The Sportster and Buell Motorcycle Forum - The XLFORUM®
 

Go Back   The Sportster and Buell Motorcycle Forum - The XLFORUM® > SPORTSTER MOTORCYCLE FORUM > Sportster Motorcycle Era Specific and Model Specific > Ironhead Sportster Motorcycle Talk (1957-1985)
XLF Blogs XLF Arcade XLF Disclaimer/Privacy Statement/Terms Of Use

Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

Active Threads
0 2009 XB12R make over.
Last Post: salmanmr
Posted On: 2 Minutes Ago
Replies: 11
Views: 6,762
0 Proper XLCH
Last Post: Magneto Sportster
Posted On: 12 Minutes Ago
Replies: 95
Views: 17,528
0 1972 Build thread please subscribe
Last Post: Gold Member
Posted On: 15 Minutes Ago
Replies: 64
Views: 3,623
0 Another Wrap Post
Last Post: Ireeman
Posted On: 15 Minutes Ago
Replies: 5
Views: 118
0 Top mount steering damper?
Last Post: salmanmr
Posted On: 19 Minutes Ago
Replies: 9
Views: 2,529
0 What a birthday I've had
Last Post: Ireeman
Posted On: 29 Minutes Ago
Replies: 43
Views: 1,173
0 Need some guidance on installing a traxxion dynamics suspension on my front forks
Last Post: Maxeffort
Posted On: 42 Minutes Ago
Replies: 2
Views: 55
0 Ignition swap (compatibility?)
Last Post: Maxeffort
Posted On: 48 Minutes Ago
Replies: 6
Views: 125
0 Problems relocating coil
Last Post: sportsterdoc
Posted On: 1 Hour Ago
Replies: 8
Views: 187
0 Keep & Kill
Last Post: Crusty
Posted On: 1 Hour Ago
Replies: 17,443
Views: 1,009,888
0 Transformer XR1200
Last Post: wedge
Posted On: 1 Hour Ago
Replies: 402
Views: 44,157
0 Ironhead carbs
Last Post: Ferrous Head
Posted On: 1 Hour Ago
Replies: 9
Views: 263
0 ....1
Last Post: Graywolf
Posted On: 1 Hour Ago
Replies: 5,544
Views: 323,406
0 "03 vs 04+ Cylinders & Heads: Different Carb Bracket?
Last Post: screndname
Posted On: 2 Hours Ago
Replies: 5
Views: 169
0 Gearing Help
Last Post: BigMek
Posted On: 2 Hours Ago
Replies: 3
Views: 57
0 Snippets
Last Post: Crusty
Posted On: 2 Hours Ago
Replies: 150
Views: 13,470
0 baker 6 in 2000 883 conversion primary vent drips
Last Post: Randy_rots
Posted On: 2 Hours Ago
Replies: 2
Views: 35
0 Fixing Digital Gear Indicator
Last Post: IXL2Relax
Posted On: 2 Hours Ago
Replies: 1
Views: 101
0 Hottie of the day, no nudity.
Last Post: trainman
Posted On: 2 Hours Ago
Replies: 19,942
Views: 2,030,785
0 Top end failure
Last Post: Mission1
Posted On: 3 Hours Ago
Replies: 10
Views: 233
0 Info needed on mini sumps.
Last Post: Ferrous Head
Posted On: 3 Hours Ago
Replies: 19
Views: 653
0 Graduated to Ironhead
Last Post: Highly-Dangerous
Posted On: 4 Hours Ago
Replies: 13
Views: 261
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: trainman
Posted On: 4 Hours Ago
Replies: 47,706
Views: 7,636,852
0 Inherited Ironhead
Last Post: Highly-Dangerous
Posted On: 4 Hours Ago
Replies: 8
Views: 130
0 yost power tube guy
Last Post: Ferrous Head
Posted On: 4 Hours Ago
Replies: 26
Views: 1,107
0 FDR Drive pothole did this...if u can believe it
Last Post: Ireeman
Posted On: 4 Hours Ago
Replies: 14
Views: 668
0 Looking for an xlch engine
Last Post: Medyo Bastos
Posted On: 4 Hours Ago
Replies: 0
Views: 39
0 Chinese S&S carbs
Last Post: Ferrous Head
Posted On: 4 Hours Ago
Replies: 11
Views: 498
0 dieseling ? solenoid ? help
Last Post: doodah man
Posted On: 4 Hours Ago
Replies: 6
Views: 135
0 41mm V-Twin Narrow-glide conversion for XL
Last Post: keithnh
Posted On: 4 Hours Ago
Replies: 12
Views: 527
More...
Members Birthdays
Tags
33.4mm, fork tubes, front end

Reply
 
Share Thread Tools Display Modes
  #1  
Old 1st November 2018
Old Junk Old Junk is offline
XL FORUM TEAM MEMBER
 
Join Date: Mar 2009
Location: 2 blocks from Juneau Plant!
Posts: 22
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1969
Sportster/Buell Model #2: XLH
Sportster/Buell Year #2: 1971
Other Motorcycle Model: XLCR Tribute
Other Motorcycle Year: 1980
Reputation: 10
Old Junk is an unknown quantity at this point
Default QLong-winded question: what length should my front fork tubes be?

Long time lurker, now with a big question. I'm putting together a '69 XLCH. Not exactly stock, there's a mix of reconditioned junk, nos, aftermarket, swap meet pickings, etc.

The nos frame and swingarm have been painted & assembled, the wheels are ready to be mounted, and I've got people much smarter than me (my local indie) trying to put the front end together so that this can be a roller. I bought a Frankenstein front end from ebay and I'm trying to get it back to stock, with the rubber boots/gators.

Here's the trouble: The fork tubes (22 3/4" long repops purchased from Fleabay) seem too long once assembled in the lowers; the fork gators are stretched out WAAAY too much to look normal.

My indie shop is great - they do lots of old Harley stuff, but mostly work on big twins. They have a stock, unmolested '69 XLCH for comparison. Side by side, seems like my re-assembled front end is about 4" too long compared to the stock '69 front end.

I don't have any photos. Sorry, I know that's stupid.

I've seen a few threads on 33.4mm tubes. I remember reading about TWO part numbers for two different fork tubes with DIFFERENT LENGTHS from this era. But of course I can't find that thread now...

Lowers seem to be correct. Tubes seem to be correct. Springs and guts seem to be correct.

Could it be that my fork tubes are too long at 22 3/4"?

Or does this front end need to be put under load somehow to fit together properly?

Or is there some other explanation of why the front end seems too long?
Reply With Quote
  #2  
Old 1st November 2018
72 Ironhead XLH's Avatar
72 Ironhead XLH 72 Ironhead XLH is offline
Senior Master Custom Bike Builder
 
Join Date: May 2005
Location: NJ
Posts: 5,914
Sportster/Buell Model: XLH
Sportster/Buell Year: 72
72 Ironhead XLH has disabled reputation
Default

22 3/4 would be the correct length. are there any pipe spacers above the springs?https://www.bikernet.com/pages/Fork_...imensions.aspx
Reply With Quote
  #3  
Old 1st November 2018
JonesL JonesL is offline
XL FORUM TEAM MEMBER
 
Join Date: Dec 2013
Posts: 628
Sportster/Buell Model: XL
Sportster/Buell Year: 1971
Reputation: 371802
JonesL has a reputation beyond reputeJonesL has a reputation beyond reputeJonesL has a reputation beyond reputeJonesL has a reputation beyond reputeJonesL has a reputation beyond reputeJonesL has a reputation beyond reputeJonesL has a reputation beyond reputeJonesL has a reputation beyond reputeJonesL has a reputation beyond reputeJonesL has a reputation beyond reputeJonesL has a reputation beyond repute
Default

With the bike fully assembled, the front end ought to settle quite a bit. Short of simulating the weight of engine/trans plus full gas tank and rider. not sure there's a way to tell for a roller chassis.
If your shop guys are sharp and are assembling with OEM or at least OEM dimensioned parts, then you should at least be in the ball park.
My book shows the lowers as one choice, only difference is left or right side.
The uppers are 45953-68 SLIDER TUBE (2) (high road clearance)(standard) 68-70 XLH, XLCH.
or 45955-68 SLIDER TUBE (2) (low road clearance)(optional) 68-70 XLH.
Hope this helps.
__________________
"If a camel flies, no one will laugh if it doesn't get very far".
Reply With Quote
  #4  
Old 1st November 2018
IXL2Relax's Avatar
IXL2Relax IXL2Relax is offline
XL FORUM TEAM MEMBER
 
Join Date: Feb 2013
Location: Let Freedom Ring in PA
Posts: 7,574
Sportster/Buell Model: Sportster 883►1200
Sportster/Buell Year: 1994
IXL2Relax has disabled reputation
Default

In Damper Tube forks, the length of the upper slider & the length of the damper tube determine the maximum possible length from the top of the slider to the axle...

Since the damper tube slides down into the upper slider and mounts to the BOTTOM inside of the lower slider, this sets the maximum length. The only other factor is if you have top out springs between the damper tube HEAD and the BOTTOM of the lower slider... but this will shorten the overall length of the slider/damper rather than extend it...

In some lowering kits, extra top out springs are used to reduce the distance the damper extends below the bottom of the upper slider - but that also reduces the overall fork suspension travel...

IXL _______ >>>> My Motorcyle Chronicles Are Here<<<<
For FREE Sportster Tech Info, catalogued from the XLForum,
Check Out The Sportsterpedia
__________________
### The ride is more enjoyable to nowhere in particular! ###
Reply With Quote
  #5  
Old 1st November 2018
Bob F's Avatar
Bob F Bob F is offline
XLF LIFEMEMBER Im retired
 
Join Date: Feb 2007
Location: Pittsburgh, PA
Posts: 14,407
Sportster/Buell Model: XL50 0596 Black
Sportster/Buell Year: 2007
Other Motorcycle Model: E-Glide
Other Motorcycle Year: 2003
Reputation: 886328
Bob F has a reputation beyond reputeBob F has a reputation beyond reputeBob F has a reputation beyond reputeBob F has a reputation beyond reputeBob F has a reputation beyond reputeBob F has a reputation beyond reputeBob F has a reputation beyond reputeBob F has a reputation beyond reputeBob F has a reputation beyond reputeBob F has a reputation beyond reputeBob F has a reputation beyond repute
Default

Quote:
the fork gators are stretched out WAAAY too much to look normal.
Buy ones that fit. About $6 at auto parts stores.

Or here: https://www.ebay.com/sch/i.html?_fro...cat=0&_odkw=sc
__________________
Bob, a glutton and a winebibber, a friend of bartenders and sinners!
Reply With Quote
  #6  
Old 1st November 2018
Old Junk Old Junk is offline
XL FORUM TEAM MEMBER
 
Join Date: Mar 2009
Location: 2 blocks from Juneau Plant!
Posts: 22
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1969
Sportster/Buell Model #2: XLH
Sportster/Buell Year #2: 1971
Other Motorcycle Model: XLCR Tribute
Other Motorcycle Year: 1980
Reputation: 10
Old Junk is an unknown quantity at this point
Default Thanks

Wow! Thanks for coming through, everyone. I'll share this info with my indie and see if it helps.
Reply With Quote
  #7  
Old 1st November 2018
IronMick's Avatar
IronMick IronMick is offline
Rider Of The Iron Steed
 
Join Date: Dec 2003
Location: London, ON Canada
Posts: 32,359
Sportster/Buell Model: XLH
Sportster/Buell Year: 1978
Reputation: 1079207
IronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond repute
Default

The very best choice for boots for Sportster 35mm forks is the Honda GB500 part number 51611-KN8-003. They actually fit perfectly. Most others will not fit the 35mm dimension. Get them at your local Honda dealership.Any motorcycle shop should also be able to order them.
__________________
Mick
IronHead Forever!

Visit Mick's WebSite
[And Check Out My Autobiog]
Reply With Quote
  #8  
Old 1st November 2018
brucstoudt's Avatar
brucstoudt brucstoudt is offline
Senior Master Custom Bike Builder
 
Join Date: May 2010
Location: Pottstown PA.
Posts: 13,792
Sportster/Buell Model: xlch
Sportster/Buell Year: 1960
Reputation: 457092
brucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond repute
Default

you can get the correct ones from an H-D dealership IMG_0038 (1) by Bruce Stoudt, on Flickr p/n 46001-54 it's on the package but not easy to read. these are for the early 33.4 mm forks.1969 included.
__________________
72 1000cc barrels and heads, s&s 41/2'' flywheels, sifton cams, s&s super B w/ zippers thunderjet w/yost powertube, andrews gears,and shafts, competition engineering kevlar wet or dry clutch, 72 oil pump, morris magneto w/auto advance and single fire module, cycle electric generator w/electronic regulator,73 cu.in.
Reply With Quote
  #9  
Old 2nd November 2018
IronMick's Avatar
IronMick IronMick is offline
Rider Of The Iron Steed
 
Join Date: Dec 2003
Location: London, ON Canada
Posts: 32,359
Sportster/Buell Model: XLH
Sportster/Buell Year: 1978
Reputation: 1079207
IronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond reputeIronMick has a reputation beyond repute
Default

Quote:
Originally Posted by IronMick View Post
The very best choice for boots for Sportster 35mm forks is the Honda GB500 part number 51611-KN8-003. They actually fit perfectly. Most others will not fit the 35mm dimension. Get them at your local Honda dealership.Any motorcycle shop should also be able to order them.
Ooops, I saw 1979 in the post header, did not notice the question is about 1969.
Reply With Quote
  #10  
Old 3rd November 2018
Magneto Sportster's Avatar
Magneto Sportster Magneto Sportster is online now
Master Custom Bike Builder
 
Join Date: Jun 2005
Posts: 3,287
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1969
Sportster/Buell Model #2: XLH
Sportster/Buell Year #2: 1960
Other Motorcycle Model: XLCH
Other Motorcycle Year: 1959
Reputation: 326811
Magneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond reputeMagneto Sportster has a reputation beyond repute
Default

The forks will sag when the engine is in the frame and everything is on the ground. That's probably why the complete bike looks different
__________________
"Ride 'em, don't hide 'em!"
Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT +1. The time now is 03:13.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC