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Old 06 July 2014, 17:51   #1
Al.
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Plug help, Johnson 115hp

Can anyone help with advice on spark plugs for a johnson 115hp

Details
Johnson v4 115hp
2 stroke.
Year 2006.

In it now are NGK BPR7HS-10 but I also found a site saying BPZ8HS-10

Thanks.
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Old 07 July 2014, 14:20   #2
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Have a play here: NGK Partfinder for Marine Spark / Glow Plugs
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Old 07 July 2014, 14:33   #3
Al.
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Hi Paintman.

I have been there, and it says bpz8hs-10

I will have to find out what the difference is between the two plugs.
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Old 07 July 2014, 15:23   #4
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NGK technical guide to plug part numbers here: http://www.ngksparkplugs.com/techinf...tnumberkey.pdf

Looks like the main difference is that the 8 is colder than the 7.
When the heat rating is too high:
The spark plug temperature remains too low and causes deposits to build up on the firing end; the deposits offer an electrical leakage path that gives rise to loss of sparks.

When the heat rating is too low:
The spark plug temperature rises too high and induces abnormal combustion (pre-ignition): this leads to melting of the spark plug electrodes as well as piston seizure and erosion.

ETA more here: http://www.ngk.de/en/technology-in-d...-the-ngk-code/
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Old 09 July 2014, 03:57   #5
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Quote:
Originally Posted by Al. View Post
Can anyone help with advice on spark plugs for a johnson 115hp

Details
Johnson v4 115hp
2 stroke.
Year 2006.

In it now are NGK BPR7HS-10 but I also found a site saying BPZ8HS-10

Thanks.
Hi All

Why not phone a johnson service centre they would be able to tell you what should be in it.
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