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What is the proper way to check a Spark plug

This is a discussion on What is the proper way to check a Spark plug within the Yamaha YFM660R Raptor (2001-2005) forums, part of the Performance /Technical category; What exactly do I inspect when checking a spark plug? Is it just the parts where the spark jumps between? Thanks...


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Old 02-14-2002, 06:37 PM   #1
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What exactly do I inspect when checking a spark plug? Is it just the parts where the spark jumps between?
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Old 02-14-2002, 07:04 PM   #2
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You mean do a plug check? A spark plug isnt gunna spark anywhere to shouldnt if it sparks its probable good, but engines like new ones everyone once in a while.
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Old 02-14-2002, 07:34 PM   #3
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ok i think you are talking about to see if you are lean or rich because you just jetted your raptor right well get a new plug go out for a ride for like 5 minutes and then find a place you can go wide open for a little bit pull clutch hit the kill switch all at once come to a stop pull your plug take a look that the metal that looks like a J on the top of the plug now look at the heat marks on that if it end buy the threds you are lean if it only gose about 1/4 of the metal your good go back out for about a hour and then take a look at it if it is black your to rich if its white your lean you want a nice brown color

hope this helps
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Old 02-14-2002, 08:18 PM   #4
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Quote:
On 2002-02-14 18:04, badercarma wrote:
You mean do a plug check? A spark plug isnt gunna spark anywhere to shouldnt if it sparks its probable good, but engines like new ones everyone once in a while.
Say what???
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Old 02-14-2002, 11:28 PM   #5
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so I inspect the J shaped arm and the center part in the middle of the plug. But I dont worry about the top of the threaded part?
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Old 02-15-2002, 01:34 AM   #6
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I don't think the upper threaded part would be affected by anything. If I understand that right, that part should be screwed in the head and not affected by anything in the cylinder. But I might be way off.
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