
range is about 210F to maybe 230F.
Many of the newer bikes run very
hot and get above 250F.

Most oils tend to start breaking
down around the 300F mark so
260F to 280F would be the maximum
for safety. If you can get it
down to 250F or less it will
be fine with occasional increases
over 250F tolerable.

Too cool is not good either
like 180F or less can prevent
the burn off of moisture and
other contaminants formed
by combustion.

Customer: replied 9 years ago.

What should i do to get the temp down ,I use synthetic with Lucas oil synthetic stabilizer, and currently purchasing an oil cooler.

Expert:  Wayne S. replied 9 years ago.

An oil cooler should do it and also
running your fuel mixture slightly
rich can help as lean fuel can
create more heat.

Avoid situations where the bike
is running but not moving like
heavy traffic during rush hour.
Don't let the bike sit and idle

Newer bikes are adjusted very lean
to meet emissions and consequently
run very hot.

I have seen bikes with little fans
added to blow air over the engine
or the oil cooler. These can
have a switch to turn them off/on.

Last resort, move to alaska, (bad joke)