Crankcase & Bottom End

62 products

Shop the range of aftermarket motorcycle engine products at Pro Class Custom Parts.

$4,024.99

Features & Benefits:- * Heat-treated 4140 material is harder and 114% stronger than stock * Harder material, eliminates thrust washer * Larger 1.671″ diameter crankpin * Designed with increas...

$4,032.99

Features & Benefits:- * Requires the Timken Bearing Sprocket Shaft Crankcase Sleeve & Tool Kit # JM-959. * Requires Timken Bearing Assembly # SS31-4013. * 3 Piece Assemblies. Tech Tips:- *...

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$4,032.99

Note: This S&S 4-1/2″ stroke flywheel assembly when used with 3-7/8″ cylinders creats 106 cubic inch’s 1. Purchase S&S 3-7/8″ piston kit # SS92-1210 & bore your current cylinders Feat...

$4,028.99

Features & Benefits:- * Also Fits Dyna 1999-2005. * Also Fits Touring 1999-2006. * 2003-2006 motors can be upgraded to the stronger Timken Crankcase Bearing. * Heat-treated 4140 material is ha...

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$1,740.99

Features & Benefits:- * Includes Oil Pan. * Allows the installation of S&S engine or crankcase into Dyna 2006-2017. * Oil pickup tube routed to the rear of the oil pan for extended high ac...

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DAYTONA JAPAN

$1,012.99

Features & Benefits:- * Meets or exceeds OEM specifications * Come completely fitted and ready to install * Complete set includes a two-hole crankpin, aluminium retainers, bearings, nuts and f...

DAYTONA JAPAN

$756.99

Features & Benefits:- * Meets or exceeds OEM specifications * Come completely fitted and ready to install * Complete set includes a two-hole crankpin, aluminum retainers, bearings, nuts and fo...

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DAYTONA JAPAN

$768.99

Features & Benefits:- * Meets or exceeds OEM specifications * Come completely fitted and ready to install * Complete set includes a two-hole crankpin, aluminum retainers, bearings, nuts and fo...

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JIMS

$572.99

Kit Includes: * 1 – 24006-80/83, Pinion shaft * 1 – 2196, Metered oil jet screw * 1 – 24016-80, Flywheel side nut * 1 – 2187, (HD # 11218), Flywheel side key * 1 – 2480, (HD # 23985-54), Pinion ge...

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JIMS

$574.99

* Made from 52100 aerospace-quality Timken bearing stock * Sold as a set * Made in the U.S.A Kit includes: * 1 – 24006-73, Pinion shaft * 1 – 24023-36, Flywheel side nut * 1 – 24023-54, Pinion sid...

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JIMS

$539.99

Features & Benefits:- * Machined from solid bronze bar stock. * Hold concentricity to less than .0002″. * Includes Sprocket Shaft # JM-23909-80. * Includes Sprocket Side Nut # JM-24003-55. * F...

$424.99

Features & Benefits:- * Includes standard size crankpin, pinion oil pump key and nut * Replaces OEM # 23961-80 * Made in the U.S.A. Tech Tips:- Fitment Note: Torque crankpin nuts to HD specs 1...

$424.99

Features & Benefits:- * Made in the USA * 1.249″ * Replaces OEM # 23961-41 & 23966-54A Tech Tips:- * Torque crankpin nuts to H-D specs 180-210 ft/lbs for both OEM & S&S forged flyw...

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JIMS

$409.99

* All ground diameters are concentric to within .0003″ to simplify flywheel trueing and rebuilding * Constructed of only domestic steel * Replaces OEM # 24006-58 * Made in the U.S.A.

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JIMS

$347.99

* Sold each * Made in the U.S.A. * Replaces OEM # 24599-93