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Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders Discuss Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders problems, advice, and/or how tos.

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  #41  
Old 18th October 2014
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Thanks Cosmo for the pics. Gives a better understanding of the design, especially since my service manual has not arrived yet.
And thanks to xlxr for referencing his sticky, which I will print out for my installation of a full ricor set up this winter. One of our group owns an 07 R and he says his bike is scary above 90. I don't have enough miles on my 08 to fully evaluate its stability. Nothing like my buddy mentions about his 07 for sure.
I looked at my 02 swing arm set up and it is mounted to the frame, not the motor. The distance between the 02 front mounts is greater than the distance of the rubber mount. Like if you hold a broom stick out parallel to the ground using on hand vs two outspread hands. Seems inherently unstable, but just an unengineered guess.
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  #42  
Old 19th October 2014
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Quote:
Originally Posted by Folkie View Post
If the shocks are 11" long then the belt is at (or very close to) its tightest* with the shocks uncompressed, and gets looser under compression. With the long shocks (13¼", say), the belt is not at its tightest with the shocks uncompressed, and gets tighter under compression. If the shocks compress enough to go past the tightest point*, then the belt gets looser again.

*: with the tranny sprocket centre, swing arm pivot, and rear axle centre in a straight line.
That coincides with what I found checking the tension after going to 12" from 11" shocks on my Nightster. I expected to have to loosen then belt, with weight on the bike, but not so. It was fine. It got looser with a riders weight.
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  #43  
Old 19th October 2014
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Quote:
One of our group owns an 07 R and he says his bike is scary above 90.
My 2006 Roadster is stable to 100 mph, which I rarely do except for tests. I consider 100 mph the limit of safety of the rubber mount design, and that applies only to the Roadsters with full length suspension properly set up. If you want to go faster than that, there is a very long list of bikes that are far more comfortable at 100 and above.
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  #44  
Old 19th October 2014
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My 04 has been over 100 numerous times with no issues. Maybe I've got a Monday model?
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  #45  
Old 20th October 2014
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While my first rubber mount Sporty did jump a little sideways twice, I'm now on my second one, and other than those 2 times they are both very stable at 100mph ... or more. Though I might hesitate to do a 100mph sweeper on one, at my age I probably wouldn't want to do that on a Ninja either.
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