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3.2.2 Spark plugs maintenance
Check the colour of the spark plugs: see user manual.
Use a feeler gauge to measure the distance between the spark plugs electrodes.
Worn spark plug limit
(mm)
0,9
If the distance between the electrodes is equal to or greater than the indicated limit or if
scheduled maintenance is required, replace the spark plugs.
The new spark plugs for the engine must be of the same type and rating as the ones to be
replaced (NGK BR9ES).
Check the connectors: if they are damaged or the connection to the spark plugs is not stable,
replace them.
Check the ignition cables: there must be no cuts or cracks, otherwise replace the ignition coils
(including ignition cables).
Cosmos 300 – Maintenance manual – V2
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