jd cases 1928-1929

[ragsflh]

looking for a set of 1928/29 jd cases to build a extra motor.cylinders too

[aumick10]

I have 28JL and 29JC cases if they are any use to you.
Cheers,
Mick

[ragsflh]

you mean 28 jd cases

[JoJo357]

https://www.techsweb.us/hdvin2029.html
https://www.google.com/url?sa=t&rct=...2125ZXnlaZrULB

"For sporting riders not willing to go the Two Cam route, there were the new Special Sport Solo models, the 61 ci JL and 74 ci JDL. The L motors were high-performance versions of the standard (one-cam) motors that featured larger inlet valves and valve cages. Like the Two Cam Models, the Special Sport Solo models had narrower tanks that gave an impression of nimbleness and 18 in. wheels that lowered the saddle height about 1 in. Shorter roadster handlebars were standard on both the Two Cams and the Special Sport Solos."

The J models dominated Harley’s offerings in 1928. It icluded the following: J Solo, JS Sidecar, JX Sport Solo, JXL Special Sport Solo, JH (61 cubic inch 2 cam), JD Solo, JDS Sidecar, JDX Sport Solo, JDXL Special Sport Solo, JDH Solo (74 cubic inch 2-cam). Costs were $310 for the J, JS, & JX models, $320 for the JD, JDS, and JDX models, $325 for the JXL, $335 for the JDXL, $360 for the JH and $390 for the JDH. 4,184 Harley J models sold and an impressive 11,007 JD motorcycles too. This was the year Harley introduced the front brake and the hot rod 2-cam JH and JDH models.

1929 was the last year for Harley to sell the J series motorcycles. In 1929 Harley offered the following J series models: J Solo, JH 2-cam Solo, JS Sidecar, JD Solo, JDS Sidecar, JDH 2-cam Solo. Harley also offered the JXL, JDXL and JDF motorcycles. The J series sold for $310, The JD models for $320 and the JDH sold for $370. All told they sold 13,068 J and JD series motorcycles in 1929. It was the only year the J series were factory equpped with the dual bullet headlights, the electric switch panel and ammeter on the handlebars, and the 4 tube “Pan o’ Pipes” exhaust muffler set up.

*M.A.D.*

[aumick10]

It is my understanding that the engine # can provide additional information.
The first series of numbers/letters determine the model of the bike as JoJo has written.
Additional letters can identify the engine configuration.
For instance,
a 25 JLCB is a 1925 61",J sport solo, commercial motor (C), with iron alloy pistons (B)
a 24 JDCA is a 1924 74", Standard bike, commercial motor (C), with alloy pistons (A).
Can somebody correct me if my understanding is incorrect.
Cheers
Mick

[MMasa]

Mick
Are you sure that the 25 isn't a JDCB? I've never seen a JLCB.
In this case, the C does not indicate Commercial.
In 1923 and 1924 there were JD/FD models as well as DCA models (both JDCA and FDCA)
Basically the only difference between the D and DCA models was the cylinders, valves, intake housings, clamping nuts, Pistons and flywheels. The A does refer to the aluminum alloy pistons. The flywheels are unique only because of the balance factor from the pistons.

The DCA models used what are generally considered to be the larger 74" intake housings and valves.
For 1923 and 1924, the standard 74" JD/FD still used the smaller 61" intake housings and valves, intake and exhaust.
In 1925 the JD/FD was dropped and only the DCB was offered. Gone were the 61" intake housings on 74" motors. The B referred to the lighter iron alloy pistons.
1926 up dropped the CA/CB designation since all 74" engines used the new, larger parts and we were back to JD FD etc.
Does that help ?
Mark

[aumick10]

20190206_150939.jpg20190206_150939.jpg
Not clear photo or stamping
On closer inspection You may be correct mark.
It could be 25 JDCB.

[MMasa]

It could also be a JLCB as that is definitely NOT a factory VIN stamping.
Mark