Author Topic: 2017 V9 Roamer plug gap  (Read 402 times)

Offline tris

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2017 V9 Roamer plug gap
« on: May 08, 2021, 07:49:05 AM »
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
2017 V9 Roamer
2005 Breva 1100 (non ABS) "Bruno" - now sold
1995 Cali 1100 - carby   "Dino" -now SOLD

Offline bad Chad

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Re: 2017 V9 Roamer plug gap
« Reply #1 on: May 08, 2021, 09:49:10 AM »
Is it reasonable to expect a dealer to check the plug gap?
I tend to think thatís a bit over the top.   Why would you think the manual would be wrong?
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Offline Antietam Classic Cycle

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Online Kiwi_Roy

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Re: 2017 V9 Roamer plug gap
« Reply #3 on: May 08, 2021, 10:07:04 AM »
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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Re: 2017 V9 Roamer plug gap
« Reply #3 on: May 08, 2021, 10:07:04 AM »

Offline tris

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Re: 2017 V9 Roamer plug gap
« Reply #4 on: May 08, 2021, 10:08:04 AM »
Is it reasonable to expect a dealer to check the plug gap?
I tend to think thatís 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!!!
2017 V9 Roamer
2005 Breva 1100 (non ABS) "Bruno" - now sold
1995 Cali 1100 - carby   "Dino" -now SOLD

Offline Antietam Classic Cycle

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Re: 2017 V9 Roamer plug gap
« Reply #5 on: May 08, 2021, 10:57:57 AM »
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.
Charlie
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Offline bad Chad

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Re: 2017 V9 Roamer plug gap
« Reply #6 on: May 08, 2021, 12:30:52 PM »
Agreed.  Good idea to check gaps, they donít come from the factory gaped for every application.
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Online Kiwi_Roy

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Re: 2017 V9 Roamer plug gap
« Reply #7 on: May 08, 2021, 11:06:44 PM »
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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Offline Antietam Classic Cycle

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Re: 2017 V9 Roamer plug gap
« Reply #8 on: May 09, 2021, 08:12:45 AM »
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
Charlie
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Offline moto-uno

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Re: 2017 V9 Roamer plug gap
« Reply #9 on: May 09, 2021, 06:24:29 PM »
  I'll play the devils advocate here , how was it running ? :evil: . Peter

Offline tris

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Re: 2017 V9 Roamer plug gap
« Reply #10 on: May 13, 2021, 02:30:00 AM »
  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
2017 V9 Roamer
2005 Breva 1100 (non ABS) "Bruno" - now sold
1995 Cali 1100 - carby   "Dino" -now SOLD

Offline Vagrant

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Re: 2017 V9 Roamer plug gap
« Reply #11 on: May 13, 2021, 03:44:58 AM »
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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Online Kiwi_Roy

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Re: 2017 V9 Roamer plug gap
« Reply #12 on: May 13, 2021, 09:44:07 AM »
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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Offline guzzisteve

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Re: 2017 V9 Roamer plug gap
« Reply #13 on: May 13, 2021, 10:41:46 AM »
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).
« Last Edit: May 13, 2021, 10:56:30 AM by guzzisteve »
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Offline tris

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Re: 2017 V9 Roamer plug gap
« Reply #14 on: May 14, 2021, 01:29:07 AM »
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?
2017 V9 Roamer
2005 Breva 1100 (non ABS) "Bruno" - now sold
1995 Cali 1100 - carby   "Dino" -now SOLD

Offline guzzisteve

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Re: 2017 V9 Roamer plug gap
« Reply #15 on: May 14, 2021, 07:37:41 AM »
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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Offline Antietam Classic Cycle

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Re: 2017 V9 Roamer plug gap
« Reply #16 on: May 14, 2021, 09:10:17 AM »
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. 
« Last Edit: May 14, 2021, 09:20:08 AM by Antietam Classic Cycle »
Charlie
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