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PERFORMANCE MOTORCYCLE PARTS AND KITS FOR AMERICAN V-TWINS

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Pinion Gears for 1939–'53 Big Twins

 
 
 
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$125.95
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Description
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Specs
Fitment
Instructions

High quality S&S pinion gears are carefully machined, heat treated and then finish ground. Three distinct year groups in up to eight different color coded sizes for optimum gear lash are available for big twin engines. S&S color codes match Harley-Davidson® color codes so that replacement is easy. Just pick the appropriate color S&S gear that matches the color on the damaged stock gear. Fits 1977–'89 big twins and 1990–'99 engines with S&S® flywheel assembly.

 

S&S® 1939–'53 Big Twin Style Pinion Gear Selection Chart  
  Biggest 
Average Smallest
Color Code   Orange   Black 
Red Blue 
Green
White Brown Yellow
H-D®
Part No.
 
— 
4010-51 

24010-39 
24010-39
 
 —
S&S
Part No
.  
33-4101
33-4102
 
33-4104 
33-4105 

 



Notes: If the stock gear is unmarked and the size is unknown or you are scratch building an engine and have no gear, we recommend that you order a gear in the middle of the size range. These sizes were used more often and should provide adequate gear clearance under most circumstances. When in doubt, use a gear from the middle to the small side of the range, because a combination of looser fitting smaller gears is less likely to cause binding and premature wear. Consult the chart for the size and appropriate part number required. If you wish to achieve optimum cam gear to pinion gear fit, consult your factory service manual for instructions on fitting these gears before making a selection. Some sizes, particularly those on and near the ends of each range, are available on a limited basis because they are the extremes.

S&S® does not offer a replacement pinion shaft for 1990–'99 big twin engines that accepts a stock pinion gear, oil pump drive gear, gear spacer and pinion gear nut, because experience has shown that the design is not strong enough for performance applications. For this reason, we recommend and sell only the pre-1990 style pinion shaft for big twins. To make the change easier, S&S offers a conversion package consisting of a pinion gear, spacer, nut and oil pump drive gear for big twin engines.


All reference to H-D® part numbers is for identification purposes only. We in no way are implying that any of S&S® Cycle’s products are original equipment parts or that they are equivalent to the corresponding H-D part number shown.

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