My Cushman Is Referred To As A Binder Engine

| November/December 1994

The clutch pulley belted


3801 Purdue Drive, Bakersfield, California 93306

Gentlemen, I would like to tell you about my 4 HP Cushman (light weight) also referred to as a binder engine. This engine was kept light by using only one flywheel, and on the opposite side is a clutch pulley for a 4' flat belt.

This engine was designed to be run with a model T coil and had a point set-up on the cam shaft. This set-up was a complete disaster for me, so I used a Fairbanks Morse model FM J impulse type magneto driven by a chain sprocket on the cam shaft. This worked okay, except you cannot get a fine timing adjustment with chain links. So, I bored out the chain sprocket and fit it over a hub on the cam shaft and used set screws for fine tuning. Some later models have a Dixie magneto driven with right angle gears with special brackets holding the magneto. (As shown in picture from the instruction manual.)

The original cooling tanks were round and fit into a round part in the frame that was referred to as the banjo frame. Because my engine is already doctored up, it was easier for me to make the tank as you see it. The Schebler carburetor, which was all brass, was an education by itself. It is hard to adjust because it is a large carburetor used on a small engine. I designed a Ventura tube for it and solved all my problems. There is an exhaust pre-heating system design on the intake manifold that makes the engine very efficient on fuel.

This engine has a very unusual lubrication system. Because of the closed crankcase, it has a dip type splash to the crank thro and also two tubes that pick up oil to the main bearings. This caused the bearings to leak oil, so I removed the tubes and put in grease cups to pack the bearings. Now the engine runs clean.

There is a drip oiler on the side of the cylinder, which is rather unusual for a closed crankcase engine, but the instruction book says this drip oiler, besides oiling the piston, helps to keep the oil level up while running. Another good feature on this engine is a built-in gear driven water circulating pump. It is well designed and well built.