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View Full Version : 400 ex spark plug hole size



greg_gorrell
06-18-2005, 10:34 PM
hey sorry for being lazy and all but i want to order a compression tester for my arsenal of tools but im unsure of the size hole for the 400ex spark plug. its too late to run out to the garage and check since i have an apartment above it and the guy is sleeping and i would like to place the order asap. thanks

MadMax27
06-19-2005, 12:42 PM
My buddy uses his automotive set, with the tapered rubber cone to insert into the plug hole. Works for him....:cool: