1.28 Firing order:
The firing order is 1-4-3-2. Looking at the engine from the rear it's:

firewall
3 1
4 2
muffler

The numbers are writing on the tin of the Type 4 engine but your tin is probably so rusty you can see the numbers by the spark plug holes. The firing order is also written on the tin above the coil, and on the Type I engine it's stamped on the generator stand. Look for the word Zundfolge which is German for "firing order".

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