In short, you can't tell when you need to change the fork oil unless you drain the oil out in which case you may as well change the oil anyway.

Most suspension people would recommend an oil change every 2 years or 25,000km or when your fork seals leak.

Guaranteed, your oil will now be a grayish colour with lots of wear particles in it. Nothing to be overly worried about but it will accelerate the deterioration of your slider bushes and fork seals.

Most slider bushes and seals will last in excess of 50,000km if the fork stantions are in good condition.

A fork oil change is not a hard job to do yourself so long as you have 2-3 hours spare, some oil, something to support your front end and a service manual.

Holding off the service for 2-3 months should not be a problem. I wouldn't lose any sleep over waiting.

 

+1 for Ralphus' comments.

I'd add that you'll need a lot of tools, and most importantly, a way to either hold the rear end of the bike down, or the front of the bike up when you take the forks tubes off.

I have an eyebolt threaded into my garage floor. Hook a ratcheting tiedown to it and the luggage rack, and Robert's your father's brother!

You can do a search on this site for the gory details of the job. Not much to it, but it does take a while.

 

Same response here. Allow yourself enough time to go about it quietly, maybe with a beer or two or a coffee or whatever. Taking off the fairing panels if you havent done this before is good as your get to understand a bit more of what you have got and how its put together. 'Crack' open the top spring retaining cap before you undo the triple clamp bolts. The lower triple clamp bolt is pretty vital hence I prefer to remove the fairing panels to get the best access to this to loosen and tighten. I reckon to drain and change the oil simply undo the top cap and invert each fork leg and allow to drain. I am a bit of an environmental vandal and I use fresh oil to flush out. I flush out till the discharge is clear, usually about 3 or so attempts. Then refill refit and as the others have said Robert is your Uncle.
If the suspension is standard and if you are happy with the suspension performance refill with 10wt fork oil (good quality) and maintain the required air gap when fully compressed with spring out. If you want to firm it up try the next wt oil, say 15wt, and a little less air gap, say 15mm less. This will harden the suspension a bit and also reduce dive under brakes a bit. Not a lot here, a little bit OK. Don't make the mistake of trying to measure the oil quantity, measure the air gap to the fork oil after you have 'worked' all the air bubbles out. New 'standard' oil at standard level probably won't offer any change in performance for normal riding.
Have fun and take your time.
Cheers, Simmo

 

As a general observation I would add that keeping fresh fluids in your bike is cheap insurance. Doing otherwise to "get your moneys worth" is a false economy.

 

Thanks for all the responses. While I do consider myself somewhat handy I dont think I can do this job, but more importantly just wanted to know if I was inflicting permanent damage by not doing so. I will most likely hold off for now as I have spent way too much $$ already and its only May. Thanks again!

 

Its not that hard to do. The main requirements are a bit of controlled space, ie in a garage or shed with the ability to put things here and there, and a bit of time. Fork oil, while it may be a tad expensive on a per volume rate, is relatively cheap for the volume you will use. Its good therapy.
Cheers, Simmo