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Remove the tank from the bike, then the petcock from the tank. Depending on how dirty the tank is, you may simply need to flush with water. If necessary, I sometimes add a squirt of engine degreaser, and flush again with clean water. I then take my time to remove all water from the tank using a wet / dry shop vacuum.
Depends on how bad it is inside. Lots of vids on You Tube showing how to & what to use, depending on if it's just old gunk & bad gas or if it's rusted inside.
If you're referring to flushing out a bad liner... Do... Not... Bother. Just went through this and tried every suggestion on the forum. Get another tank on eBay if your liner is bad
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.
