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Old 27 March 2009, 07:58   #1
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Mercury 60HP Outboard, Which sparkplugs?

Hi All

I have a 1989 60hp Mercury outboard fitted to my boat, recently fitted a fixed VHF and antenna, i am getting really bad interference from the outboard when its running, speaking to a bloke the other night he thinks i can get replacement spark plugs that will sort the problem?

Any ideas ehat plugs will do the job?

regards
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Old 27 March 2009, 08:33   #2
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The NGK plug will be the same number, but with a Z in it.
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Old 27 March 2009, 09:07   #3
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Thats right, but not the full picture.
R designates a restive supressor and Z an inductive resistor. You Need the Z in the right place though, If the Z is the first letter then its an extended gap plug, and if its the last letter it designates a 2.9mm electrode.
you need it in the middle! as in BP6ES,BPR6ES, and BPZ6ES being no supressor, resistive and inductive respectively.
If you get the Z in the wrong place the plug could potentially cause engine damage.
here the NGK chart so you can double check.


http://www.spark-plugs.co.uk/pages/technical/ngkjpg.htm
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Old 27 March 2009, 10:40   #4
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very true.

If you have the serial # of the motor, I can tell you which plug you need.

eg, if you currently use BU8H, then you'd need BUZ8H
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Old 27 March 2009, 11:25   #5
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the serial number is 954927, not sure what plugs i currently have in, will pop down this weekend and have a look.

Many thanks for all you help
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Old 27 March 2009, 12:34   #6
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You need NGK BUZHW
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