16 DR
®
R225, R300 and R390 Engines
Don’t touch the muffler when the engine is running to avoid burns.
3) Spark plug
Spark plug type: See specification section X.
To ensure the engine will run normally, the spark plug gap must be correct and make sure there
are no deposits around the spark plug.
(1) Remove the spark plug cap.
(2) Clear away dirt from around the spark plug base.
(3) Only remove the spark plug with a spark plug wrench.
(4) Visually check the spark plug. Clean with a steel brush. If the insulator is damaged, replace
the spark plug.
(5) Measure the spark plug clearance with a feeler gage. The clearance should be .028" ~.032"
(0.7~0.8mm) If adjustment is necessary, bend the side electrode carefully.
(6) Check if the spark plug gasket is in good conditions. Screw in the spark plug as far as you can
by hand to prevent thread damage.
(7) Tighten the spark plug with a spark plug wrench and compress the gasket.
-- If a new spark plug is used, turn it 1/2 turn after compressing the gasket.
-- If reinstalling the used spark plug, turn it 1/8-1/4 turns after compressing the gasket.
The spark plug must be tightened securely or it may become very hot and damage the engine.
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