Motorcycle illustrated, Volume 5 by Unknown

Author:Unknown
Language: eng
Format: epub
Publisher: Motorcycle Publishing Co., 1910

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MOTORCYCLE ILLUSTRATED

HOW TO LOCATE A MISFIRE

By the Nomad.

ONE of the most annoying things to a motorcyclist is an unaccountable misfire. It generally comes along when one is in a hurry and many parasangs from the old homestead. It develops suddenly, when the engine is purring along peacefully—then—skip!—skip!!—we swear and frown until there is nothing to do but to hoist one's noble form out of the saddle and to tinker by the roadside in the gathering gloom. It generally starts to rain about this time, but that is only another mystery not involved in this chapter of woes. It is sufficient that of all the ills to which the motorcycle is heir, the misfire attack can be beaten only by the "secret puncture," but the latter is another story for future digestion. It is the *'skip-skip-poppety-bang" business which we are up against now, and which claims the earnest attention of our nimble think tanks. Lucky is he who can "limp" for a mile or two to a hostelry, and after a flagon of that which made a certain city famous, tackle the job with a light heart and general contentment withal. I am one who likes to work under peaceful, easy conditions, as the reader may surmise, and if only I can coax the machine to a comfortable homelike spot, aforesaid amber beverage included, I can claim contentment with the world in general. So much for the question of internal lubrication.

When misfiring sets in one usually jumps J* to the conclusion that it is due to some part

of the ignition system, and as this is the Yariout C&QMt of most complicated and delicate part of a mo-Electrical torcycle, the guess is usually accurate and Trouble. ^o the point. Yet the carbureter is often

the real offender, and one can certainly ^ trace the cause to the fuel supply system

if nothing comes to light after a systematic and thorough examination of the electrical apparatus. The various causes of trouble in the sparking system include sooty or cracked spark plugs, loose connections at battery, plug, coil, switch or magnets, short-circuit in -the wiring system, battery run down, dirt on timer, badly adjusted timer, or vibrator of the coil, punctured condenser, pitted contacts or coil vibrators, wear in timer, cracked insulation in timer, moisture or water on timer, wiring, etc. In the magneto system the misfire might be due to faulty spark plug, short circuit in wiring or switch or pitted contacts, etc., as already described in dealing with magneto ignition. Again, water on the magneto will cause serious misfiring or even a complete stallage.

In the fuel system we have the chance of •M water in the carbureter, "bunged-up" strain-

ers, airlock in the gasoline feed pipe, bent The Koet Prevalent float-valve spindle, leaky union or hole in Carbureter the inlet pipe. Stoppage in the inlet pipe

Diftcultlei. (rare), leaky float, bad gasoline and clogged

jet. In dealing collectively with these J* causes of misfiring, I have done my best

to enumerate the general difficulties encountered both in ignition and carburetion.

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