SANYANG INDUSTRY CO. XS125-K Service Manual page 8

B. ROTATION ROUGH (LACKS POWER)
symptom
engine speed up
ignition timing
correct
valve clearance
correct
compression normal
no clogged
no fouled
discolored
oil lever normal
normal
no overheating
no knock shock
inspection adjustment
start engine and slightly
apply fuel
engine speed can't up
adjust ignition timing use
timing tester
ignition timing
incorrect
valve adjuster poor
valve coearance
incorrect
compression pressure check
pressure to low
carburetor block check
block
remove spark plug
dirt and color change
check crankcase oil level
for too much or dirt
oil too much
check cylinder head
lubrication
abnormal
engine too hot
overheated
high speed
continue working
knocks
1.GENERAL INFORMATION
cause
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
valve clearance misadjustment
valve seat worn
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
too much oil
too little oil
oil no replacement
oil tube clogged
lean projection from oil pump
piston, cylinder worn
lean mixture
poor gasoline
carbon in burning chamber too much
ignition timing too early (C.D.I. faulty)
clutch slip
carbon in burning chamber too much
poor gasoline
clutch slip
lean mixture
ignition timing too early(C.D.I.faulty)
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