I bought this spark plug for my Poulan P4018 chainsaw (2-stroke engine, 40cc) on the spark plug itself, which you unscrew like any standard spark plug. The spark plug fits snugly on both threads and, open electric, the cap retracts fully with no problems (well, no more than a stock spark plug. You'll have to fiddle with the cap around the grip and brake. The spark plug isn't to blame) My chainsaw is still never started that easily even when brand new with Champion OEM spark plug Thanks to NGK for the great quality and affordable spark plug boot.
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