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I'm looking into doing something to my RK it's been lowered so I have that strike, but it's not a terrible bad ride, except on a pot hole or hard bump at speed on the freeway, but any improvement would help, time to change the fork oil which might help some, so I thought since I had to take so much apart I might look into doing some springs or something.
Short lengths of PVC are old school tech to increase spring preload. Low tech, but works and is very cheap. Get a couple of feet of PVC pipe and cut 2 pieces at 1/2", 2 @ 3/4" and so forth. You can play with the amount of preload until the ride is right. What I don't understand is their advice to use heavier oil. A heavier weight fork oil will slow down the first compression (bump), but it will also slow down the recovery (rebound). On a rough road the rebound gets behind the compression far enough and pretty soon you are locked down at the bottom. What increasing the preload will do is reduce your static sag (free compression of the springs that happen when the bike isn't moving). I'm not sure how increasing preload will fix a damping problem.
Unfortunately stock Harley's are equipped with only marginal suspension. Lowering one of them by reducing suspension travel is not normally going to improve the ride. Good luck.
That sounds like what's going on with 09's bike, or possibly the amount of oil is incorrect (too little or too much) the heavy SE fluid is too thick or some valves or dampers are trashed up. Temperature can also affect the fluid flow through the valving and dampers as well, also one must make sure there is no binding to the fork sliders and the fork tubes are true in the runout amount (straightness), and as said the suspension is marginal at best, now y'all have me thinking about my forks!!!
Oh, and while I really dig the vid of the squid on the SV650 plowing the tree - you should really think about it a little deeper:
Rider with no helmet who obviously doesn't know how to ride running off of the road into a tree. Sounds a lot more like your typical Harley rider than your usual sport biker.
Anyway, here's the video I had originally posted. It's Lee Shierts running a 7 second pass on a GSX-R1000. Your real moto-aficionados will appreciate it.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.