1.GENERAL INFORMATION
1-5
B. ROTATION ROUGH (LACKS POWER)
symptom
inspection adjustment
cause
start engine and slightly
apply fuel
engine speed up
engine speed can't up
adjust ignition timing use
timing tester
valve adjuster poor
ignition timing
correct
ignition timing
incorrect
valve clearance
correct
valve coearance
incorrect
compression pressure check
compression normal
pressure to low
carburetor block check
remove spark plug
no clogged
block
air cleaner clogged
fuel tube clogged
air hole on the fuel tank cap blocked
exhaust tube clogged
auto air cut faulty
carburetor vacuum diaphragm worn
auto fuel cup faulty
faulty CDI unit
faulty A.C.Generator
fualty valve seat
cylinder, piston worn
gasket leak
valve timing incorrect
piston ring worn
remove and clean
remove dirt
spark plug improper heat range
spark plug clearance misadjustment
no fouled
discolored
dirt and color change
valve clearance misadjustment
valve seat worn
check crankcase oil level
for too much or dirt
oil lever normal
oil too much
too much oil
too little oil
oil no replacement
check cylinder head
lubrication
normal
abnormal
oil tube clogged
lean projection from oil pump
engine too hot
no overheating
overheated
piston, cylinder worn
lean mixture
poor gasoline
carbon in burning chamber too much
ignition timing too early (C.D.I. faulty)
clutch slip
high speed
continue working
no knock shock
knocks
carbon in burning chamber too much
poor gasoline
clutch slip
lean mixture
ignition timing too early(C.D.I.faulty)
