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FORK OIL CHANGE?

Prior to my Indian & the Victory Cross Country I owned my Kawasaki Nomad for 12 years & never changed the fork oil.

Polaris built bikes have their fork oil changed as part of the 24000 kilometer service. 

I really don't understand why.

Can anyone explain why fork oil would need to be changed at 24000 service? 

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11 Comments

I am not a mechanics bootlace, but someone once explained to me that as the fork oil is compressed it deteriorates and absorbs air. This results in reduced viscosity and increased compressability. Hence no softening or rebound.

I believe!!!!!

Now whose a guru !

Obviously the bloke Phil heard it from...Lol!
But it does makes real good sense Phil!

Viscosity-the state of being thick, sticky, and semifluid in consistency, due to internal friction. Forks moving at up to 2 meters per second, springs compressing and decompressing. Heat from the friction. Metal particles being produced.
All the little wizardneers get paid to figure out wear rates. The fork oil is subject to much of the same affects as engine oil with certain exceptions and they don't have filters.

It is so the Dealer shop can make money off the work. They probably can go longer without the change, but the designers and engineers made them to last just so long. I would search for discussion on the Internet discussing the forks and problems with for your specific bike. If they're not leaking oil and performing satisfactory, I wouldn't worry about it. But if you take your bike to the dealer for maintenance, let them do it.

PHIL: I'm impressed ,, It gets dirty as well from all the compression and rebounding. There is a wear sleeve at the bottom of most tube forks. This wear ring wears out and lets the inner slide wobble back in forth side to side stuff. This leads to more wear and less shock damping. If the valving get damaged due to the iron shavings in the fork oil from wear. Then you get to replace that.

I change my fork oil around 30-40,000 miles. Oil is cheap shocks are not. If the shocks are working good then just let them go. You will know when they don't work you will get a wobble in the front when braking hard. This is no fun when it happens.

This Is one of those things that are not a major concern for me. Maybe the dealer needs some extra $$$

Its very interesting to hear riders opinions on this subject.
Most people have said they don't change their fork oil unless they are leaking and obviously they have to change the seals at the same time.
(I've asked about this on other forums).
The only riders that claim to change the fork oil are mechanics.

Matt. I do. If i buy a second hand bike I change all fluids so i can track servicing records.

Oh I agree with you 90% on that Phil.
The 10% being Ive only had the fork oil changed on the XC unless the forkseals were leaking.

That is interesting Phil, I agree with changing all fluids, engine, brakes and diff but for whatever reason the forks never cross my mind.probably due to the long service intervals generally specified for them, but does make sense.

Dub. It costs very little except time, too.

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