Spark plugs - KLE400 vs KLE500
Since the first time I serviced my KLE400 myself I've always replaced the spark plugs with whatever the dealer gave me (ask for plugs for a KLE500). I have not had any issues and and it's even been on the dyno after I had a Stealth aftermarket pipe installed and the carb re-jetted (made 40hp atw  ). Now the question, I see you guys recommended not using the KLE500 plugs in a KLE400. Why?
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