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parts. If the rider neglects to flush out the crank case occasionally, this mixture of fine carbon and oil causes the cylinders, pistons, rings, bearings, crank pin, crank shafts, gears and valve action to wear excessively.

Much so-called "motor trouble" is caused by improper carburetor adjustment. To offset the poor running of the motor, due to heavy oil vapor in the combustion chamber as a result of an over-supply of oil, the rider will adjust the carburetor so that it feeds an excessively rich mixture to the motor. This mixture not only rapidly deposits carbon, but makes a slow burning or poorly combustible gas, tending to overheat the motor and causing a material loss of power. The rider in attempting to remedy this overheated condition will give the motor more oil, making matters worse than ever.

Summed up briefly, proper lubrication means sustained speed and power, and prolonged motor life. It means a uniform gas mixture and the end of most so-called "motor troubles," due to fouled spark plugs, burnt, pitted or warped valves which are often the results of an improperly adjusted carburetor, furnishing too rich a mixture to offset the effects of too much oil.

From the foregoing it is clear that too much oil is almost as serious in its effects as not enough oil. It has usually been taken for granted that as long as a motor received enough oil it made little difference whether an oversupply was used. This is positively wrong. Not only is excessive lubrication expensive from the viewpoint of the cost of the oil itself, but from the standpoint of motor service and life.

The Harley-Davidson mechanical oil pump makes it possible to adjust your oil supply to a nicety; to use just enough oil, not too much, nor too little.

Use of Hand Pump

Occasionally it is advisable to give the motor a little extra oil by means of the hand pump when speeding, negotiating a long steep hill, or when going through long stretches of heavy mud or sand, especially if the machine is carrying a sidecar and an extra passenger.

THE HAND PUMP SHOULD ONLY BE USED WHEN EXTRA LUBRICATION IS NEEDED --- NEVER FOR ORDINARY SERVICE.

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