I have a 2003 SWing. Got it when it had 17,000 miles on it this summer (San Francisco area) and now it has 18,000 - have enjoyed every mile. Don't have prior service records but the bike seems as if was well maintained by PO. But, it has some suspension issues.
1. On new/smooth asphalt it purrs along at any speed and runs true with no vibration, sway, or wobble. It has the stock windshield and I get buffeted a lot - but the bike stays rides true.
2. On many concrete freeways that are not that rough (no big pits or surface breaks), but that are not perfectly smooth (but a bit undulating), it starts to oscillate up/down a bit at 50mph, much more at 60mph, and it really gets to bucking up/down at 70mph (I won't ride these highways as truck turbulence coupled with the SWing ride dynamics is truly scary).
3. When you ride along and hit a little bump - no problem - big bump (say 1-1/2 inch rise when crossing bridge abutment) and it sends quite a jolt up the forks to the handle bar.
4. When cornering/turning at slow speeds (15-20mph) the tire seems skittish/wobbly on the road as if the tire is momentarily loosing contact then reattaching itself. I have yet to try cornering at higher speeds with some serious lean as I don't yet trust that there will not be a problem based on its low speed performance. The dealer checked out my tires (front and rear) and pronounced them in good shape with lots left on the tread.
5. When I sit on the bike and push down (with my feet on the ground and I weigh 180 pounds) the forks drop about 3/4 inches, when I hold the front brake and rock it up/down it seems to drop down about 1 inch and come back up (past the point neutral point) 1/2 inch for a total up/down of 1-1/2 inches. This does not sound like a lot - but when you are on the bike rocking it, it feels very soft and seems as if it has a lot of 'soft' travel. I have tried this on another 2003 SWing with identical mileage - and that SWing feels just like mine.
6. When I do U turns there seems to be a bit of a wobble (not much) - just not smooth (this may be due to my lack of technique).
7. I have not yet lifted the front end up to see if there is any fork play (fore/aft or left/right) - but there does not feel as if there is play (but there is a feel of some flex).
I have researched all of the posts (that I found) dealing with fork oil, springs, etc - but I still have a few questions.
a) Is my SWing front normal for year mileage?
b) Will changing fork oil likely have any impact? Could my oil be bad with so few miles on it? If so, what weight oil? My riding will be in the range of 55 to 100 degrees Fahrenheit (mostly in the 70 to 90 range).
c) Will the HyperPro springs solve any of my issues? Will they create an unduly hard feel to any parts of my ride? I don't want to end of with a real stiff bike that transmits a lot of force back through the bars. Are there any springs that I should consider that may be less costly (or better)? The HyperPro springs are listed as $170 on their website - can I get a better price/discount elsewhere?
d) Any other suggestions?