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What vehicle(s) do these spark plugs fit?


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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

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  • 2 weeks later...

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

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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.

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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

donation2010.gifdonation2011.gifdonation2012.gifdonation2013.gif
donation2014.gifdonation2015.gifdonation2016.gifdonation2017.gif

donation2018.gifdonation2019.gifdonation2020.gif

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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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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.worthpoint.com/worthopedia/vintage-auburn-18-h-spark-plug

 

But great WLA plug in the box!

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