Honda SH125 Manual page 317

IGNITION SYSTEM
ITEM
Spark plug Standard
For extended high speed riding
%ark d u o aaD
SERVICE INFORMATION
GENERAL
Some electrical components may be damaged if terminals or connectors are connected or disconnected while the igni-
tion switch is turned to ON and current is present.
When servicing the ignition system, always follow the steps in the troubleshooting sequence o n page 18-4.
This scooter's Ignition Control Module (ICM) is built into the Engine Control Module (ECM).
The ignition timing cannot be adjusted since the ECM is factory preset.
The ECM may be damaged if dropped. Also, if the connector is disconnected when current is flowing, the excessive
voltage may damage the ECM. Always turn the ignition switch to OFF before servicing.
A faulty ignition system is often related to poor connections. Check those connections before proceeding.
Make sure the battery is adequately charged. Using the starter motor with a weak battery results in a slower engine
cranking speed as well as no spark at the spark plug.
Use a spark plug of the correct heat range. Using a spark plug with an incorrect heat range can damage the engine.
For ignition switch servicing, refer to page 20-12.
For crankshaft position (CKP) sensor removal/installation, refer to page 12-9.
SPECIFICATIONS
CR8EH-9 (NGK), U24FER9 (DENSO)
CR9EH-9 (NGK), U27FER9 (DENSO)
0.8
-
0.9 mm (0.031
-
0.035 in1
SPECIFICATION
Crankshaft position (CKP) sensor peak voltage
0.7 V minimum
Ignition timing ("F" mark) 10" BTDC at idle
TOOL
Peak voltage adaptor
07HGJ-0020100
With commercially available digital
multimeter (impedance 10 MWmin-
imum)
or lmrie diagnostic tester (model
625)