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What vehicle(s) do these spark plugs fit?


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#26 oldabewla

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Posted 26 March 2019 - 09:30 AM

Harley made new WLA's for the US Army these motorcycles were made from 1949-52 as 49WLA-52WLA

All the WWII 42WLA Harley motorcycles with their spare parts shipped overseas during WWII were left overseas after the war none came back so when Korean War started up there was a need for more bikes and parts.

The WWII spark plugs came in a orange and black Harley ordnance box with red cellophane wrap for overseas shipping these were only done this way during WWII.

In 1948 the MC plugs were built smaller for hotter spark.

Craig

#27 hirsca

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Posted 07 April 2019 - 04:21 AM

Harley made new WLA's for the US Army these motorcycles were made from 1949-52 as 49WLA-52WLA

All the WWII 42WLA Harley motorcycles with their spare parts shipped overseas during WWII were left overseas after the war none came back so when Korean War started up there was a need for more bikes and parts.

The WWII spark plugs came in a orange and black Harley ordnance box with red cellophane wrap for overseas shipping these were only done this way during WWII.

In 1948 the MC plugs were built smaller for hotter spark.

Craig

 

Thanks Craig.  Did Harleys ever use this type/size spark plug?

 

Thanks again, Al



#28 '42PEEP'sMotorpool

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Posted 18 April 2019 - 05:36 PM

The best way to figure it out will be through the stock number.

 

I was able to find a similar number for parts of the tail light of the M21 trailer from the WWII era is coming up as "H004-504417", "H004-504420", and "H004-504423", clearly the sparkplugs aren't for the trailer, but since they seem to share a similar stock number, it might help lead you to whatever it was made for. 18mm spark plugs weren't uncommon at the time though, so it's hard to narrow down what it was for.



#29 hirsca

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Posted 19 April 2019 - 11:26 AM

The best way to figure it out will be through the stock number.

 

I was able to find a similar number for parts of the tail light of the M21 trailer from the WWII era is coming up as "H004-504417", "H004-504420", and "H004-504423", clearly the sparkplugs aren't for the trailer, but since they seem to share a similar stock number, it might help lead you to whatever it was made for. 18mm spark plugs weren't uncommon at the time though, so it's hard to narrow down what it was for.

 

Thank you for the lead.  I will start looking down that path.

 

Thanks again, Al



#30 '42PEEP'sMotorpool

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Posted 19 April 2019 - 06:44 PM

 

Thank you for the lead.  I will start looking down that path.

 

Thanks again, Al

 

Hi, good luck and if you figure it out, post the answer. I'm now curious what they were for too.



#31 oldabewla

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Posted 20 April 2019 - 06:58 AM

WWII WLA Harley Spark plug and box 18mm !!! GOV only.
The civilian HD box was dropped after WWII this was odd during WWII because all other parts supplied to vehicle's were in a plain cardboard or paper type packing with part numbers.
HD used it's civilian number system even in the military production.

Craig

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#32 '42PEEP'sMotorpool

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Posted 20 April 2019 - 08:20 AM

WWII WLA Harley Spark plug and box 18mm !!! GOV only.
The civilian HD box was dropped after WWII this was odd during WWII because all other parts supplied to vehicle's were in a plain cardboard or paper type packing with part numbers.
HD used it's civilian number system even in the military production.

Craig

 

Hi, 

 

The plug in the tube looks longer: https://www.worthpoi...18-h-spark-plug

 

But great WLA plug in the box!



#33 oldabewla

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Posted 20 April 2019 - 01:08 PM

Harley changed to the smaller longer size plugs in 1950


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