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Old 04-14-2003, 11:14 AM   #1
Chromer
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Member#: 20325
Join Date: Jun 2002
Chapter/Region: NESIC
Vehicle:
08 Yamaha WR250R
07 Suzuki DL650

Default Plug reading question...

What's this mean? Changed my plugs on the weekend. 3 plugs looked good. One plug is sooty on one half, brownish on the other. Ie. If you're looking at the tip of the plug with the electrode at the 12 o'clock position, from 12 to 6 o'clock the insualtor is sooty, from 6 to 12 o'clock the insulator is brownish. (Might be the other way round, plug is long gone in the garbage...) Gap was something like 0.55'ish

My read: Gap was off so badly that cylinder wasn't getting an even burn, was hot on the exhaust side of the cylinder, rich on the intake side.
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Old 04-14-2003, 02:19 PM   #2
BOY
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Location: Ft Wayne, IN
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99 RS-T RIP
02 Forster-S

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Pretty good assessment. The plug was getting partially fouled by the a/f intake mix, igniting late thus causing only 1/2 the plug to register any burn. Sooty, BTW, indicates too rich, brown/copper-ish = good/perfect burn, white/grey = too lean/hot.
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Old 04-14-2003, 05:44 PM   #3
joefocker20
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Hmm.. The tips of my plugs were white when I changed them the other day, but the middle of them were brown.. I wonder if the PROECM is leaning the car out?
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Old 04-15-2003, 08:53 AM   #4
BOY
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the ProECM advances the timing, which will also cause a lean condition if you're not giving it enough/correct octane fuel.
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Old 04-15-2003, 02:07 PM   #5
joefocker20
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Damn, I guess no more 89, even though gas is costing an arm and a nut these days..
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