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@glow_guy avatar
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MP3 400-THMP3R
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UTC quote
I couldn't find any definitive information on this, so thought I would ask the experts before changing out my spark plug. I got two plugs from scooterwest, both NGK, one CR8EKB with twin electrodes and one CR8EIB-10 iridium.
My question is do I need to measure the gap on these or just pick one and put it in? Also, suggestions on which one to try first.
Yesterday I did a belt change and finally made the switch to Dr. Pulley sliders.
Thanks
@bravotwofour avatar
UTC

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'09 Mp3-500 - Gone Now
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@bravotwofour avatar
'09 Mp3-500 - Gone Now
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UTC quote
This is from the manual (below), speaking to copper plugs. I don't recall anything specific given for gap for the iridium plugs... but that was what I installed. Been long enough I don't recall how I set it or if it even needed it.

Characteristic
Spark plug
CHAMPION RG 6 YC
Alternative spark plug
NGK CR7EKB
Electric characteristic
Electrode gap
0.7 รท 0.8 mm


. . . .
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@glow_guy avatar
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MP3 400-THMP3R
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@glow_guy avatar
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UTC quote
Thanks B24. I saw that in the manual, and did some searching on here and came across a post about not gapping iridium because it can snap off. I guess I'm just being paranoid, and finding an excuse not to work on the scoot while it is damp and cold outside.
@roadster avatar
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Molto Verboso
Kymco AK550
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Molto Verboso
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Kymco AK550
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UTC quote
Glow Guy wrote:
Thanks B24. I saw that in the manual, and did some searching on here and came across a post about not gapping iridium because it can snap off.
My NGK Iridium plugs came with the correct gap but if you do need to adjust it only apply force to the outer electrode. The inner one may be delicate and you should not lever against it or force a tight feeler gauge.

Regards Roadster
@bravotwofour avatar
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'09 Mp3-500 - Gone Now
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@bravotwofour avatar
'09 Mp3-500 - Gone Now
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UTC quote
Sent a PM with a cut from the NGK catalog, may be of help. Probably just unclear enough to let you continue to delay and not have to work in the wet weather...


. . . .
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@glow_guy avatar
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UTC quote
Thanks. Not wet today, just cold. I decided to just throw it in there and assume that it was pregapped correctly. What's the worst that could happen, plus I had a backup.

Scooter seems to be running fine.

Not so sure about my torque wrench though. I thought I would be safe and use the torque wrench to get the specified torque, 12-14 Nm, or ~ 9-10 ft-lbs. My torque wrench is one of the click type, and it just didn't seem to be clicking and I thought it seemed like I was putting a lot of force on it. I stopped before I broke something. Any thoughts on how to make sure my tw is calibrated or functioning correctly?
UTC

Hooked
MP3 250
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Location: Sacramento
 
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MP3 250
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UTC quote
You can gap Iridium plugs and here is how you do it
https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxzMjAwMGRvY3N8Z3g6NGUxY2FlNmNkNTQwMjc1OQ
Just don't put "ANY"sideways pressure on the center electrode, and use a round wire feeler gauge.

ROD
@bravotwofour avatar
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'09 Mp3-500 - Gone Now
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UTC quote
rrounds wrote:
You can gap Iridium plugs and here is how you do it
https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxzMjAwMGRvY3N8Z3g6NGUxY2FlNmNkNTQwMjc1OQ
Just don't put "ANY"sideways pressure on the center electrode, and use a round wire feeler gauge.

ROD
That's a welcome addition to my maintenance library - thumb's up. Thanks for posting that!


. . . .
@funkymonkey avatar
UTC

Molto Verboso
MP3 500
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Location: Arlington, Republic of Texas
 
Molto Verboso
@funkymonkey avatar
MP3 500
Joined: UTC
Posts: 1422
Location: Arlington, Republic of Texas
UTC quote
Re: Spark plug gap
Glow Guy wrote:
I couldn't find any definitive information on this, so thought I would ask the experts before changing out my spark plug. I got two plugs from scooterwest, both NGK, one CR8EKB with twin electrodes and one CR8EIB-10 iridium.
My question is do I need to measure the gap on these or just pick one and put it in? Also, suggestions on which one to try first.
Yesterday I did a belt change and finally made the switch to Dr. Pulley sliders.
Thanks
I use the NGK CR8EIB-10
@klaborde avatar
UTC

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2009 MP3/250, 2012 GTS Super 300ie
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Location: Marietta, GA
 
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@klaborde avatar
2009 MP3/250, 2012 GTS Super 300ie
Joined: UTC
Posts: 4308
Location: Marietta, GA
UTC quote
Re: Spark plug gap
Glow Guy wrote:
I couldn't find any definitive information on this, so thought I would ask the experts before changing out my spark plug. I got two plugs from scooterwest, both NGK, one CR8EKB with twin electrodes and one CR8EIB-10 iridium.
My question is do I need to measure the gap on these or just pick one and put it in? Also, suggestions on which one to try first.
Yesterday I did a belt change and finally made the switch to Dr. Pulley sliders.
Thanks
I can speak to the CR8EKB...
Using them on different Scooters, and you just put them in, nothing to Gap.
Best place to purchase them is on Amazon.com, best price I have found.
They are my favorite, they really work well.
@web-tech avatar
UTC

Veni, Vidi, Posti
2008 MP3 500, 2013 BV350, 2020 Vespa Sei Giorni, 2008 Vespa S150
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Veni, Vidi, Posti
@web-tech avatar
2008 MP3 500, 2013 BV350, 2020 Vespa Sei Giorni, 2008 Vespa S150
Joined: UTC
Posts: 8951
Location: Ashburn, Va. Home to the Internet
UTC quote
Plug should be gaped correctly out of the box. Good to check, but no adjustment should be needed.
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