Reaper
Well-known member
I've run my NKG Iridium plugs for the last 40,000 miles. Maybe I need to pull them and check them out. 
Iridium plugs on an FJR?
- Thread starter Fred W
- Start date
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Zorlac
Well-known member
Nah, don't do that, remember the SAAB?, you've got 80K to go!I've run my NKG Iridium plugs for the last 40,000 miles. Maybe I need to pull them and check them out.
"This is destined for NEPRT."
This thread has more than enough intelligent discourse to stand on its own, I seriously doubt it'll "recur". :good:
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johnny80s
Turtle Gears
I'm still lost but that's nothing new.
charismaticmegafauna
Well-known member
Surface fire (Surface Gap) plugs are often/usually the coldest heat range available -- so, the heat range (at least too hot) isn't usually an issue. But, they take a ton of voltage to fire....
Conversely, precious metal/fine wire electrode (silver, gold, paladium, iridium, etc) take less coil voltage to force those pesky little electrons to make the jump under pressure. Such plugs work well in permanent magnet magneto systems where the high tension voltage is usually low at cranking speeds.
Speaking of: it would be nice to know the FJR ignition coil's nominal secondary voltage -- either from spec. or empirical data.
RsvlFeej
RsvlFeej
Nah, don't do that, remember the SAAB?, you've got 80K to go!I've run my NKG Iridium plugs for the last 40,000 miles. Maybe I need to pull them and check them out.
Nah, he needs to swap the two 'center'-eroding plugs for the two 'side'-eroding plugs to make it to 80K w/o losing performance.
meosborn
Well-known member
So, it sounds like a dual platinum plug might be a better setup for this bike. Does anyone know if they make some that fit the FJR and, if so, where we can get them?
So I asked and then did the research. Oops. It looks like the Autolite XS4303 has a iridium center electrode and a platinum trimmed side wire. Sounds even better than a dual platinum plug. Of course, I haven't tried it out so who knows.
NGK also makes a plug that has a platinum disc welded to the side electrode but they don't have one listed for the FJR. :angry:
So I asked and then did the research. Oops. It looks like the Autolite XS4303 has a iridium center electrode and a platinum trimmed side wire. Sounds even better than a dual platinum plug. Of course, I haven't tried it out so who knows.
NGK also makes a plug that has a platinum disc welded to the side electrode but they don't have one listed for the FJR. :angry:
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Yup,
Or you could just pay half as much (or less) for the standard NGK's and change them out twice as often.
Or you could just pay half as much (or less) for the standard NGK's and change them out twice as often.
Longrider
Well-known member
Interesting discussion. One point I have not seen relates to the Miles per Gallon. On all of my trips I keep a very accurate record of gasoline used and miles driven. Currently have 60,000+ miles of trips on the FJR and 32,000 miles on my other bike. I use iridium plugs on both bikes 80 percent of the time.
With the stock plugs MPG starts to decrease at about 7500 to 8500 miles. With the Iridium plugs MPG hold up to more than 20,000 miles. This also has held true for the previous 7 bikes I have owned.
So, when the mileage per gallon starts to drop off, I put in new plugs.
As point of reference, my trip to the Canadian FJR gathering was 3682 total miles and the average MPG for the entire trip was 48.219 Miles Per Gallon.
Bruce Waldron
With the stock plugs MPG starts to decrease at about 7500 to 8500 miles. With the Iridium plugs MPG hold up to more than 20,000 miles. This also has held true for the previous 7 bikes I have owned.
So, when the mileage per gallon starts to drop off, I put in new plugs.
As point of reference, my trip to the Canadian FJR gathering was 3682 total miles and the average MPG for the entire trip was 48.219 Miles Per Gallon.
Bruce Waldron
johnny80s
Turtle Gears
Fred, I keep telling you the stock plugs will go 30k.Yup,
Or you could just pay half as much (or less) for the standard NGK's and change them out twice as often.
Fred, I keep telling you the stock plugs will go 30k.Yup,
Or you could just pay half as much (or less) for the standard NGK's and change them out twice as often.
'Zactly. That's twice as often since those fancy Irradiated ones go 60k.
johnny80s
Turtle Gears
Fred do you know what the gap is on the stock plugs? I would like to check mine since I kept them.
I really did put 29k on the stock plugs.
I really did put 29k on the stock plugs.
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Absolutely. 0.7-0.8mm (0.028-0.031").
Smaht guys put them in gapped at the minimum since the gap will grow with wear.
Smaht guys put them in gapped at the minimum since the gap will grow with wear.
johnny80s
Turtle Gears
My stock NGKs at 29k + miles were gapped at: .813, .813, .813, .813
I don't see why we could not pull the plugs every 8 or 10 k and regap or replace them depending on how they look.
I don't see why we could not pull the plugs every 8 or 10 k and regap or replace them depending on how they look.
radman
R.I.P. Our Motorcycling Friend
These guys raced spark plugs, removed 'em from real racin' carz and found out which was really the fastest. The details can be found here-https://weld the fuckkinplugsin/no-one givesaratsass.net
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yeah, I clicked it... :lol: :lol:
I was wonderin', Johnny, how does one measure .813mm? What you scanning those things with? An electron microscope or sumpthin?
Quite marvelous how reproduceable the results were on all 4 plugs...
I was wonderin', Johnny, how does one measure .813mm? What you scanning those things with? An electron microscope or sumpthin?
Quite marvelous how reproduceable the results were on all 4 plugs...
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johnny80s
Turtle Gears
My feeler gauge is SAE and metric. That is the one that fit. It was slightly tighter on two of the plugs so they were not all perfect.
aha!! So that would be the .032" feeler then.
