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sportster_history:1957_sportster [2017/03/13 01:52]
hippysmack [Engine] 		sportster_history:1957_sportster [2017/12/17 20:32]
ixl2relax ↷ Links adapted because of a move operation
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 [[http://​www.harleykmodel.com/​literature/​spare-parts-catalogs/​documents/​99451-57/​99451-57.pdf|1957 Parts Manual]](( http:&#​47;&#​47;​www&#​46;​harleykmodel&#​46;​com&#​47;​literature&#​47;​spare-parts-catalogs&#​47;​documents&#​47;​99451-57&#​47;​99451-57&#​46;​pdf)) [[http://​www.harleykmodel.com/​literature/​spare-parts-catalogs/​documents/​99451-57/​99451-57.pdf|1957 Parts Manual]](( http:&#​47;&#​47;​www&#​46;​harleykmodel&#​46;​com&#​47;​literature&#​47;​spare-parts-catalogs&#​47;​documents&#​47;​99451-57&#​47;​99451-57&#​46;​pdf))
  
-Back to [[:sportster_history:​start|Sportster History Index]] +Back to [[sportster_history:​99xx-01|Sportster History Index]]
-The Sportster XL was introduced as “a modern, up-to-date power plant” and weighing in at  2) +
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- 55cid 7.5:1 Compression,​ hemi-spherical style heads, 90 degree valve angle, OHV V-twin, 4 cams 4)5) +
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- 48 ft-lbs of torque at 3600 RPMs. +
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- ​1-11/​16“ Dia. intake valves 6)  +
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- ​3”x3.8“ bore and stroke  +
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- ​Piston Displacement (883cc) 53.9 cu. in.  +
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- ​Kickstart only +
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- 18” wheels standard +
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- ​Speedometer designed into the sheet metal of the fork shroud. +
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- ​Telescoping front forks +
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- Fuel tank capacity 4.4 gallons. +
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- Oil tank (3 quarts) located under the seat on the right side using a recirculating oiling system +
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- Two brush generator w two-unit voltage regulator powering a six volt system +
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- ​Coil-over shocks +
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- '​Jubilee'​ trumpet horn mounted on the right side of the engine, power pack on the left side +
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- Paint color, 'HD 100' enamel +
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- ​Standard solo seat +
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- ​Options included +
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- ​Windshield +
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- ​Saddlebags +
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- Dual seat +
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- Front drum brakes (operated by a lever on the left handlebar) +
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- Rear drum brakes (operated by a foot pedal on the left side) +
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- Rear swingarm with Timken bearings at pivots. +
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- ​Short-barrel Linkert Carburetor  +
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- ​Engine ID numbers on a pad located on the left side between the cylinders +
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- ​Straight retained bearings on gear shaft +
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- ​Roller valve lifters were called (High Speed Racing Tappets) +
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- Spark plugs were air cooled and could be dis-assembled +
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- Cams ramped on both closing and opening side +
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- ​Stellite-faced exhaust valves +
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- ​Aluminum alloy pushrods extend up through the covers to reach the rocker +
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- ​Cam-ground aluminum pistons w/ chrome plated top ring, non plated center ring and u-flex lower oil ring +
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- ​Aluminum rocker boxes enclose valves and rockers +
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- Cast iron barrels and heads  +
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- ​Single-unit construction of engine and transmission +
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- Four speed transmission with a foot shifter on the right side +
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- Seven plate clutch (operated by a lever on the left handlebar) +
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- ​Primary chain and transmission are lubed by an oil bath separate from engine oil. +
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- ​Double tapered Timken roller bearings on sprocket shaft +
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- Only Year: +
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- ​Woodruff keys for camshaft gears +
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- 6 splines on drive gear/ second gear shaft +
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- Choke control operated by a left side lever +
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- Tank emblem: Round plastic disc with 2 silver and red quadrants with Red Harley-Davidson name over it, press riveted to the tank. +
  

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