WATERAX MARK-3 Owner's Manual
03/2016 ā Page 30 of 52
Ignition System
Spark plug
Operating with a defective or incorrect spark plug will affect the engine's performance and can cause hard
starting, fouling, missing, overheating, pre ignition and/or lack of power. To service and inspect the spark
plug, the following steps must be performed.
1. Disconnect spark plug cable and remove spark plug.
2. Clean spark plug and inspect carefully. If tip of insulator core is rough, cracked, broken or blistered, or
if electrodes are burned away to the extent that they are too thin and cannot be satisfactorily adjusted
to recommended gap of 0.5-0.6 mm [0.020-0.024 in], replace with new plug.
3. Reinstall spark plug. Start threads one or two turns with fingers to avoid danger of cross threading.
Tighten spark plug to recommended torque of 35-40 Nm [310-354 in-lbs].
4. Connect spark plug cable.
Caution: Ceramic insulation of spark plug is easily damaged by shock stresses or bending stresses as
may be imposed by dropping, striking with hard objects or overtightening. Therefore, if spark plug has
been subjected to such accidental abuse, it should be carefully inspected and tested before further use.
Note: To retrofit engines from point ignition to CDI and DOS, refer
to the Digital Ignition Solution (DIS) conversion kit (600556). User
Instructions and jigs are available.
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