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Old 06-23-2019, 11:27 PM
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bruceh bruceh is offline
 
Join Date: Mar 2008
Location: Ramona, CA
Posts: 2,334
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As others have said, I remove the plugs from the adapters and then clean the threads on the adapters. I bought a handy tool from Avery back in the day that looks like a tap, but it is used just to clean out the threads on 18mm and 14mm sparkplug holes. I use nickel anti-seize, but have used the copper anti-seize in the past. Just a little bit and then I use a small brush to get a light coat on there. Keep the anti-seize off the end of the spark plug. Put in new plugs, since a set of 8 NGK BR8ES plugs only costs $20. Gap them as directed and screw them in hand tight in the adapters. Put new Copper washers on the adapters and then get them back in the cylinder for torqueing via the plug (not the adapter).
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