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Old 11-08-2012, 11:05 PM   #1 (permalink)
IronButt
 
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Krowbar wants to know Dino or Syn?
New 35mm Fork Tubes Require different Lower Bushings! Need Help!

So, Someone prior to me stuck 27 3/8" forks on my new FXRS. I wanted stock trail so I bought used 35mm 25 3/8" forks. My old set use the same lower bushings that are shown in my 85 FXR manual. The forks have a bout a 1" step down to put the 1" lower bushing in. My new forks have a much smaller step down than my 27" forks. The "divet," if you will, is only about 1/8 inch if that. Any suggestions to where to buy a new lower fork bushing for this set-up?

These are the lower parts of my new tubes.

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1985 FXRS: Dyna 2000 ICM, Twin Tec II Single Fire, Mikuni HSR 42mm carb, S&S intake, Progressive 11.5" rear springs, progressive front sprigs, SPF Lightningheader exhaust and bars, rebuilt front forks with brace (lowered back to 25.5"), Arlen Ness fairing, all new electrical, shyt-ton of powder coating etc. etc.
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Old 11-09-2012, 12:00 AM   #2 (permalink)
IronButt
 
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Krowbar wants to know Dino or Syn?
So, I looked back at the ad for my new forks, and they say they fit '75-'83. Will these tubes fit my '85 fork sliders? I hope so, I really need these to work! haha
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1985 FXRS: Dyna 2000 ICM, Twin Tec II Single Fire, Mikuni HSR 42mm carb, S&S intake, Progressive 11.5" rear springs, progressive front sprigs, SPF Lightningheader exhaust and bars, rebuilt front forks with brace (lowered back to 25.5"), Arlen Ness fairing, all new electrical, shyt-ton of powder coating etc. etc.
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Old 11-09-2012, 09:06 AM   #3 (permalink)
IronButt
 
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lucille wants to know Dino or Syn?
Is it too late, or too expensive to up-grade to a 39mm fork setup?
In the end, you'll end up with a stronger, more versatile front end?
Hope you can get things sorted out ......
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Old 11-09-2012, 10:48 AM   #4 (permalink)
IronButt
 
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Unfortunately, I don't think you can mix and match. I think you need to get the correct tube for the model year (what I really mean is match the tubes to the sliders). I attempted to mix n match damper rods between years because I had this and that laying around, and founf that the parts are simply NOT interchangeable.


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Old 11-09-2012, 10:58 AM   #5 (permalink)
IronButt
 
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Krowbar wants to know Dino or Syn?
I was considering 39mm front end, just have friends who have dealt with both and truly say the difference is not all that significant with proper upgrades to the 35mm forks. Regardless, I invested in the 35's enough to not warrant 39mm upgrade. Also, 39mm weren't too expensive, but finding a dual disk set-up was, with the 11.5 rotors and all that.
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1985 FXRS: Dyna 2000 ICM, Twin Tec II Single Fire, Mikuni HSR 42mm carb, S&S intake, Progressive 11.5" rear springs, progressive front sprigs, SPF Lightningheader exhaust and bars, rebuilt front forks with brace (lowered back to 25.5"), Arlen Ness fairing, all new electrical, shyt-ton of powder coating etc. etc.
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Old 11-09-2012, 11:03 AM   #6 (permalink)
IronButt
 
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Krowbar wants to know Dino or Syn?
According to some guy on JP cycles said my sliders should work with these fork tubes.
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1985 FXRS: Dyna 2000 ICM, Twin Tec II Single Fire, Mikuni HSR 42mm carb, S&S intake, Progressive 11.5" rear springs, progressive front sprigs, SPF Lightningheader exhaust and bars, rebuilt front forks with brace (lowered back to 25.5"), Arlen Ness fairing, all new electrical, shyt-ton of powder coating etc. etc.
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Old 11-09-2012, 11:09 AM   #7 (permalink)
IronButt
 
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And to be honest, although 4 measly mm's, I like skinny front ends. I dunno why. I absolutely HATE Wideglides. Too gaudy. Must be that Northern Cali Frisco style that I grew up with.
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1985 FXRS: Dyna 2000 ICM, Twin Tec II Single Fire, Mikuni HSR 42mm carb, S&S intake, Progressive 11.5" rear springs, progressive front sprigs, SPF Lightningheader exhaust and bars, rebuilt front forks with brace (lowered back to 25.5"), Arlen Ness fairing, all new electrical, shyt-ton of powder coating etc. etc.
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Old 11-09-2012, 04:24 PM   #8 (permalink)
IronButt
 
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lucille wants to know Dino or Syn?
A = pi x radius x radius ...... You'll find that that 4mm difference is in actuality 20% larger.
39 mm narrow glide forks were the 'standard' for the Sportsters, Dyna-Glides, FXR's etc.
A single disc 39 mm is easy to convert to dual disc, and not too expensive either. Good luck with your project.
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