puch e-50 / what is gu-m156

i've got a puch e-50 engine that says GU-M156 right next to where it says E-50. anybody know what that means?

Re: puch e-50 / what is gu-m156

really? nobody? bump

Re: puch e-50 / what is gu-m156

isn´t in TU-M156?

I have a 4-bearing model with this stamped on it, but coudn´t find out so far if there is something special with it

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