Classic Cycles Technical Resources
71
TROUBLESHOOTING: ENGINE
Troubleshooting is a broad category. It covers the search for the cause of such complaints as hard starting,
poor acceleration, poor top speed, engine missing, over-heating, short spark plug life, scoring, rough
low-speed operation and a multitude of other symptoms. Regardless of the complaint, the best approach to
solving any difficulty is a systematic approach which is followed regardless of the nature of the complaint.
As a general rule, in following this systematic procedure, you will be able to locate the cause and make a
prompt and inexpensive correction.
Outlined here and on the following pages are recommended procedures to follow in systematically
searching for whatever problem (s) might exist.
I. PRELIMINARY CHECK:
When the cycle does not accelerate or attain rated top speed, check:
TIRES .....Properly inflated?
BRAKES ......... Dragging?
AIR CLEANER ...... Dirty?
MUFFLER ..... Carbonized?
TRANSMISSION . Overfilled?
CHAIN ......Too tight? Dry?
FUEL COCK .. On? Plugged?
FUEL TANK VENT . Plugged?
Deficiencies in any of these areas will seriously affect performance.
II. SPARK PLUG:
Its appearance, if it has been run for any time in the engine, will put it into one of three categories:
It will be normal: Insulator light brown or gray. Slight electrode
wear.
It will be burned: Burned or blistered insulator.
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