Read through this whole thread but I am still not clear on whether the new ignition plug cap is the CM-6 size or the one designed to fit the 5/8" BPMR6F plugs. If for the CM-6 it simply will not work on the larger plug and should be replaced with the correct size cap. I assume it is the CM-6 size as the ignition came from a DLE. Also, if from a DLE20 and if it is an older #4 ignition, it would have that horrible advance step that plagued the early DLE20 engines.