Honda TRX450R Service Manual page 472

IGNITION SYSTEM (After '05)
IGNITION SYSTEM INSPECTION
NOTE:
• If there is no spark at the plug, check all connec-
tions for loose or poor contact before measuring
the peak voltage.
• Use the recommended digital multimeter or a
commercially available digital multimeter with
an impedance of 10 Mii/DCV minimum.
• The display value differs depending upon the
internal impedance of the multimeter.
Use the peak voltage tester or connect the peak volt-
age adaptor to the digital multimeter.
TOOLS:
IgnitionMate peak voltage
tester
Peak voltage adaptor
with commercially available
digital multimeter (impedance
10 Mii/DCV minimum)
MTP07-0286 (U.S.A.
only) or
07HGJ-0020100
(not available in
U.S.A.)
DIGITAL MULTIMETER
PEAK VOLTAGE ADAPTOR
IGNITION COIL PRIMARY PEAK VOLTAGE
NOTE:
• Check all system connections before inspection.
If the system is disconnected, incorrect peak volt-
age might be measured.
• Check the cylinder compression and check that
the spark plug is installed correctly.
Remove the right front fender (page 3-6).
Disconnect the spark plug cap from the spark plug.
Connect a known good spark plug to the spark plug
cap and ground it to the cylinder head as done in a
spark test.
With the ignition coil primary wire connected, con-
nect the peak voltage tester or adaptor probes to the
ignition coil primary terminal and body ground.
TOOLS:
IgnitionMate peak voltage tester
MTP07-0286
(U.S.A. only) or
Peak voltage adaptor 07HGJ-0020100
(Not available in U.S.A.)
with commercially available digital multimeter
(impedance 10 MS2/DCV minimum)
CONNECTION:
Black/yellow terminal (-) - Body ground (+)
KNOWN GOOD SPARK PLUG
IGNITION COIL
22-6