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| techtalk:ref:susp08 [2025/03/18 19:20] – [JMC] hippysmack | techtalk:ref:susp08 [2025/03/21 17:38] (current) – [JMC] hippysmack | ||
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| 1989 XL883 with JMC Swingarm. ((photo by Dave83xlx of the XLFORUM https:// | 1989 XL883 with JMC Swingarm. ((photo by Dave83xlx of the XLFORUM https:// | ||
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| * **Part numbers for Sportster swingarms per CAS4 website**: ((http:// | * **Part numbers for Sportster swingarms per CAS4 website**: ((http:// | ||
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| - | * (JMC-A008000) - Fits 1999 and earlier EVO Sportster Style Frames, Eccentric Axle Adjuster. | + | * (JMC-A008000) - Fits 1999 and earlier EVO Sportster Style Frames, Eccentric Axle Adjuster. |
| - | * (JMC-A007000) - Fits Iron Head Sportster Style Frames, Eccentric Axle Adjuster. | + | * (JMC-A007000) - Fits Iron Head Sportster Style Frames, Eccentric Axle Adjuster. |
| * **Additional parts that were available as a special order option**: ((http:// | * **Additional parts that were available as a special order option**: ((http:// | ||
| - | | + | |
| - | * (JMC-P115) - Axle Adjuster. | + | * (JMC-P115) - Axle Adjuster. |
| - | * (JMC-200-WIDE) - Up to 200 series tire application (180 wide with belt). | + | * (JMC-200-WIDE) - Up to 200 series tire application (180 wide with belt). |
| - | * (JMC-EXT) - Up to 6" extension available. | + | * (JMC-EXT) - Up to 6" extension available. |
| - | * (JMC-ECC-TOOL) - Eccentric Axle Adjusting Tool (2 work best). | + | * (JMC-ECC-TOOL) - Eccentric Axle Adjusting Tool (2 work best). |
| * **Features**: | * **Features**: | ||
| - | | + | |
| - | * Raise your Bike for Handling. | + | * Raise your Bike for Handling. |
| - | * Direct Bolt on With no Modifications. | + | * Direct Bolt on With no Modifications. |
| - | * Add 2 Horsepower in Power to Weight Ratio. | + | * Add 2 Horsepower in Power to Weight Ratio. |
| - | * Made of 7020 Light Alloy for Superior Strength. | + | * Made of 7020 Light Alloy for Superior Strength. |
| - | * Show Polished and Ready to install. | + | * Show Polished and Ready to install. |
| - | * Race and Bearing Included. | + | * Race and Bearing Included. |
| - | * Accepts up to a 160 Tire Under a Stock Fender. | + | * Accepts up to a 160 Tire Under a Stock Fender. |
| * **Help for installation**: | * **Help for installation**: | ||
| * **Chain Adjustment**. The benefit of the eccentric chain adjusters is that chain adjustment is simple. Just undo the pinch bolts on both sides and rotate one of the eccentrics using the holes supplied to turn it. The other side will automatically change until the tension is correct. Then tighten the pinch bolts and job done. | * **Chain Adjustment**. The benefit of the eccentric chain adjusters is that chain adjustment is simple. Just undo the pinch bolts on both sides and rotate one of the eccentrics using the holes supplied to turn it. The other side will automatically change until the tension is correct. Then tighten the pinch bolts and job done. | ||
| - | Pics below with a 1989 XL883 by Dave83xlx. Click on a pic to enlarge: \\ {{: | + | Pics below with a 1989 XL883 by Dave83xlx. Click on a pic to enlarge: \\ {{: |
| - | Pinch area on this 1989 XL883, the left side was 0.239" and the right side was .204" \\ {{: | + | Pinch area on this 1989 XL883, the left side was 0.239" and the right side was .204" \\ {{: |
| - | * **Eccentric Adjuster Pinch Bolt Torque**. Since there isn't any instructions floating around, the torque on the these bolts has been a concern. The problem is you need the pinch bolt tight enough to stop eccentrics from moving under torque. But you don't want so much you risk causing pressure to crack the alloy arm. So Dave83xlx of the XLForum did some testing to find the results below using the existing bolts it came with. ((https:// | + | * **Eccentric Adjuster Pinch Bolt Torque**. Since there isn't any instructions floating around, the torque on the these bolts has been a concern. The problem is you need the pinch bolt tight enough to stop eccentrics from moving under torque. But you don't want so much you risk causing pressure to crack the alloy arm. So Dave83xlx of the XLForum did some testing |
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| - | {{: | + | App. Dims on swingarm for 1989 XL883: Click on pic to enlarge. \\ {{: |
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| - | App. Dims on swingarm for 1989 XL883: Click on pic to enlarge. \\ {{: | + | |
| * **Reviews** | * **Reviews** | ||
| * Some people argue that turning the eccentric adjusters moves the axle, changing ride height. But this is minimal and also it could be argued that slotted adjusters change length of bike. In my opinion, it is a good swingarm but there are some negatives. Technical information about these arms can be hard to find. Also it could be hard to replace things like eccentric adjusters if you damage them, being ham fisted. Please note I'm not a expert and these are only my opinions. ((Dave83xlx of the XLFORUM https:// | * Some people argue that turning the eccentric adjusters moves the axle, changing ride height. But this is minimal and also it could be argued that slotted adjusters change length of bike. In my opinion, it is a good swingarm but there are some negatives. Technical information about these arms can be hard to find. Also it could be hard to replace things like eccentric adjusters if you damage them, being ham fisted. Please note I'm not a expert and these are only my opinions. ((Dave83xlx of the XLFORUM https:// | ||
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