The HD model J was introduced in 1915 with the 61 CID flathead V-twin. By 1921 there were two model J’s and two JD’s (Solo and Sidecar). The JD used a 74 CID motor and there were three variants of that motor offered: A=High Speed Police, B=High Compression for high altitude use, and E=Special Racing Motor. The J and J Sidecar sold for $485, the JD and JD Sidecar sold for $520. Sales for 1921 were 4526 J models and 2321 JD models.
The 1921 Harley Davidson Model J used a 1000CC (61 CID) air cooled flathead V-twin motor that produced 8.68 HP pushed through a 3 speed hand shifted transmission for a top speed of 60 MPH. Total weight was 325 LBS and suspension was leading link on the front and a rigid rear.
This particular 1921 Model J (VIN # 21J 1966) is in Saint Louis, Missouri and is listed as clear titled, well running good rider. It is said to have been painted in the 1980s. The price is currently at $14,100 with the reserve not met