Harley introduced the side valve concept for the V-twins for the 1929 model year when the 45 ci model D was introduced.A year later the F head big twin was replaced by the side valve 74 ci model V.The model D was sometimes referred to as the “three cylinder Harley”, because of the remarkable vertical position of the dynamo.
The Model D was all new for 1929, using battery and coil ignition rather than a magneto, and had removable Ricardo heads. Small headlights were the trend beginning in 1928 and Harley went one better with small twin “bullet” headlights for their models in 1929 and 1930. classic-motorcycle.com
The primary chain was kept moist with an air/oil mix from the crankcase breather system. The bike held onto its past with a final year running clincher wheel rims. In a nod to noise nuisance, the bikes featured quiet four tube “Pipes O’ Pan” mufflers.
The 3-speed hand shift transmission was secured to the frame, a first for the company, and the clutch ran dry under a sheet metal chain guard. In 1929, the price of a Harley Davidson DL was 290$.This sturdy 750cc V-twin of the D-Series is in presentable condition. It is equipped with a younger Amal carburetor so that it is more roadworthy.via/read more: classic-motorcycle.com
- Manufacturer: Harley Davidson
- Model: DL
- Year: 1931
- Displacement: 746 cc
- Cylinder: 2 / V-twin
- Engine type: 4-stroke / sv
- Bore / Stroke: 70 x 97 mm
- Power: 18.5hp @ 4000 rpm
- Compression Ratio: 1 : 5.0
- Weight: 177 kg
- Top Speed: 113 km/h
- Production years: 1929 – 1931