Flathead - flathead serial number - my serial number is 49S****. It appears to be a wr motor. Does that seem right?

Lloyd banks rookie of the year mixtape download. Hello - I'm a new member from the UK with a long term Shovel and a newly aquired WLA. The WLA has the serial number M 61810 on the side of the crankcase near the timing inspection plug. It also has 45 4400 on the belly of the crankcase. Can anyone shed any light on these numbers as the first one seems to be incorrect. Also the forks have been extended, and I am going to shorten them back down to standard.

Can anyone give me a measurement, say from the centre of the pivot at the bottom of the fork to the lip where the bottom yoke 'wraps around' the outside of the fork? (or any other 2 points for that matter) Many thanks. The 45 4400 is not a serial number it is the crankcase production number.  Both case halves should have the same number showing that they were machined and mated together.  The cases were made in 1945 but with WLA's the serial number could have started with 42WLAXXXX since they made 42 WLA's into 1945.  The serial number you have may have been a builders #.  Check to see if the number boss has been ground down or overstamped.  It may have been put on a set of blank replacement cases that were available for years.

Davidson and his wife Nancy have been to the Wheels Through Time museum 3 times and this 1936/1937 Exhibit is their favorite place here. In this space, Style and Function are intertwined with a design template that would carry the motor company into the next century. Not only was the chassis redesigned with streamline fuel tanks and an integrated dashboard, but the new heavyweight V-Twin also offered a standard 4 speed constant mesh transmission. The big news was the new 61 cubic inch over head valve engine that utilized a newly developed dry sump oil system. This was the first Harley that recirculated the engine oil to and from the oil tank. It was given the model designation EL.

It has been affectionately called the Knucklehead since its inception in 1936. In 1937 Harley’s outdated side valve engine was redesigned incorporating a recirculating oil system. Redesigned crankcases allowed the side valve to fit the same chassis as the OHV machine streamlining cost and production time. Now, Harley had the market covered with the newest designs. The man who led the design of both the Knucklehead and the improved Side Valve engine was chief engineer William S Harley. William was one of the 4 founding fathers of the Company. He had spearheaded the development of their machines along with Willian Ottaway who joined the motor company in 1913.

William Harley did see the success of his new design before he passed in 1937. In 1936 approximately 2300 OHV machines were produced.

Quite a remarkable number considering each machine went down a primitive assembly line and were certainly “hand built”. Although the early production machines experienced various oiling problems, its potential was immediately realized on street and track.

Joe Petrali who was Harley’s lead tuner/ racer/tester and promotional rider set a record of over 136 miles per hour on the sand in Daytona on a modified streamlined built in the Harley racing department. The new OHV was also successful in both enduro races and hillclimbing. The success on the track proved successful in the sales department which gave the Indian company great concern.

The Knucklehead design remained reliable and successful until it was replaced 11 years later with the new alloy head V-Twin called the Panhead in 1948. It is difficult to determine how many of these machines survived, however 6 examples of the 1936 OHV, 2 examples of the 1937 Side Valves and 3 1936 Prototype Side Valves grace this exhibit. Each machine has a great story that could make a best selling book!