Sachs 505-1d motor cylinder identification

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Someone brought a Sachs G3 with a 5051d motor for me to work on. Owner said he kept breaking rings trying to install the piston. Can some Sachs experts help me determine if this is a b or d jug?

Numbers on the side read:

0213 246 286

B2

Bottom number:

286

Re: Sachs 505-1d motor cylinder identification

It’s a C or D they both share the same piston,rings and carb but the crank on the D has a longer stroke therefore more HP

Re: Sachs 505-1d motor cylinder identification

Thanks

Tag on the motor says 505-1d 49cc, so I figured it was a long stroke crank. Wasn't sure about the "b2" marking on the jug.

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