Quote:
Originally Posted by dswansbiker
I've heard before that some of the dealers have a cool piece of apparatus that sucks the old fork oil out and replaces it with new through the drain hole. This sounds like a good way to go if there is such a thing. Anybody know for sure?
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This works great on older bikes with air forks. I did this every 10k miles on my '96 RK and the entire job took about 20 min. I used a $10 venturi vacuum device from Harbor Freight Tools that connects to an air compressor to create a vacuum. Just plug it into the schrader valve (valve removed) to apply the vacuum.
I don't see an advantage to using this method with newer bikes, as you'd still need to remove the top plug to release the vacuum in the fork, and if it's already off you might as well install the new oil from the top. If you could seal the opening you could apply the vacuum from the top and suck it through the drain plug as with the older bikes, but again I see no advantage to going to the extra effort.