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Iridium Spark
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Phil48ACWC View Drop Down
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Joined: 17 Jan 2013
Location: Vermont
Points: 289 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Phil48ACWC Quote  Post ReplyReply Direct Link To This Post Topic: Iridium Spark
    Posted: 13 Sep 2017 at 5:36am
Has anyone found an Iridium spark plug that works well in a WC or WD with WD45 Crank and 7:1 Compression Ratio? Thanks. 
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PaulB View Drop Down
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Joined: 12 Sep 2009
Location: Rocky Ridge Md
Points: 4753 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PaulB Quote  Post ReplyReply Direct Link To This Post Posted: 13 Sep 2017 at 4:25pm
NGK  XR4 is what I've found to be an iridium resistor plug equivalent to an AC R45S through an AC R47S.  NGK plugs have a broader heat rage capability that most any other brand spark plug.  The "S" on the end of the AC plug designates an projected tip design, which helps extend a plugs range a little bit.  
If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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Phil48ACWC View Drop Down
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Joined: 17 Jan 2013
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Points: 289 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Phil48ACWC Quote  Post ReplyReply Direct Link To This Post Posted: 14 Sep 2017 at 12:05pm
Thanks PaulB
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Phil48ACWC View Drop Down
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Joined: 17 Jan 2013
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Points: 289 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Phil48ACWC Quote  Post ReplyReply Direct Link To This Post Posted: 25 Sep 2017 at 1:35pm
I bought a set of these NGK Iridium Spark Plugs from Rock Auto (best price). The full part # is XR4IX / 7189. My WC has never run better.. I had a brand new set of Autolite 295 in there and Number 1 plug would occasionally miss. Number 1 plug had a little color on the porcelain and all the other plugs were clean and like new. I swapped it with # 3 cylinder  and then # 3 cylinder started to miss. So the miss followed the plug. I'll never run a conventional plug in anything I own again. NGK Iridium Plugs are a great product!
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PaulB View Drop Down
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Joined: 12 Sep 2009
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Points: 4753 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PaulB Quote  Post ReplyReply Direct Link To This Post Posted: 25 Sep 2017 at 5:06pm
It's not so much the Iridium plug as the NGK brand. As much as I hate to say it, American plugs are not to quality they used to be. I use the B6S in everything but the pullers, They last for years. I won't ever waste money on Champion, AC or Autolite plugs any more. If I can't get NGKs I'll buy BOSH. 
If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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Phil48ACWC View Drop Down
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Joined: 17 Jan 2013
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Points: 289 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Phil48ACWC Quote  Post ReplyReply Direct Link To This Post Posted: 26 Sep 2017 at 6:28am
I used to have good results with Autolites. Not anymore. AC and Champion were junk 30 or more years ago and in my opinion still are. I'm sold on the NGK Iridium Plugs now. I build my engines with the best parts and procedures to get best performance. This includes Street Rods, Motorcycles , and of course Tractors. Then a spark plug skips and misses???? Unacceptable!!!!!! I'll spend the extra money for quality stuff that performs every time.
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Coke-in-MN View Drop Down
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Joined: 12 Sep 2009
Location: Afton MN
Points: 41609 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Coke-in-MN Quote  Post ReplyReply Direct Link To This Post Posted: 26 Sep 2017 at 9:07am
Odd as the NGK that were in a bike I just bought were about 1000 miles old - tried to start it (NO GO) changed plugs to Champion RN7YC second kick heard that sweet music of a running engine . 
 Only thing 700 miles and bike was hard starting - pulled plugs - slight tan color but wet - put in N5C plugs (non-resistor) first kick back running . 
 Have had good luck with champions over other brands in my Nortons - both Mag ignition and point/ coil systems 
Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
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