BogMonster Posted April 30, 2006 Share Posted April 30, 2006 I probably should know the answer to this but I don't..... If you run a petrol engine (in this case a 2 stroke but I guess the principle applies on anything) with way to big a gap on the spark plugs, what are the downsides? Does it run hotter/burn plugs out? or doesn't it much matter as long as it runs? Just wondering as I changed the plugs in my outboard yesterday, supposed to be 30 thou and they were 50 to 55! oh and three of the four broke off when I had the feeler gauge in them so probably changed just in time I think, God knows how long since they were last changed The engine ran fine, a bit of a misfire at idle on 1 cylinder (its a V4) but smooth as you could wish for over 2000rpm. No doubt it will run better when it goes back in the water later on though Quote Link to comment Share on other sites More sharing options...
western Posted April 30, 2006 Share Posted April 30, 2006 With a bigger gap to jump I believe the spark would be weaker. this might help http://www.mkiv.com/techarticles/read_plug/plugdiag.jpg Quote Link to comment Share on other sites More sharing options...
BogMonster Posted April 30, 2006 Author Share Posted April 30, 2006 All I am worried about is whether it might have had any negative effects on the engine, none that are apparent - maybe it was why the plugs were so brittle though. I was gonna keep the original plugs to carry as spares but a V1 would not have been much good so they went in the bin That diagram doesn't show my plugs Ralph, those ones all have a funny hooky bit on the end Quote Link to comment Share on other sites More sharing options...
western Posted April 30, 2006 Share Posted April 30, 2006 As the engine is running OK, then it must be fine, your plugs must be the 4 electrode type I guess, I thought the link would help with deciding if the plugs were working OK, would be the same for a 2 stroke motor. Quote Link to comment Share on other sites More sharing options...
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