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Author Topic:   Great Web deal for Optimax Sparkplugs
bsmotril posted 06-17-2003 11:01 AM ET (US)   Profile for bsmotril   Send Email to bsmotril  
Found a sale going on for the NGK Platinum plugs used in the small block Optimaxes. Don't know if the big block motors use the same plug; PZFr5F-11. Price $8.75ea @


prm1177 posted 06-17-2003 04:54 PM ET (US)     Profile for prm1177  Send Email to prm1177     
the site now shows them for $34.99.
bsmotril posted 06-18-2003 08:48 AM ET (US)     Profile for bsmotril  Send Email to bsmotril     
That is for a box of 4 which comes out to $8.75 ea.


prm1177 posted 06-18-2003 02:19 PM ET (US)     Profile for prm1177  Send Email to prm1177     
Dick posted 06-18-2003 10:16 PM ET (US)     Profile for Dick  Send Email to Dick     
The NGK PZFR5F-11 plugs have been superseded to NGK 1ZFR5G, Merc part number 33-889597001.
I don't sell on the forum but to give you an idea, Merc list price is $14.80 ea and I sell them for $12.50 ea.


bsmotril posted 06-19-2003 10:44 AM ET (US)     Profile for bsmotril  Send Email to bsmotril     
Yeah, I saw those, but they were listed for light duty, where the Platinums are listed for Severe Duty. I run a lot at minimum planing speed, which I consider severe duty and am lucky to get 60 hrs from a set.
lhg posted 06-19-2003 02:40 PM ET (US)     Profile for lhg    
With an Optimax (or Ficht or HPDI for that matter) how does one know that the plugs have to be replaced, so with so few hours? Factory recommendation?
bsmotril posted 06-19-2003 03:30 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
My engines tells me it is time to replace plugs when I get a miss around 2800 rpm. That is the top end of the stratified charge lean burn mode where a bad plug will show up first. May also miss at WOT.
dauntlass 18 posted 06-19-2003 08:02 PM ET (US)     Profile for dauntlass 18  Send Email to dauntlass 18     
Platinum plugs last many,many, hours of use.I expect 200 to 300 hours of use.If you inp the center electrode you should find a pretty square electrode end.I am old fashion I sand blast plugs if they become foulded.Clean sand out of plug end and reuse plug.On my Optimax engine at about 100hr. use the plugs are like new.The engine came with Champions and the electrodes showed wear and rounding of electrode at about 50 hours use.And were fouling constanly.The Champions were not platinum.NGK work great in my engine.
bsmotril posted 06-23-2003 03:10 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
I just pulled mine this past weekend. All twelve were a nice even tan and the electrode and gap were fine. They have 68 hours since the last set. Did find a loose spark plug boot. Hopefully that is the source of my intermittent miss. I'll find out for sure next weekend.

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