Page 193 - Mercury Service Tool Guide (2020) - 8M0163249

TWO STROKE ELECTRICAL TOOLS SPARK GAP TESTER

TWO STROKE ELECTRICAL TOOLS
IGNITION TIMING TOOL

91-818812A 1
91-850439T 1
Locks the electronic spark trigger ignition system in base timing mode to set the Provides a visual indication of spark/coil efficiency.
initial ignition timing. Also used as a jumper lead for testing various circuits.
Outboard and MerCrusier SPARK PLUG EXTENSION TEST HARNESS
FLYWHEEL HOLDER

91-877870A 1
Connects between the park plug leads and Spark Gap Tester to provide additional
91- 83163M length to the spark plug leads when testing ignition spark.
Holds and/or turns the flywheel while making engine repairs. Used to torque the Use with 850439T1 Spark Gap Tester.
flywheel or the engine coupler.
TIMING DECAL
FLYWHEEL PULLER

91-853883 1
Aids in troubleshooting ignition timing on three cylinder engines by determining the
timing of individual cylinders.
TIMING DECAL

91-849154T 1
Removes the flywheel from the crankshaft.
PROTECTOR CAP

91-853883 3
Aids in troubleshooting ignition timing on six cylinder engines by determining the
timing of individual cylinders.

91- 24161
Protects the crankshaft when removing the flywheel. Use with flywheel puller (P/N
849154T1).

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