2010 YAMAHA YZ125LC check engine

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Page 77 of 166

YAMAHA YZ125LC 2010  Owners Manual 4-17
CYLINDER HEAD, CYLINDER AND PISTON
3. Install:
• Thrust plate "1"
• Screw (thrust plate) "2"
4. Check:
• Power valve smooth movement
Unsmooth movement→Repair or 
replace.
5. Install:
•

Page 101 of 166

YAMAHA YZ125LC 2010  Owners Manual 4-41
CRANKCASE AND CRANKSHAFT
REMOVING THE SEGMENT
1. Remove:
• Bolt (segment) "1"
• Segment "2"
Turn the segment counterclockwise 
until it stops and loosen the bolt.
If the segment gets an impac

Page 103 of 166

YAMAHA YZ125LC 2010  Owners Manual 4-43
CRANKCASE AND CRANKSHAFT
• Apply molybdenum disulfide grease 
to the surface "a" where the crank-
shaft and bearing come in contact.
• Use two plain washers (Yamaha 
genuine: 90201-243K3) "5"

Page 134 of 166

YAMAHA YZ125LC 2010  Owners Manual 5-28
HANDLEBAR
After tightening the bolts, check 
that the throttle grip "2" moves 
smoothly. If it does not, retighten 
the bolts for adjustment.
13. Install:
• Engine stop switch "1"
• Clutch le

Page 151 of 166

YAMAHA YZ125LC 2010  Owners Manual 6-3
IGNITION SYSTEM
IGNITION SYSTEM
INSPECTION STEPS
Use the following steps for checking the possibility of the malfunctioning engine being attributable to ignition system failure 
and for checking t

Page 152 of 166

YAMAHA YZ125LC 2010  Owners Manual 6-4
IGNITION SYSTEM
SPARK GAP TEST
1. Disconnect the spark plug cap 
from spark plug.
2. Connect the dynamic spark tester 
"1" (ignition checker "2") as 
shown.
• Ignition coil "3"
• Spark plug "4

Page 154 of 166

YAMAHA YZ125LC 2010  Owners Manual 7-1
ENGINE
TUNING
ENGINE
CARBURETOR SETTING
• The role of fuel is to cool the engine, 
and in the case of a 2-stroke en-
gine, to lubricate the engine in addi-
tion to power generation. 
Accordingly

Page 157 of 166

YAMAHA YZ125LC 2010  Owners Manual 7-4
ENGINE
ROAD CONDITION AND EXAMPLES OF CARBURETOR SETTING
A. For USA and CDN
B. Except for USA and CDN
SPECIFICATIONS OF JET NEEDLE (For USA and CDN)
SPECIFICATIONS OF JET NEEDLE (For EUROPE, AUS,
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