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Not much will void your warrantee unless it causes damage to some part of the bike and then only what you caused damage to will not be warranteed if it was a job done by you incorrectly that caused the damage. This is a scare tactic by the dealers to make them do the work for you and you pay the bill.
I have been using the Rev Tech magnetic filters on my 99 Sportster 1200. The magnetic part sounds good, collecting all the metal particles.
Think of one thing when responding to the magnetic theory, how much of the engine is composed of a ferrous metal? (magnetic) You have alloys, brass and other metals that will swim right by the magnet. In theory , it sounds great but when you give it some thought, it only attracts a very small persentage of the problems that cause damage that are found in the oil.
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.