Spark plug gap - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 11 (permalink) Old 07-15-2020, 05:53 PM Thread Starter
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Spark plug gap

Hey Guys,

Ok, gapped new spark plugs on my 2013 FJR.

Haynes says 0.7-0.8mm. The owners manual says 0.8-0.9mm.

More of just a curiosity question, but any idea why they would be different for the same spark plug model?

Thanks,

-HD

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post #2 of 11 (permalink) Old 07-15-2020, 08:52 PM
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My 2007 owners manual says 0.7-0.8 mm. I wonder why yours is different.

Russ
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post #3 of 11 (permalink) Old 07-16-2020, 12:01 AM Thread Starter
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Yeah, it says .8-.9 in the “glove box” owners manual. I used the Haynes manual as a reference when I changed the plugs which broke down the different gen series, but still said .7-.8 for all. I gapped them to .75 but now I’m second guessing myself. Guess I should have just bought the tech manual hah.

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post #4 of 11 (permalink) Old 07-16-2020, 02:58 AM
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2007 Factory Service Manual says 0.7- 0.8 mm but that's for NGK # CR8E plugs. The Gen3 (and hence the Haynes manual) calls for a slightly different plug NGK CPR8EA-9 with gap at 0.8- 0.9 mm.

I think, regardless of which plug number you used, a gap of .75mm will be fine. Unless of course your brain just won't let it go and you just have to regap +.05mm.
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Last edited by rbentnail; 07-16-2020 at 03:08 AM.
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post #5 of 11 (permalink) Old 07-16-2020, 07:39 AM
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Hang, Russ is right. This is what you call “picking nits” but like you I obsess over this kinda stuff but truthfully it it won’t make a bit of difference. Now that said, years ago I read several books by a guy (dr. Michael Jacobs) who was big into ignition systems and developed a great ignition and company (Jacobs Ignition) for vehicles, and he explained in depth the various ignition parts, on spark plugs he was a proponent of using the biggest plug gap the ignition could support because of better emissions, performance & mpg’s.

But w/o a lot of equipment & testing you just don’t know what the ignition will support, so stick with the factory recommended specs and what your them to is fine, don’t sweat it.

Personally, I put in NGK iridium plugs (you don’t gap them) because they provide a better spark but mainly because they should last 60k to 100k. But that’s me. If your bike starts good, doesn’t stutter or miss then you’re good to go , go for a ride and don’t worry about it.

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post #6 of 11 (permalink) Old 07-16-2020, 08:40 AM
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Gen3 got projected tip plugs thus different (Euro 4 emissions coming into play). Perhaps hard to find... you can go back to prior years plugs if you have to. There is an unobtainium Iridium, but CR8EIX or CR8EIX-9, or next heat range down CR9..... don't regap Iridiums.

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post #7 of 11 (permalink) Old 07-16-2020, 09:16 AM
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I have a gen 3 and have replaced my plugs once with the manual's recommended NGK CPR8EA-9 with a gap of 0.8-0.9. The four plugs needed no tweaking of the gap, they were preset by NKG at 0.85, I only checked.
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post #8 of 11 (permalink) Old 07-16-2020, 09:42 AM Thread Starter
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Thanks guys.

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post #9 of 11 (permalink) Old 07-16-2020, 12:19 PM
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Quote:
Originally Posted by FjrjrF View Post
I have a gen 3 and have replaced my plugs once with the manual's recommended NGK CPR8EA-9 with a gap of 0.8-0.9. The four plugs needed no tweaking of the gap, they were preset by NKG at 0.85, I only checked.
Jim at what mileage did you replace yours? Just curious.

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post #10 of 11 (permalink) Old 07-16-2020, 03:47 PM
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Quote:
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Jim at what mileage did you replace yours? Just curious.
about 23k. They could have gone another 25k. Next time I do a throttle body, I will leave the plugs alone from what I seen.
I was doing a throttle body balance, and just figured while it was all open to change out the plugs. The original's coming out were perfectly clean, no carbon build up. The gap on the originals were wider than the new ones. about 0.95 I usually just change anything I can that is changeable when I have something opened up. This winter/spring I had all the tupperware off and Ivan flashed the ecpu, changed the antifreeze even though I changed it the year before, lubricated the brake pedal and whatnot. My bike, my intervals as I see fit, and happy with. I keep a notebook with date and milage and what I've done. I never plan on selling her so it's just for me to keep track. At any given time I can tell how many miles are on my current tires, brake/clutch fluid, headlights, seat, etc.....

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