bar 670 - Spark Plug Maintenance and Adjustment

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3.Maintenance of spark plug

In order to ensure the engine normal running, gap of the spark plug must

be correct and no deposit around the spark plug.

Don’t touch the mufer to avoid burn in the engine running

or just stopping a moment.

1) Remove the spark plug cap.

2) Clear away dirt around the spark plug base.

3) Dismantle 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 instead.

5) Measure the spark plug clearance with a feeler. The clearance should

be 0.7~0.8mm. If adjustment is necessary, bend the side electrode

carefully.

6) To avoid cross-threading, first, screw in spark plug by hand, then

tighten with a spark plug wrench to compress the gasket.

7) If a new spark plug is used, more twist 1/2 turns after compressing the

gasket.

0.7-0.8mm

SPARK PLUG MODEL

NGK: BP5ES/BPR5ES

TORCH: F6TC/F6RTC

MAINTENANCE