John Jones Evangelism

I can’t remember how many times JJ has mentioned spark testers. I bought a couple and this is how I made them work for the SD



As you can see these are designed for leaving the screw of part on the spark plug so

First thing drill a shallow 2.5mm hole in the top of the tester - file the surface flat first



tap to 3mm, can’t get much thread, then file a 3mm screw cone shared about 2mm and screw it in the threaded hole until tight



I then soldered the joint to give it more strength - 25 watt iron



cut off the screw head and made a cap from a piece of brass subs drilling and threading it to 3mm



screwed it on and soldered the top



to use you need to screw a cap onto the plug on the bike



connect the tester



and bobs your uncle