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View Poll Results: Brisk, NGK Iridiums, stock or other

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  • Brisk

    1 0.44%
  • Iridiums NGK

    139 60.70%
  • Stock NGKs

    85 37.12%
  • other

    4 1.75%
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  1. #21
    2007 FZ6 TownsendsFJR1300's Avatar
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    Re: Spark plug choice...

    Quote Originally Posted by Cali rider View Post
    That was me. In my particular case I found that performance and mileage decreased over a 10,000 mile interval to the point of having misfiring under load. After changing back to the standard NGK plug all of my problems have disappeared.

    The thread in question: http://www.600riders.com/forum/fz6-t...ey-appear.html
    I knew that!!! Actually I remember the thread obviously but not the poster,

    You didn't happen to check the gap of the iridiums when you took them out and see if the gap opened up some (with wear and tear)?
    Scott
    2007 Yamaha FZ6- BD43 headlight mod, PIAA bulbs, Stebal air horn, Scorpion SS pipes-(no DB killers), Speedohealer, HEL SS brake lines, Fenda Extenda, K&P SS re-usable oil filter, custom mounted BMW style electrical outlet(L.S.), Techmount GPS mount with handlebar bar risers/set backs, additional helmet lock, custom mod'ed seat(Spencers), Hyper light-rear running/brake light, custom radiator/fan protector, Techspec tank pads, Grip Puppies, Yamaha rear rack with custom aluminum flat rack.

  2. #22
    Super Member Red Wazp's Avatar
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    Re: Spark plug choice...

    Quote Originally Posted by Cali rider View Post
    That was me. In my particular case I found that performance and mileage decreased over a 10,000 mile interval to the point of having misfiring under load. After changing back to the standard NGK plug all of my problems have disappeared.

    The thread in question: http://www.600riders.com/forum/fz6-t...ey-appear.html
    John, I wonder if you didn't have a bad plug. Never heard of a iridium fail like yours in such short mileage.
    I have well over 25k on two sets in my Feejeer with no performance issues.


    Burning fossil fuel and loving it!!

  3. Thanks Motogiro thanked for this post
  4. #23
    Junior Member Spark plug choice... mave2911's Avatar
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    Re: Spark plug choice...

    Quote Originally Posted by Red Wazp View Post
    John, I wonder if you didn't have a bad plug. Never heard of a iridium fail like yours in such short mileage.
    I have well over 25k on two sets in my Feejeer with no performance issues.
    I've noticed an obvious and dramatic decrease in fuel efficiency since changing to the Iridium plugs.

    One observation is that the standard copper plugs are dual pole negative, so adjusted correctly, this should result in a more complete combustion.

    Also, apparently Iridium isn't as conductive as copper, so there will be potential losses there too.

    I'm giving the Iridiums a decent run, but they've been in there for nigh on 10000kms (6200mi). My 'major' service is due in 4300kms (or thereabouts) and I was thinking of putting stock NGKs in two tanks before the service - just to get an acceptable sample size.

    If it instantly increases, I'll have two tanks, or 8 days travel to work to get a result.

    That way, at or after the 40000kms service, I'll know what I want to run.

    Cheers,
    Rick

  5. Thanks TownsendsFJR1300, Motogiro thanked for this post
  6. #24
    Junior Member PhotoAl's Avatar
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    Re: Spark plug choice...

    Someone asked about the E3's - junk! My son put them in his Vibe GT which has a high output Toyota motor. Ran rough, gas mileage was not improved which is a big deal for a grad student. When he came to visit I swapped out for platinum plugs which ran much better and got rid of the rough idle.

    Ran stock NGK plugs changed to iridium plugs, much smoother idle could not tell much difference in performance at 28,000 miles went back to stock NGK (what the dealer had in stock) and have not noticed any real difference.

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  8. #25
    formerly Anakin StarRider Darth Fazer's Avatar
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    Question Re: Spark plug choice...

    Don't the OEM spark plugs have a double ground strap or something goofy like that? Does that make a difference? Can you get that with an aftermarket plug like NGK or do I have to get those dual strap plugs from the dealer? Who makes the OEM?

  9. #26
    Vrrroooooom! Spark plug choice... Motogiro's Avatar
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    Re: Spark plug choice...

    I mentioned on another thread that the factory settings for the gap on the Iridiums was greater than the specified setting for my SV10000s. One catch all gap for a plethora of different applications of that same plug! I opted to set my Iridiums to the gap specified for my bike's manufacturer. I was also very careful not to put mechanical pressure on the tiny Iridium tip, moving only the ground tang and using a wire gauge to set the gap.
    That tip is laser welded in place. If you damage the tip, install the plug and that little Iridium tip breaks, you could be in for some expensive bad news. This may be why there is one size fits all gap.

    Proper gap and combustion efficiency is predicated on a few factors and I think the primary consideration is the coil secondary voltage. After that there is compression ratio, RPM, heat range, A/F ratio etc.

    With lower secondary coil voltage you will need a smaller air gap. With higher coil voltage you can use a wider air gap. Coil voltage is related to the air gap between the center electrode and outer/negative electrode.

    I think the advantage of the Iridium plug is the very small target area the spark hits to complete it's journey. I believe the theory is this creates a more accurate spark in the same spot with less variation. This would also create a smaller concentrated area for the same amount of electrons to travel in
    This is probably why they use the tiny Iridium tip. A small softer alloy would loose metal very quickly in an application like this. A larger target area provides a more varied target and less consistency of spark and may also have more variation under compression.

    This Youtube is in Russian but the outcome is a test under different amounts of compression between a standard plug and an Iridium plug. The Iridium plug wins in this comparison but is it the right all round plug choice?

    This test may mean nothing. The stock plugs are fine and maybe even better all round performance for our bikes.
    We fall for many marketing gimmics and I believe there are many variables in applications to consider that may not be obvious in the beginning.

    In this test are the gaps set the same? Is the guy using the same secondary voltage? Is the compressed gas the same properties as air to fuel ratio gas in an engine? Is he selling more expensive Iridium plugs? These are all factors in our science today.

    Last edited by Motogiro; 09-04-2015 at 09:59 PM.
    If you can't fix it by hitting it with a hammer, it's electrical!

    Clif
    SoCal Hoon

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  11. #27
    Keep moving!!!! Guitar Man's Avatar
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    Re: Spark plug choice...

    In that video the first plug looked like it was pretty well used. I wonder if the same plug new would look any brighter? Seems like they could have done a better comparison.

    I use the standard plugs. My bike runs like a top and is all stock. I can tell the difference in performance after changing the plugs at 8,000 miles. The resistance changes over the life of the plug. I don't bother to check them at 4k like it says to do if the bikes running normal.

    I figure the engineers knew what they were doing when they designed the engine. I'll stick with that.
    51,600 miles on my 09 FZ6. U.S.:Alabama, Arizona, California, Colorado, Florida, Georgia, Louisiana, Mississippi, Montana, New Mexico, Nevada, North Carolina, Oregon, Tennessee, Texas, Utah, Washington, Wyoming. Canada: Alberta, British Columbia.

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  13. #28
    Vrrroooooom! Spark plug choice... Motogiro's Avatar
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    Re: Spark plug choice...

    Quote Originally Posted by Guitar Man View Post
    In that video the first plug looked like it was pretty well used. I wonder if the same plug new would look any brighter? Seems like they could have done a better comparison.

    I use the standard plugs. My bike runs like a top and is all stock. I can tell the difference in performance after changing the plugs at 8,000 miles. The resistance changes over the life of the plug. I don't bother to check them at 4k like it says to do if the bikes running normal.

    I figure the engineers knew what they were doing when they designed the engine. I'll stick with that.
    If the comparison was the same amount of atmosphere pressure and the spark voltage is the same, the comparison is pretty impressive. You can see as the compression increases the Iridium seems to continue to fire where the other plug fails.
    My message is mainly set the plug you're using to the factory Yamaha FZ6 spec. for the gap, what ever plug you use.
    If you can't fix it by hitting it with a hammer, it's electrical!

    Clif
    SoCal Hoon

  14. #29
    Keep moving!!!! Guitar Man's Avatar
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    Re: Spark plug choice...

    ^^^ Right.
    51,600 miles on my 09 FZ6. U.S.:Alabama, Arizona, California, Colorado, Florida, Georgia, Louisiana, Mississippi, Montana, New Mexico, Nevada, North Carolina, Oregon, Tennessee, Texas, Utah, Washington, Wyoming. Canada: Alberta, British Columbia.

  15. #30
    Junior Member philz's Avatar
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    Re: Spark plug choice...

    I recently replaced my stock plugs with NGK iridiums. If I'm totally honest I can't tell any difference but the price difference was negligible so I thought I'd give them a try.

    I also use NGK iridiums in my car too. Can't tell the difference in that either.

    Maybe it's marketing hype, maybe not but for a few quid difference it's worth a try.

 

 
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