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IGNITION

SPARK PLUGS

Remove and inspect the spark plugs for the fol-

lowing conditions:

• Worn electrodes

• Cracked insulator

• Dirty spark plugs

Replace all defective spark plugs.

Before installing the spark plug lead cover on the

spark plug, apply a light coating of Electrical

Grease to the ribbed portion of the spark plug

ceramic and to the opening of the spark plug

cover. See table below for recommended spark

plug data and gap setting.

IMPORTANT: Use of non-suppression spark

plugs will cause ignition problems.

FLYWHEEL SERVICING

IMPORTANT: In order to produce the voltage

necessary to run an ignition system, the flywheel

magnets must be of a particular strength. Weak

flywheel magnets can cause low ignition voltage

which would affect engine performance. Weak fly-

wheel magnets can also cause low readings on

ignition test equipment such as the peak-reading

voltmeter, which might cause unnecessary

replacement of ignition components.

An accurate test of alternator output can help

determine flywheel condition. Refer to Running

Alternator Output Test on p. 69.

Removal

Remove the flywheel nut. Use a Flywheel Holding

Tool and three screws, P/N 307641, from Univer-

sal Puller Set, P/N 378103, or Flywheel Holder,

P/N 771311.

Models Recommended

9.9/15 QL82C @ 0.030 in. (0.8 mm)

WARNING

To prevent accidental starting while ser-

vicing, twist and remove all spark plug

leads.

Flywheel Holding Tool 32927

Johnson J15RLSUA User Manual

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