Classic Cycles Technical Resources
75
D. Incorrect Spark Plug in Use. A spark plug not recommended for use under the particular operating
conditions can result in overheating. Select the correct plug recommended for this particular model you
may be working on.
E. Spark Plug Incorrectly Gapped. An incorrectly gapped plug can effect ignition timing. The problem is
most frequently found when an American-made plug is installed. The standard equipment NGK plugs
are factory gapped within the correct .025"-.028" range. American plugs will almost always be factory set
at a wider gap. Gap should be set before installation.
F. Faulty Points and Condenser. Check point surfaces for wear. Check condensers against specifications as
set forth under Electrical Equipment: Technical Standards, page 59.
G. Dirt in Carburetor. This condition, obstructs fuel flow and results in running too lean a mixture, which
causes overheating.
H. Transmission Oil Too Heavy. Excessively heavy oil in the transmission case causes the engine to
overwork due to extra drag. The transmission should be filled with the correct amount of S.A.E. 10W-30
motor oil.
I. Tires, Brakes, Chain. These items must be periodically checked to avoid placing an abnormal load on the
engine due to drag.
TROUBLESHOOTING: TRANSMISSION
I. MISSED GEARS:
(1) Check shifter arm pawl. Are the pawl teeth broken ? Check
the return spring.
(2) Check the shift drum stopper. Is the spring stretched ?
(3 ) Inspect the gears (especially low gear “B” ). Any burred or
broken teeth ? Any broken
drive dogs ?
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