Like many other two-stroke engines from the 50's also has one of the Sachs 175 18mm spark plug threads. As early as 1982 I had made me a bushing, which allowed me to use a modern 14mm candle. This socket I use now in my prepared cylinder head.
The 18mm spark plug holes in its original condition. 
The prepared bushing. 
The bushing is screwed into the cylinder head (combustion chamber side view). 
The bushing is screwed into the cylinder head (exterior view). 
the spark plug (here a Bosch Platinum W4CP) is screwed into the cylinder head. 
The spark plug is screwed into the bushing in the cylinder head (combustion chamber side view). What does this change?
The engine is 56 years old. 30 years ago we got the big 18 mm candles to buy only sporadically. And different only in 2 or 3 heat levels. I then had already observed that the engine was running with a modern 14mm candle uniform and a little less used. The best results I achieved at the time with the newly entered the market, platinum spark plugs with a ground electrode. This candle I used with success for the Vespa (converted to 135 cc PX80E) scooter my girlfriend. These candles were burning freely well and had virtually no misfires. The hot driven state, the engines were still clean and not after it sparkled when parking. Maybe I will at this point, here are the new taste DENSO Iridium spark plugs, which I drive currently in my Triumph Scrambler. But first must run the engine again - this may take a long time but now no longer ...
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