Honda B75K2-B75K3 Outboard Motors Manual., Page 24Get this manual
Spark plug and plug capA spark plug having the proper heat range is very important for peak operation of the engineIn order to avoid noise and protect wireless radio communication two noise suppressors are provided in plug caps Removal
Remove the spark plug with plug wrench
Plug cap 0.6-0.7mm (0.024-0.028in Noise suppressor Plug gasket
Inspection
Inspect the spark plug for worn electrodes, excessive gap, foulded condition and damaged porcelain insulation1Clean dirty spark plug with plug cleaner or wire brush2Measure the electrode gap with feeler gauge and if necessary, adjust to the specified gapStandard gap0.6-0.7 mm (0.024-0.028 in 3Replace the spark plug if the porcelain insulator is damaged or distortedStandard spark plugD-5HS (NGK)