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Old 23-09-2021, 08:03 PM   #6
Mr Gazza
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Join Date: May 2013
Location: Norwich
Bike: M900sie
Posts: 5,827
NGK every time.
Check if yours have the nipple on the end or just a bare thread. If they have bare threads, make sure to get plugs with detachable nipples and not formed on nipples.
Type 4339 have detachable nipples. Sometimes cheaper in boxes of 4 for cars.

Change @6000 miles for best service.
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