NGK6 spark plug condition

PostPost by: richardcox_lotus » Sun Apr 22, 2018 1:50 pm

Just thought I?d post this. Been in the car for I think about 4-5 years, probably 7-8k miles, road use only.

Hot day yesterday so I thought I?d check to see how they looked. No 1 at the top is a bit lean (brake servo take-off?) but generally I thought they look ok !
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PostPost by: JonB » Sun Apr 22, 2018 3:54 pm

It'd be easier to tell if they were showing the sparking end a bit better. Especially the insulator.

#1 looks OK to me. #4 is rich and has some oil fouling (probably because the crank case breather pipe feeds the air box at that end). #2 and #3 look slightly rich.
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PostPost by: richardcox_lotus » Sun Apr 22, 2018 4:48 pm

Try this one. #1 on the right
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PostPost by: 69S4 » Sun Apr 22, 2018 5:09 pm

They look like the resister version rather than straight 6's. Are you using copper core leads and non resister caps with them or something else? Just wondering as I was trying to work through poor starting yesterday and one of the suspects was breakdown of my carbon leads but they all checked out the same at 13k ohms. I used copper leads and resister caps for many years but it's not so easy to buy off a roll these days and the carbon leads seem emit less radio noise.

Looking at pic 2 I could live with plugs like that after a few thousand miles. Other than for gross errors you need new plugs to get detailed info. I used to (have to) do it back in the days of riding two stroke motorcycles where one false setting led to a pile of molten aluminium but cars engines are not as fussy. It was all a bit like fortune telling with tea leaves and these days I'd just rather drink the tea. :lol:
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PostPost by: richardcox_lotus » Sun Apr 22, 2018 5:47 pm

Yes they are NGK resister leads. Fitted years ago & still going strong !
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PostPost by: JimE » Sun Apr 22, 2018 6:54 pm

Running a little lean perhaps. Jim
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PostPost by: JonB » Mon Apr 23, 2018 6:32 am

JimE wrote:Running a little lean perhaps. Jim


Now I can see the insulators I agree with Jim.
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