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Most, if not all, stock HD riser bolts are Grade 5 from the factory. On our Stealth Riser Extension Kits we include Grade 8 bolts.
If a bolt is over tightened it may fatigue the metal...it may hold for a while and then break later.
Read a very informative article by Brew Dude a month or so ago about how using loctite and/or lubricants WILL give a completely different reading when torquing to "spec".
I had an acorn nut fly off the windshield at about 70 miles an hour and it went by my face like a bullet if it had hit me i am sure there would have been a mess i probably would have went down. it just shot by like a bullet i could not believe it.
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.