View Full Version : Merc Optimax 250 Spark plugs
04-22-10, 01:13 PM
Does anyone have Service Manual for Merc 250 Optimax?
I need to know what Spark Plugs are specified for the motor,
and gap too...
04-22-10, 06:51 PM
Since you are a premium member, you can get it here. But...
Hope that helps :cheers:
04-24-10, 08:21 PM
I found NGK ZFR5F-11
(no P) NGK PZFR5F-11
what does the P represent?
Is there a iridium plug available?
05-27-10, 09:36 PM
Bought the plugs the manual advised : NGK PZFR5F-11
Turns out they are not the only type!
My motor uses IZFR5G (still Laser Iridium type)
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