Differences
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techtalk:ih:engmech09s [2021/06/11 05:21] hippysmack [1957-1976 Factory Top Mount Assembly per Dr Dick] |
techtalk:ih:engmech09s [2023/12/27 22:42] (current) hippysmack |
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| **ASSEMBLY**: | **ASSEMBLY**: | ||
| - **Assemble the straddle to the heads**: | - **Assemble the straddle to the heads**: | ||
| - | * A 1/8" thick 1" dia. washer goes BETWEEN each head and the bottom straddle mount (1 on each end of the straddle mount). \\ Then the bolts (7/16"-20 X 7/8" bolts 5/8" hex size) get put in with no washers on the bolts (between the bolt heads and straddle). \\ The head is machined where this washer sits. The washer raises the strap above any unmachined nubs around the washer seat. ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1297584&page=63)) \\ It keeps interference at bay. If you look at the different strap profiles, you see the 1000 mount is also relived for nub clearance. \\ The 900 strap is not relived and when you see heads that are broke at the tapped hole, you will see most are 900. \\ Busting the mount lugs is because the washers are put on top smashing the strap into the nubs and splitting the head. | + | * A 1/8" thick 1" dia. washer goes BETWEEN each head and the bottom straddle mount (1 on each end of the straddle mount). \\ Then the bolts (7/16"-20 X 7/8" bolts 5/8" hex size) get put in with no washers on the bolts (between the bolt heads and straddle). \\ The head is machined where this washer sits. The washer raises the strap above any unmachined nubs around the washer seat. ((Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/127032-getting-this-78-back-to-the-way-it-should-be/page63?t=1297584&page=63)) \\ It keeps interference at bay. If you look at the different strap profiles, you see the 1000 mount is also relived for nub clearance. \\ The 900 strap is not relived and when you see heads that are broke at the tapped hole, you will see most are 900. \\ Busting the mount lugs is because the washers are put on top smashing the strap into the nubs and splitting the head. |
| * No washer between the bolt and the top of straddle mount. Both the versions of straddle mounts get assembled the same. | * No washer between the bolt and the top of straddle mount. Both the versions of straddle mounts get assembled the same. | ||
| - **The cross mount to straddle**; | - **The cross mount to straddle**; | ||
| Line 26: | Line 26: | ||
| * Now the nut on top. | * Now the nut on top. | ||
| - | {{:techtalk:ih:engmech:motor_mount_-_top_center_-_1960_xlch_by_dr_dick.jpg?direct&400|}} ((photo by Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1802776)) | + | {{:techtalk:ih:engmech:motor_mount_-_top_center_-_1960_xlch_by_dr_dick.jpg?direct&300|}} ((photo by Dr Dick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/167889-auction?t=1802776)) {{:techtalk:ih:engmech:top_mount_hole_compilation_from_vintage_parts_suppliers_and_rusty_dust_motorcycle_parts.jpg?direct&300|}} (( photo combined by Hippysmack, cropped from photos courtesy of Vintage Parts Suppliers [[https://www.ebay.com/str/vintagepartssuppliers?_trksid=p2047675.l2563|Link to Ebay Store]] and Rusty Dusty Motorcycle Parts [[https://www.ebay.com/str/bialystreasures?_trksid=p2047675.l2563|Link to Ebay Store]] )) \\ |
| - | {{:techtalk:ih:engmech:top_mount_hole_compilation_from_vintage_parts_suppliers_and_rusty_dust_motorcycle_parts.jpg?direct&400|}} (([[https://www.ebay.com/str/vintagepartssuppliers?_trksid=p2047675.l2563|Link to Ebay Store]] and Rusty Dusty Motorcycle Parts [[https://www.ebay.com/str/bialystreasures?_trksid=p2047675.l2563|Link to Ebay Store]] )) \\ | + | |
| + | {{:techtalk:ih:engmech:motor_mount_-_center_straddle_mount_1974_xlh_pic2_by_the_doctor71.jpg?direct&300|}} ((photo by The Doctor71 of the XLFORUM)) {{:techtalk:ih:engmech:motor_mount_-_center_frame_mount_1971_xlch_by_the_doctor71.jpg?direct&300|}} ((photo by The Doctor71 of the XLFORUM)) \\ | ||
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