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Old 09-27-2016, 05:40 PM
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Join Date: Sep 2016
Posts: 9
Karlyn-STI plugs with Bosch plugs compatibility issues

I recently purchased a set of Karlyn-STI #112 spark plug wires (Part #: 003-159-12-03-M14) and Bosch WR-7-DC+ spark plugs from Pelican Parts and the spark plug and wires don't fit together. The hole that the spark plug would "clip" into inside the spark plug wire boot is too small. What are my other options given that Pelican Parts doesn't have any other plugs or wires for my 1966 Mercedes 250s. I called Pelican and they gladly offered a refund but that still leaves me up s**** creek without a paddle.

Does anyone have another suggestion? I'm guessing these spark plug wires might be for the 1968-1972 250s?

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Old 09-28-2016, 01:19 PM
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Join Date: Sep 2016
Posts: 9
So I got a response from Karlyn/STI about the compatibility issues and apparently you need to remove/unscrew the terminal on top of the spark plug in order to use these wires.

Now while installing them, two of the wires snapped clean at the plug during removal. I'm surprised that these ripped so easy given that I've been told these are of higher quality. Does anyone else have any experience with the Karlyn/STI brand?

I'm giving the wires another chance because the customer service from both Karlyn and Pelican Parts has been exceptional. That and I don't have much options of quality wires for the w108 250s.
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Old 09-28-2016, 03:44 PM
oldsinner111's Avatar
love all animals
Join Date: Nov 2008
Location: bristol,tn
Posts: 5,715
I hate Karlyn wires,they suck.A ebay seller told me they were Bosch. I will buy a bosch set for sure next time.
seems there is hope after all when folks come together
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Old 09-28-2016, 10:11 PM
Hit Man X's Avatar
Join Date: Sep 2004
Posts: 9,086
Thumbs up

Originally Posted by Ronnn View Post
That and I don't have much options of quality wires for the w108 250s.

Try Kingsborne -
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