View Full Version : Plugs and jetting
Buddy S
06-22-2014, 04:32 PM
I wanted to get a second opinion on my plugs. Running wot for 10min plug #1 is dry and plug #2 is barely wet. Both plugs are basically the same brown color. If it matters it was 80*F and I generally run anywhere from 15*-100* temps. 1548MV 1995 2stroke 2cyl Johnson 30hp 5400rpm 29mph
Currently .059" high speed jet. Thinking ill need to take it to .061"?
Thank you very much
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zul8tr
06-23-2014, 12:38 AM
What is the brand/plug number? Is it the OEM plug #? The color of the center core looks ok to me, but try the 61 and see what happens. BTW plug reading requires a fresh set of plugs and quick shut off from WOT with no idling. Even short idle time will change the color and give a wet carbon condition.
Buddy S
06-23-2014, 02:45 AM
Champion QL77JC4 (OEM). Ill pick up some new plugs to try with the 61. I did shut down quickly from wot. Thanks
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zul8tr
06-23-2014, 08:11 AM
Champion QL77JC4 (OEM). Ill pick up some new plugs to try with the 61. I did shut down quickly from wot. Thanks
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Well now you will have an extra set of plugs.
What type and size engine are we talking about?
Post pics of the plugs when you pull them after test.
Do you really need the resister type (Q prefix for CDI systems) rather than just the L77JC4 plugs? Is plug electric feed back an issue?
Buddy S
06-23-2014, 08:15 AM
I honestly dont know if I need the Q plugs. 1995 Johnson 30hp 31.8ci 2cyl
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zul8tr
06-23-2014, 11:29 AM
I honestly dont know if I need the Q plugs. 1995 Johnson 30hp 31.8ci 2cyl
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All I can figure it must be a design requirement for the CDI system to prevent damage. So keep using them.
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