Wildguzzi.com
General Category => General Discussion => Topic started by: tris on May 08, 2021, 07:49:05 AM
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Afternoon All
Could someone confirm what the plug gap should be on 2017 V9 Roamer please?
The manual I have says 24 to 27 thou, but the plugs on the bike are reading 35 thou :shocked: :shocked:
Given that the bike has only done a few thousand miles since a service by a main dealer before I bought it, you would hope that they got it right!!
Before I sort it out, I want to check that the manual is right before I blame the dealer
Cheers
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Is it reasonable to expect a dealer to check the plug gap?
I tend to think that’s a bit over the top. Why would you think the manual would be wrong?
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NGK's recommended gap is .9 mm/.035".
https://www.ngkpartfinder.co.uk/catalogues/motorcycles/search/plugs/MOTO+GUZZI/801+-+900cc/V9+Roamer/2017/16313/
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Does anyone change the plug gap these days like we used to?
I just put the plugs in and assume the plug manufacturer have it right.
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Is it reasonable to expect a dealer to check the plug gap?
I tend to think that’s a bit over the top. Why would you think the manual would be wrong?
IMO it's good practice to check plug gaps before fitting
Because MG have a bit of a reputation for iffy manuals. I found a second MGref in the user book that says 0.9mm or 1.98 inches. :huh: :huh:
I'd also just found the NGK ref
Maybe 0.9 35 thou is right!!!
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Does anyone change the plug gap these days like we used to?
I just put the plugs in and assume the plug manufacturer have it right.
I gap every plug, right out of the box. Way too wide of gap for Loops and early Tontis. Have to open them up for Mom's pickup.
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Agreed. Good idea to check gaps, they don’t come from the factory gaped for every application.
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I gap every plug, right out of the box. Way too wide of gap for Loops and early Tontis. Have to open them up for Mom's pickup.
OK I had better smarten up then. Funny thing I carry a set of feelers in the tool kit too.
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OK I had better smarten up then. Funny thing I carry a set of feelers in the tool kit too.
I prefer this type of gauge for gapping plugs:
https://shop.advanceautoparts.com/p/performance-tool-spark-plug-gap-gauge-w80540/10075900-p
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I'll play the devils advocate here , how was it running ? :evil: . Peter
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I'll play the devils advocate here , how was it running ? :evil: . Peter
Slightly "fluffly" especially when cold so decided to check the simple/obvious
However, with a bit more research and a think, I've come to a conclusion
1) The NGK CPR8EB-9 plug is a "special" that comes from NGK gapped to 0.9mm (36 thou)
2) As far as I can see Moto Guzzi fit this plug from new
Therefore, I suggest that its HIGHLY unlikely that Moto Guzzi employ a 1st year apprentice in the engine shop to re-gap the new plugs supplied by NGK at 0.9mm down to 0.6-0.7mm (24 to 27 thou) before they fit them
I'm assuming that the 0.6-0.7mm in the manual is an error and shall work with the 0.9mm
Thanks for the input
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I think your asumption is wrong. The V85 is 31 thounds if I recaall and 27 is more in line with the past.
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So now I find after running without gapping new plugs for years.
I set the Loop plugs to 0.6 as per the manual now the talk is 0.9 which was probably closer to the ungapped setting.
What's it supposed to be for a loop?
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Loops or models w/points I set at .024", newer models or ECU, electronic ignitions, high output coils, I set at .028". This is like an oil thread, bend over, how big is your crack. (meant to be humor).
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Loops or models w/points I set at .024", newer models or ECU, electronic ignitions, high output coils, I set at .028". This is like an oil thread, bend over, how big is your crack. (meant to be humor).
That's the thing Steve, I RTFM and this thread wouldn't even exist if MG were capable of putting the same number in 2 of their own documents
To make things worse they seem to have done copy and paste from the V9 to the V7iii and have the same error
:violent1::violent1::violent1:
Moving on though, and taking on board the points raised previously, if I were to reduce the gap to 0.6/0.7 is there any risk to the engine apart from a miss fire for example?
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Yes, Guzzi is known for wrong info in their books. Usually they just use the last models stuff. They came out w/V7 classic in 07 or 8 and they stated 4 & 6 for Heron heads(wrong) and took them till 2011 before they came from factory loose enough to break in the engine. I guess they have no info or tech bullitans from the 70's. They did same thing then and corrected it. Maybe they have no real engineers, just computer software.
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So now I find after running without gapping new plugs for years.
I set the Loop plugs to 0.6 as per the manual now the talk is 0.9 which was probably closer to the ungapped setting.
What's it supposed to be for a loop?
.023" for Loops, what NGK recommends for the application.