Re: How often To Change Plugs
The manual states:
Every 100 Hours of Use or Once
yearly, Whichever occurs first
1. Lubricate all lubrication points. Lubricate more
frequently when used in salt water.
2. Inspect and clean spark plugs.
3. Check engine fuel filter for contaminants.
4. Adjust carburetor(s) (if required).
5. Check engine timing setup.
6. Check corrosion control anodes. Check more frequently
when used in salt water.
7. Drain and replace gear case lubricant.
8. Lubricate splines on the drive shaft.
9. Check and adjust valve clearance, if necessary.
10. Check power trim fluid.
11. Inspect battery.
12. Check control cable adjustments.
13. Remove engine deposits with Quicksilver Power
Tune Engine Cleaner.
14. Check tightness of bolts, nuts, and other fasteners.
Spark Plug Inspection
Inspect spark plugs at the recommended intervals.
1. Remove the spark plug leads by twisting the rubber
boots slightly and pull off.
2. Remove the spark plugs to inspect and clean.
Replace spark plug if electrode is worn or the insulator
is rough, cracked, broken, blistered or
fouled.
3. Set the spark plug gap, where applicable. See
Specification Chart.
4. Before reinstalling spark plugs, clean away dirt
on the spark plug seats. Install plugs finger tight,
and tighten 1/4 turn or torque to 20 lb. ft. (27 N?m).
I don't believe I have ever seen a mandatory replacement period for plugs.
Gerry
