Question about 2006 Harley Davidson FLHR Road king

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Transmission hard to upshift when cold

I have a 2006 Road King with <40K miles that is difficult to upshift when cold. Although there is no significant increase in shift arm resistance, the "return spring" feel seems flat and doesn't provide the shift arm in the correct position for upshifting until it warms up in a few miles. After it's warm, all appears normal. Seems like the oil viscosity is now too high and overcomes any internal spring and/or there is too much internal drag until it warms up. Any thoughts on the cause/solution? I have fresh oil in the gearbox (although some evidence of water has entered due to a poor vent design...).

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Switch to Mobil 1 Syn gear lube 75w90 in the tranny.
Works very well in HD sure to drain and flush...a little water does a lot of harm.
Good luck with your bike...i hope this helps.

Posted on Jul 31, 2009


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2006 FLHRI Road King

Make sure you're using the correct weght for the oil for your area where you ride..the wrong oil can make your scooter run hot, so can being out of time..even by a few degrees.

When you check your oil is the bike warm or cold, and is it leaning or do you stand it upright?

Dec 31, 2008 | 2006 Harley Davidson FLHR Road king

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