1928 and 1929 Harley Hot Rods, JDH 2-Cam Motorcycles

In spite of their amazing power and poularity, the legendary Harley JDH 2-Cam motorcycles were offered for two years in street motorcycles, 1928 and ’29. Yet, so many Harley enthusiasts know little about these amazing machines.

Cut-away illustration of the Harley JDH 2-Cam engine

Here is a short video of a 1924 Harley 2-cam racer in action in a hillclimb in Germany. 1924 Harley 2 cam factory race motorcycle 

Nice 1928 Harley JDH. The 1928 model had a single headlight while the 1929 model had two smaller side-by-side bullet headlights.1928 Harley JDH Solo displaced 74 cubic inches, used a Two-Cam F-head, V-twin with Dow-metal pistons and a three-speed transmission. The JDH retailed for $390. The engine design used direct-action valve gear with cam lobes moving tappets instead of roller arms. They used removable lifter blocks that routes oil back to the crankcase. They also used a throttle-controlled oil pump, came with an air cleaner and no oil-control cover. It was the first model year Harley that came with a front brake as standard. 1928 Harley paint options included: Olive Green with broad Maroon striping edged in Black pinstripes with a Gold center pinstriping. For a higher price you could order it in Black, Fawn Gray, Azure Blue, Maroon, Coach Green, White, Cream or Police Blue1929 Harley JDH with dual headlights and 4 mufflers (2 on each side)

1929 Harley JDH Solo also displaced 74 cubic inches, used a Two-Cam F-head, V-twin with Dow-metal pistons and a three-speed transmission. Bu tthe price dropped for the 1929 JDH from $390 to 370. The engine design used direct-action valve gear with cam lobes moving tappets instead of roller arms. They used removable lifter blocks that routes oil back to the crankcase. They also used a throttle-controlled oil pump, came with an air cleaner and no oil-control cover. It was the only model year Harley offered two headlights and four “Pipes O’ Pan” mufflers on a J series motorcycle. It was the first year Harley offered the electrical-switch panel with ammeter mounted to the center of the bars.  

1929 Harley paint options again included: Olive Green with broad Maroon striping edged in Black pinstripes with a Gold center pinstriping. For a higher price you could order it in Black, Fawn Gray, Azure Blue, Maroon, Coach Green, White, Cream or Police Blue (police order only), and now also Orange. Also available was any two color combination. 

 

 

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