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| techtalk:ih:oil03u [2025/07/18 14:44] – [1988-up XR-750 Oil Pump] hippysmack | techtalk:ih:oil03u [2025/10/21 03:14] (current) – [1988-up XR-750 Oil Pump] hippysmack |
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| Below is a pic showing the difference in teeth angles. | Below is a pic showing the difference in teeth angles. |
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| {{:techtalk:ih:oil:half_speed_vs_quarter_speed_oil_pump_drve_gears_by_thefrenchowl.jpg?direct&600|half_speed_vs_quarter_speed_oil_pump_drve_gears_by_thefrenchowl.jpg}}((pic by The French Owl of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/203311-nos-cases#post4542140)) | {{:techtalk:ih:oil:half_speed_vs_quarter_speed_oil_pump_drve_gears_by_thefrenchowl.jpg?direct&600|half_speed_vs_quarter_speed_oil_pump_drve_gears_by_thefrenchowl.jpg}} ((pic by The French Owl of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/203311-nos-cases#post4542140)) |
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| ====== 1970 XR-750 Oil Pump ====== | ====== 1970 XR-750 Oil Pump ====== |
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| ====== 1988-up XR-750 Oil Pump ====== | ====== 1988-up XR-750 Oil Pump ====== |
| | The original 1988 oil pump body was made out of magnesium and later it was made out of aluminum but the part number for the body stayed the same. The part number for the pump assembly did change from 26203-88R to 26203-88RA at least by 2002. However, the only part number that changed between the two assemblies was the 1/4" return outlet fitting from 62570-83 to 25259-93A. \\ |
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| * Pump speed is 1/2 of engine speed. | * Pump speed is 1/2 of engine speed. |
| * Return to feed ratio is 4:1. | * Return to feed ratio is 4:1. |
| |45830-48|62570-83|25259-93A|63541-74R|26227-58|11159|:::|||| | |45830-48|62570-83|25259-93A|63541-74R|26227-58|11159|:::|||| |
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| Pump Body 26217-88R \\ | Below is the magnesium pump body (26217-88R) and parts including the covers and gears. ((pics by Flattracker94 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/xr-sportster-motorcycle-talk-xr750-xr1000-xr1200/xr-750/187566-xr750-engine-from-rag-to-ripper/page4)) \\ |
| This is just the body without upper and lower covers. ((photos courtesy of ROBERT EVANS)) \\ | |
| {{:techtalk:ih:oil:xr-750_oil_pump_body_26217-88r_pic1_by_robert_evans.jpg?direct&300|}} {{:techtalk:ih:oil:xr-750_oil_pump_body_26217-88r_pic2_by_robert_evans.jpg?direct&300|}} {{:techtalk:ih:oil:xr-750_oil_pump_body_26217-88r_pic3_by_robert_evans.jpg?direct&300|}} \\ | |
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| {{:techtalk:ih:oil:xr-750_oil_pump_body_26217-88r_pic4_by_robert_evans.jpg?direct&300|}} {{:techtalk:ih:oil:xr-750_oil_pump_body_26217-88r_pic5_by_robert_evans.jpg?direct&300|}} {{:techtalk:ih:oil:xr-750_oil_pump_body_26217-88r_pic6_by_robert_evans.jpg?direct&300|}} \\ | |
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| This is a used pump showing the covers and gears. ((pics by Flattracker94 of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/xr-sportster-motorcycle-talk-xr750-xr1000-xr1200/xr-750/187566-xr750-engine-from-rag-to-ripper/page4)) \\ | |
| The left side of this pump has 5/8" dia. fitting for scavenging the sump and the 3/8" dia. for oil supply from the tank. The right side of the pump has ball/spring check valve and 3/8" dia. oil return line to tank. The front side of the pump body has NPT plugs to block off passages from manufacturing/machining oil galleys. Can't make this pump any smaller and no reason to make it bigger, adding weight. Also the pump sits very close to the right side lower frame tube with very little clearance. \\ | The left side of this pump has 5/8" dia. fitting for scavenging the sump and the 3/8" dia. for oil supply from the tank. The right side of the pump has ball/spring check valve and 3/8" dia. oil return line to tank. The front side of the pump body has NPT plugs to block off passages from manufacturing/machining oil galleys. Can't make this pump any smaller and no reason to make it bigger, adding weight. Also the pump sits very close to the right side lower frame tube with very little clearance. \\ |
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| {{:techtalk:ih:oil:1988-up_xr-750_oil_pump_pic2_by_flattracker94.jpg?direct&400|}} {{:techtalk:ih:oil:1988-up_xr-750_oil_pump_pic3_by_flattracker94.jpg?direct&400|}} \\ | {{:techtalk:ih:oil:1988-up_xr-750_oil_pump_pic2_by_flattracker94.jpg?direct&400|}} {{:techtalk:ih:oil:1988-up_xr-750_oil_pump_pic3_by_flattracker94.jpg?direct&400|}} \\ |
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| {{:techtalk:ih:oil:1988-up_xr-750_oil_pump_pic4_by_flattracker94.jpg?direct&400|}} {{:techtalk:ih:oil:1988-up_xr-750_oil_pump_pic5_by_flattracker94.jpg?direct&400|}} \\ | {{:techtalk:ih:oil:1988-up_xr-750_oil_pump_pic4_by_flattracker94.jpg?direct&400|}} {{:techtalk:ih:oil:1988-up_xr-750_oil_pump_pic5_by_flattracker94.jpg?direct&400|}} \\ |
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| | And here is the aluminum pump body (26217-88R): \\ |
| | This is just the body without upper and lower covers. ((photos courtesy of ROBERT EVANS)) \\ |
| | {{:techtalk:ih:oil:xr-750_oil_pump_body_26217-88r_pic1_by_robert_evans.jpg?direct&300|}} {{:techtalk:ih:oil:xr-750_oil_pump_body_26217-88r_pic2_by_robert_evans.jpg?direct&300|}} {{:techtalk:ih:oil:xr-750_oil_pump_body_26217-88r_pic3_by_robert_evans.jpg?direct&300|}} \\ |
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| | {{:techtalk:ih:oil:xr-750_oil_pump_body_26217-88r_pic4_by_robert_evans.jpg?direct&300|}} {{:techtalk:ih:oil:xr-750_oil_pump_body_26217-88r_pic5_by_robert_evans.jpg?direct&300|}} {{:techtalk:ih:oil:xr-750_oil_pump_body_26217-88r_pic6_by_robert_evans.jpg?direct&300|}} \\ |
| ====== Feed Bypass System ====== | ====== Feed Bypass System ====== |
| ===== 1958-1968 KR, KRTT, KHRTT, XLR, XLRTT and 1970 Iron XR-750 Pump ===== | ===== 1958-1968 KR, KRTT, KHRTT, XLR, XLRTT and 1970 Iron XR-750 Pump ===== |
