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Harley.davidson Spark Plug Question
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1991
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Harley.davidson Spark Plug Question
New MOT guy had a 2 year old Harley Davidson in for a service..... Model...erm big and black.



It had NGK plugs type "MR8L 9". He cannot find these plugs. They don't show up on the NGK website and web search not really helping either. Any ideas please carpedians?
Doin valve clearances? Use dappers valve shim exchange program and the job will be carroty - Free (other than you postin me yer shims) for sporting members.
I've got catalog here but it's a few years old now, nothing in there.

I'd guess this plug is made for HD by NGK and not available by them yet. Bet he can get them via HD at a cost.



Bike details could reveal more.

 

Edit,

Just had a look in the newest online catalog, no MR8L9 in there at all.



Indian has a listing for a MR7F, the only MR I can see.

2002 TDM900 Yellow
Thanks for looking Catte. Think you be right. Too new to be listed and only for that specific model.
Doin valve clearances? Use dappers valve shim exchange program and the job will be carroty - Free (other than you postin me yer shims) for sporting members.
NKG have a code decoder, but that format doesn't quite fit https://www.ngk.com/ngk-spark-plug-numbering-systems

 

I think it means

 

M - Compact

R - Resistor type

8 - Heat range hot to cold, so fairly cold

L - 11.2mm thread length

9  -0.036" gap

 

Some sites seem to list a LMAR8L-9, but that format doesn't quite fit either.

1992 Mk1, 76k miles, Hagon springs, MTC exhaust, 4½ gears Gone now Sad

2009 900 abs, 42k miles, Yamaha heated grips, double bubble screen, R&G crash bungs, scottoiler, Autocom, 1500 lumen LED spotlights.



[Image: post-1-1152402501.jpg][Image: post-1-1150550726.gif][Image: post-1-1150559830.gif]
I have emailed a non dealer Harley dude to see of they can help. My advice, scrap it. (⁠@⁠_⁠@⁠)



Ta for decoder Cwis
Doin valve clearances? Use dappers valve shim exchange program and the job will be carroty - Free (other than you postin me yer shims) for sporting members.
Thought Hayleys had glow plus as they're agricultural diesels 😂😂
<p> Now Sold 😔......850 MK2A 4TX6 in Silver, Stainless steel hand rolled slip on end can, stainless 2into1 headers, K&N air filter, Hagon progressive front springs, Gdogg modified rear shock, Else Made "Ridgeback" Gel Seat, Gdogg under seat fender extender, Powrspark leads, Carbon fiber effect vinyl wrap fairing decals & logos, Michelin Pilot Road2's, V-Strom hand guards, Givi monorack & box (colour matched side rails).
[Image: 2023-05-16_19-37-04.jpg]
I knew all those years at Bletchley Park would pay off

<p class="bbc_indent" style="margin-left:40px;">Single-handedly reviving the Wave.



<p class="bbc_indent" style="margin-left:40px;"> 

<p class="bbc_indent" style="margin-left:40px;">2008 reg. Black TDM 900 ABS



 

 

 
Studley Turing Ramrod from now on 👍😂
<p> Now Sold 😔......850 MK2A 4TX6 in Silver, Stainless steel hand rolled slip on end can, stainless 2into1 headers, K&N air filter, Hagon progressive front springs, Gdogg modified rear shock, Else Made "Ridgeback" Gel Seat, Gdogg under seat fender extender, Powrspark leads, Carbon fiber effect vinyl wrap fairing decals & logos, Michelin Pilot Road2's, V-Strom hand guards, Givi monorack & box (colour matched side rails).
I got a reply after a week from a Harley specialist... they said...we don't got em!
Doin valve clearances? Use dappers valve shim exchange program and the job will be carroty - Free (other than you postin me yer shims) for sporting members.
Quote:I got a reply after a week from a Harley specialist... they said...we don't got em!
Lol  Bunch of nobs.
2002 TDM900 Yellow
Fook me  Lol a very special, specialist then.

Bigred mk1 R1 Calipers- Braided lines- Givi wing rack-Crash bungs- Hi vis bullets-PR2's- and a hoot to ride.



Quad 900 Silver Laser duo tech pipes-Scott oiler-Engine crash bars- Radiator mounted see me ring LED's-Datatool system 3 alarm -Centre stand- Extender fender-Renthal bars-Handle bar risers-Mirror extenders-BMW GS Handgaurds-Acumen uprated horn & Nautilus-Stainless steel Radiator guard-Givi wing rack-OEM screen-Yammy touring screen-MRA Vario-MRA Double bubble cut down for fast as fk riding-Tiger screen-Tank protector-Stomp grip panels-Optimate lead   Gone to Heaven 
Confusedorry:
 

 

1991 MK1 in need of some TLC watch this space   Smile Sorted and on the Road Mick  Tongue  Tongue it's the bike that Jack built  Wink Gone to Heaven  Wub
 


 
Its a sparky plug how complex can it be ?
And why would you need to specially comission a non standard size!!! Poor bloke had a variety of very similar but not identical plugs.... don't think I'd be too keen on fitting a near enough plug on a 2 year old boike.... voiding any warranty etc.



I guess he will have to go direct to Harley dealership to try and get um.
Doin valve clearances? Use dappers valve shim exchange program and the job will be carroty - Free (other than you postin me yer shims) for sporting members.
Quote:I knew all those years at Bletchley Park would pay off
 

 

Quote:Studley Turing Ramrod from now on

Just Googled it :dunno:

 

I agree, its just a fooking spark plug ffs ! Rolleyes


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