bmwz4 wrote:
Have been reading about spark plugs, fully understand about the heat range but Trevor also recommends plugs with a short earth strap ie NGK plugs with a suffix ECS, when googling this these seem rarer than hens teeth and seem to relate to snowmobiles? Ive also seen pictures of people who have cut down the strap themselves thus achieving the same thing.
What are people actually using?
Thanks
That can be a tough question to answer because of there are so many engine designs out there. BUT in a nutshell, one grade harder plug (I've always stuck with NGK) should do you right. You shouldn't have to worry about the strap lengths much if you can't locate the shorter strap. Cutting the earth strap achieves a similar effect: the goal is to minimize the amount of metal protruding into the cylinder. This will allow the strap to dissipate heat and avoid preignition and detonation from occurring.
I doubt you'd have problems at all with glowing plugs at 75 hp with your engine size, but it doesn't hurt to cut the strap if you can.
What are the stock plugs for your engine?
