Which type of spark plugs

opus68 · 06-29-2009, 09:32 PM

I'm replacing my spark plugs and yamaha calls for NGK LFR 6A-11s. These are the "standard" plugs. I also saw that they make iridium plugs NGK LFR 6AIX, which are called "premium class".

http://www.ngk.com/results_appOther....=218901&mfid=1

Which ones should I use? Do the iridium plugs provide better or longer performance?

Thanks

outbrdwrench · 06-29-2009, 10:35 PM

The regulars usually are good enough. But if your motor is sound (5% or less leakdown) & induction/combustion ratio is at 14:1, irridium plugs will definitely last longer however you will notice no difference in performace. In laymens terms use em if you can afford em! outbrdwrench.

opus68 · 06-30-2009, 06:22 PM

OK, I ordered them. We'll see how they work.

06-29-2009, 09:32 PM	#1
opus68 Senior Member Trigger Join Date: Sep 2007 Posts: 212	Which type of spark plugs I'm replacing my spark plugs and yamaha calls for NGK LFR 6A-11s. These are the "standard" plugs. I also saw that they make iridium plugs NGK LFR 6AIX, which are called "premium class". http://www.ngk.com/results_appOther....=218901&mfid=1 Which ones should I use? Do the iridium plugs provide better or longer performance? Thanks

06-29-2009, 10:35 PM	#2
outbrdwrench Senior Member Mingo Join Date: Apr 2009 Location: Pace, Florida Posts: 133	RE: Which type of spark plugs The regulars usually are good enough. But if your motor is sound (5% or less leakdown) & induction/combustion ratio is at 14:1, irridium plugs will definitely last longer however you will notice no difference in performace. In laymens terms use em if you can afford em! outbrdwrench.

06-30-2009, 06:22 PM	#3
opus68 Senior Member Trigger Join Date: Sep 2007 Posts: 212	RE: Which type of spark plugs OK, I ordered them. We'll see how they work.

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