Gen 3 spark plugs 22k - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 41 (permalink) Old 04-12-2017, 05:09 PM Thread Starter
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Gen 3 spark plugs 22k

I changed my plugs at 22k miles today, The plugs looked good but were a little out of spec .9mm
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post #2 of 41 (permalink) Old 04-12-2017, 05:46 PM
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They look typical, and they make a complete nonsense of the Yamaha change interval. I can see a little wear on those plugs, but nothing that would have caused any real issues.

I changed my Iridium Plugs recently. They were still measuring at 0.032" and looked almost perfect. I estimate they had been in the bike for at least 40k miles.

On the Windstar, a vehicle notoriously difficult to get to #1 plug, I changed that one at 106000 miles. According to my OBD II scanner, it was still performing just fine.
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post #3 of 41 (permalink) Old 04-12-2017, 06:06 PM Thread Starter
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I will probably go 30k on this set.

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post #4 of 41 (permalink) Old 04-12-2017, 07:06 PM
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Remember that maintenance is PREVENTATIVE in most circumstances....the aim being to replace the required parts (etc) BEFORE an issue occurs....not wait until something goes wrong, then replace. Spark plugs most likely COULD last much longer, but if by replacing them at that stage the chances of experiencing an issue are reduced....isn't that the whole point of maintenance?

Otherwise, why would you replace your engine oil before it has lost most of its lubricating qualities, or why would you replace your air filter before it's totally blocked and is restricting airflow?

Food for thought.

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post #5 of 41 (permalink) Old 04-12-2017, 07:22 PM
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Who said anything about waiting for things to go wrong.

Yamaha specifies 8000 miles for a plug-change interval. That's not preventative, it's a complete waste of time and money. Over the years many riders have clearly demonstrated that spark plugs will easily go two to three times this distance, with no effect on reliability at all.

So we figure out sensible intervals, which folk can choose to follow, or choose not to but at least they are making a more informed decision.
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post #6 of 41 (permalink) Old 04-12-2017, 08:04 PM
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30k would seem reasonable on non-iridiums, at least in my mind. If you see any performance issue/sudden mpg decrease, then a plug may be breaking down and time to replace then. Catastrophic failure isn't likely, but you could always put a spare new plug in your kit (as we did in the old days when things weren't so reliable, and a definite requirement for 2-strokers).

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post #7 of 41 (permalink) Old 04-12-2017, 08:28 PM
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I agree with Ray. I changed mine at 33K miles and gap was opened up a bit but did not affect operation or fuel mileage.
I would do plugs and valve clearance check at 25-30K, as well as airfilter.

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post #8 of 41 (permalink) Old 04-12-2017, 08:30 PM
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Quote:
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(as we did in the old days when things weren't so reliable, and a definite requirement for 2-strokers).
Ha!

Those plugs were either all black, or all white. Both are a problem and getting them to go 2000 miles was a struggle.

I think that may contribute to the reasons folk think they still need regular changing.

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post #9 of 41 (permalink) Old 04-12-2017, 08:33 PM
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This is why I advocate the keeping of complete logbook with vehicles including every fuel purchase. If something is going amiss, such as spark plugs, it will probably appear ias decrease in MPG before one otherwise notices. If it seems to be running well and MPG is in line then air filter and spark plugs are fine.

If performance and/MPG falters then the first suspect is fuel source. If not that, then when parts are replaced MPG should return to prior range proving one fixed the correct thing with appropriate parts.

My first two automobiles had points in the ignition. One could plot MPG vs miles. Made easy calculation for cot of gasoline vs new points. Of Standard Blue Streak points vs cheap generics at K-Mart. One car would get 22 MPG on new Blue Streaks, quit running about 18 MPG. I never found an electronic retrofit kit that inspired enough confidence to reach into my pocket. Traded the car before aquiring the knowledge to try to build one myself.
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post #10 of 41 (permalink) Old 04-12-2017, 08:40 PM
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I use an Android App called "aCar" for that very purpose.

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