Author Topic: Not Easy to Choose Spark Plugs for Outboards These Days  (Read 445 times)

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Offline David CVX-16

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Re: Not Easy to Choose Spark Plugs for Outboards These Days
« Reply #20 on: November 09, 2017, 05:46:57 PM »
Look at the condition of the plug when you take it out.  Plugs running too hot and there can be pre ignition or detonation. Plugs running too cold and the engine will miss/foul and the idle will be poor. 
« Last Edit: November 09, 2017, 07:39:38 PM by David CVX-16 »
David
87' CVX-16, 85' 115 HP Johnson, 58.8 MPH GPS w/ 23" SRX Prop
88' 115 HP Mercury (Backup Motor)

Offline V153

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Re: Not Easy to Choose Spark Plugs for Outboards These Days
« Reply #21 on: November 09, 2017, 06:36:47 PM »
Bingo Mike. Surface gaps are used when there's no room left to have an electrode pokin into the combustion chamber. And or no way to index a conventional plug.
'81 Baja 15SS_140 Frankenrude_66.7 mph
'70 something SpeedCraft_(Allison 16R Clone)_Restoration In Progress


WALK TALL AND CARRY A BIG BILGE PUMP

Offline Hot Rod Roy

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Re: Not Easy to Choose Spark Plugs for Outboards These Days
« Reply #22 on: November 15, 2017, 07:46:42 PM »
As for my moniker, in my early days of boating, really not too long ago, I would spend a lot of time checking stuff and getting ready for getting on the water, but in my haste and excitement, I would forget to put the bilge plug in.

Oh!   That kind of "Plug Check"!

 8)
1950 Chris Craft/Mercury
1974 CV-16/Evinrude 115