Boxerworks.com

I don't know where the OP got these spec's from but they ring true as the original 6 volt coils were 1.2 ohm even though they are often refereed to as 1.5 ohms. None of the VW parts suppliers I've looked at give any detailed specs.

1.2 ohms resistance each x 2 wired in series = 2.4 ohms
Input voltage = 6V
Primary resistance = 1.2 ohms
Secondary resistance = 13.84Kohms
Primary inductance = 1.25mH
Voltage output = 40,000 to 50,000 volts

I cross referenced the part number when searching for specs and found this...

https://www2.cip1.com/ProductDetails.as ... 21-124-001

I think that my shop used the Bosch VW coils often. Just use longer bolts for mounting and they work just fine.

I've just fitted these Bosch 6v Beetle coils to my 1976 R75/6, they cost me £81.00 here in the UK, and to say I'm pleased with the transformation to the starting and running of the bike would be an understatement, money well spent in my opinion.

Here is the number I have for the coils; Bosch 0221124001 6 Volt. They were the same diameter, just a bit longer. Starts great now.