The 1936 model was a great success. In the effort to constantly improve, Simplex made several significant changes to the '37 model. The brakes were upgraded to drum brakes front and rear as standard equipment, and a heavier drive belt was used.

A twist grip throttle was used on the right handlebar in place of the lever-type, and a separate compression release lever was used, also located on the right handlebar, with the front brake lever located on the left handlebar. The Torrington handlebars (identified by a "T" inside a circle near the left end) and a Messinger B1 DeLuxe bicycle saddle were standard equipment.

The '37 model used a headlight operated by "special points" in the magneto, and a tail light which used flashlight batteries. The front forks utilized four springs to assist in controlling dive due to the now-standard front brake.

The cylinder is a square shaped cast iron piece incorporating one spark plug which is fired by an Eisemann 71-LE magneto. The carburetor is a Tillotson MS model, and the air cleaner attaches to the frame by a bolt on the left tubular vertical frame rail.

1937 Engine with Square Cast Iron Cylinder

The engine serial number begins with the four digit year designation "1937" followed by the production sequence number. Tires are again the 26"x2.125" balloon bicycle tires.

An interesting warning appears in the 1937 Instruction Manual which reads: "Do not cross street car tracks at less than 45 degrees as the tires might fall in and follow the tracks." It should be noted that the Simplex offices and plant were directly across from a street car line in New Orleans at this time, so perhaps this lesson was learned the hard way!

Original selling price was $137.50. At the time, Simplex advised in the Instruction manual that if your cylinder bore wore out, you could return the cylinder in exchange for a factory replacement for $1.50, or you could purchase a complete new engine less magneto and carburetor for $15.00.