EVO: Suspension - Sportsterpedia

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====== EVO: Suspension ======


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====== Swingarm ======


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===== Rigid Mount Bikes =====

86-88 models are shown to have two bearings and 89-03 models with only one bearing in the catalogs. \\
However, two bearings are used in 86-03 Sportster swingarms and they are both installed on the right side pivot.  ((1986-1988 HD Sportster Parts Catalog 99451-88 pg 67)) ((1986-1989 HD Sportster Parts Catalog 99451-89 pg 69))  ((1986-1990 HD Sportster Parts Catalog 99451-90 pg 69)) ((1991 HD Sportster Parts Catalog 99451-91 pg 61)) ((1991-1992 HD Sportster Parts Catalog 99451-92 pg 63)) ((1993 HD Sportster Parts Catalog 99451-93 pg 63)) ((1993-1994 HD Sportster Parts Catalog 99451-94 pg 63)) ((1995 HD Sportster Parts Catalog 99451-95 pg 61)) ((1995-1996 HD Sportster Parts Catalog 99451-96 pg 65)) ((1997 HD Sportster Parts Catalog 99451-97 pg 65)) ((1998 HD Sportster Parts Catalog 99451-98 pg 67)) ((1999 HD Sportster Parts Catalog 99451-99 pg 73)) ((2000 HD Sportster Parts Catalog 99451-00A pg 73)) ((2001 HDSportster Parts Catalog 99451-01A pg 75)) ((2002 HD Sportster Parts Catalog 99451-02 pg 75)) ((2003 HD Sportster Parts Catalog 99451-03 pg 75)) \\
Both left and right sides were described as having bearings until the 2000 parts book came out correctly describing the left side as having a bushing. \\
The part number for the bearing (set) changed in 2000 from (47082-81) to (48367-98). \\
According to the pics on the [[https://www.jwboon.com/index2.php?co...rtster/Page_15|JW Boon]] website for NOS parts, even though the part number changed for the right bearing, it appears to be a place of origin change. \\
Both part numbers refer to a 'Timken LM11749' bearing: (47082-81 made in Poland) and (48367-98 made in USA). ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5790716#post5790716)) \\
The Prefix designates the duty class: LL - Lighter than Light; L - Light; LM - Light Medium; M - Medium; HM - Heavy Medium, H - Heavy ((https://www.motionindustries.com/productDetail.jsp?sku=00657537)) ((photo by spibbie of the XLFORUM, annotated by Hippysmack http://xlforum.net/forums/showthread.php?t=1861454&page=2)) {{ :techtalk:evo:susp:2002_swingarm_2_by_spibbie.jpg?direct&350|}}

**Swingarm with bearing(s) and bushings**. \\

|**Note**: Inspect pivot shaft and swingarm bearings every 5,000 miles. \\ Lube swingarm bearings every 10,0000 miles. ((1998 HD Sportster FSM pg 1-2))||||
| **REAR FORK WITH RIGHT BEARING** || **LEFT BUSHING** | **RIGHT BEARING ONLY** |
| 1986-1987 XLH 883/DLX \\ XLH 1100 | 47532-86 | (1) 47083-81 | (2) 47082-81 \\ (Timken LM11749) \\ Poland PC X0242 ((https://www.jwboon.com/index2.php?content=https%3A//www.jwboon.com/dbhtml/catalog/Bool_AND/Section_frame/Fits_Sportster/Page_15)) |
| 1987 XLH 883 Hug \\ 88 - all | 47547-87 | ::: | ::: |
| E1989 - all | ::: | ::: | ::: |
|L1989 - all |47566-89| ::: | ::: |
|1990 - all |47547-89 \\ (retro to L89)| ::: | ::: |
|1991- 1994 - all|47547-87A| ::: | ::: |
|1995-1998 - all |47547-87B| ::: | ::: |
|1999 - all |47547-87B| (1) 47083-81A  | ::: |
| 2000-2003 | 47587-00 | ::: | (2) 48367-98 \\ (Timken LM11749) \\ USA PS ((https://www.jwboon.com/index2.php?content=https%3A//www.jwboon.com/dbhtml/catalog/Bool_AND/Section_frame/Fits_Sportster/Page_15)) |


**Swingarm related parts** \\

|  **Pivot Bolt**  |  **Pivot Bolt Screw**  |**Bearing Dust Shield** (2-right)|  **Pivot Bolt Spacer**  |  **Swingarm Hole Plug**  |
| 86-88 (41568-86) \\ all models |86-88 (2892) \\ all models|86-03 (41579-81) \\ all models|86-03 (5741) \\ all models|86-96 / 99-03 (740) \\ all models|
| 89-90 (41568-89) \\ all models |89-92 (2925) \\ all models|  |  |97-98 (761) \\ all models|
| 91- 92 (41568-89A) \\ all models |93-03 (2925A) \\ all models \\ 3/8" Allen head|
| 93-03 (41568-81B) \\ all models (1" hex head bolt)\\ includes pivot bolt screw & spacer |






===== Rubber Mount Bikes =====
For the 2004-later models, the swingarm uses a bearing in each side and the assembly is part of the motor mounting system as well. \\
See [[techtalk:evo:susp05#rubber_mount_engine_mounts|Rubber Mount Engine Mounts]] in the Sportsterpedia for assembly including the swingarm. \\

| **REAR FORK WITH 2 BEARINGS** ||  **LEFT OR RIGHT BEARING ONLY**  ||
| 2004 | 47587-04 |  9209  ||
| 2005-2018 | 47587-05A | ::: ||

2004 swingarm and bearings from an 883. \\
{{:techtalk:evo:susp:04_883_swingarm_15_by_dede.jpg?direct&400|}} ((photo by DéDé of the XLFORUM http://xlforum.net/forums/showthread.php?p=5770909)) {{:techtalk:evo:susp:04_883_swingarm_16_by_dede.jpg?direct&300|}} ((photo by DéDé of the XLFORUM http://xlforum.net/forums/showthread.php?p=5770909)) \\


Notes gathered from the XLFORUM: \\

 
  * There is a pivot shaft that supports the swing arm bearings/bolts on the outside, and goes through the rear mounting lug on the tranny case. If the pivot shaft is loose in the rear mount lug, it will need to be replaced. ((XLXR http://xlforum.net/forums/showthread.php?t=1526368&highlight=motor+mounts&page=3))
  * Symptoms of swingarm problems: ((Loony http://xlforum.net/forums/showthread.php?t=1526368&highlight=motor+mounts&page=3))
    * Excessive play in the rear wheel, difficulty keeping in a straight line in slow moving traffic. 
    * Spherical Bearings having play in them.
    * Rear rubber mounts well out of shape. 
    * Torx bolt head shearing off.
  * All of the rubber mounts are open to this problem... Because of the fact that the swing arm is mounted to the mount... An it's rubber-mounted with a spherical bearing... It's got some "flex" stock most don't notice it... Till its really bad! ((04xl1200c http://xlforum.net/forums/showthread.php?t=1526368&highlight=motor+mounts&page=3))

  * Replace the swing arm bearing when you have it apart... and above all else... follow the TSB for reinstalling the rear brake don't cross thread the pivot bolt. ((04xl1200c http://xlforum.net/forums/showthread.php?t=1526368&highlight=motor+mounts&page=6))


  * When you have the swingarm out, use a few sockets and some all thread (a bolt could work as well) in a vise to press the bearings out. ((Screw Loose Dan http://xlforum.net/forums/showthread.php?postid=5569081#post5569081))  There might be some surface rust in there, just soak it with some rust solvent for a couple of hours before you press it. ((madlim http://xlforum.net/forums/showthread.php?postid=5569081#post5569081))




**Broken Pivot Bolts**:

  * I think the design issue is that the pivot shaft is too small for the hole it goes through in the engine. It should be a tighter fit like an axle through a bearing. The purpose of the lock plate is to keep the pivot shaft from spinning so you can tighten the swingarm bolts. I think it does that job just fine. But, because the pivot shaft is too small, when you install the lock plate, the lock plate centers the pivot shaft in its hole. So the engine transmits its forces not directly into the pivot shaft, but rather into the lock plate bolts, then into the lock plate, then finally into the pivot shaft. Those little lock plate bolts cant handle that kind of stress so one or two of them break. I think a better fix would be a larger pivot shaft, or a shim or bushing of some sort to take up the space between the pivot shaft and its bore. ((Rog48 http://xlforum.net/forums/showthread.php?t=1526368&highlight=motor+mounts&page=12))
  * I agree that a tighter pivot shift fit would help but the plate also holds against lateral shift of the shaft to the left under hard cornering loads. The combination of that force plus wiggling of the shaft in the motor opening definitely contributes to the problem ((LuxBlue http://xlforum.net/forums/showthread.php?t=1526368&highlight=motor+mounts&page=12))


If you are replacing the bearings, it's worth reading this extensive thread about replacing the engine rubber mounts: http://xlforum.net/forums/showthread.php?t=1526368








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