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Author Topic:   Optimax Spark Plug Gap
SteveGMP posted 06-14-2004 06:31 PM ET (US)   Profile for SteveGMP   Send Email to SteveGMP  
I am changing the plugs on my 2001 135hp Optimax. The new plugs are NGK IZFRG5G. These are a diiferent style, part number, than the original spark plugs. My old plugs were gapped at .040. The new plugs are all at about.025 out of the box. The electrode is tiny; should I try to gap these at .040 or should I install them at .025? I am not sure if I can open these up without breaking the electrode.
dauntlass 18 posted 06-14-2004 06:57 PM ET (US)     Profile for dauntlass 18  Send Email to dauntlass 18     
The plug you are replaceing with is I beleive the Iridium NGK which should be set at .031.The platinum plug was gapped at .043.I hope this helps you.
SteveGMP posted 06-14-2004 09:22 PM ET (US)     Profile for SteveGMP  Send Email to SteveGMP     
Thank you very much for the help. Upon a closer inspection the new plugs, iradium, were right on .031. They ain't cheap and I didn't want to waste any.

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