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crimsondragon · July 3rd, 2021, 11:52 AM

https://www.amazon.com/Performance-T.../dp/B00SDGVWQO

This is the set that I use. I haven't tried harbor freight compression testers but they should still be able to thread on. You might have some dirt or carbon on the spark plug threads. I recommend you chase them with a thread chaser prior to buying anything else.

July 3rd, 2021, 11:52 AM	#2
crimsondragon ninjette.org member Name: Tim Location: NJ Join Date: Sep 2013 Motorcycle(s): 2006 Ninja 250 Posts: 47	https://www.amazon.com/Performance-T.../dp/B00SDGVWQO This is the set that I use. I haven't tried harbor freight compression testers but they should still be able to thread on. You might have some dirt or carbon on the spark plug threads. I recommend you chase them with a thread chaser prior to buying anything else.