1946ish Zurcher -Derny - 98cc - Engine Details

Discussion in '2 Stroke Bicycle Engines & Kits' started by klwinter2, Feb 13, 2020.

  1. klwinter2

    klwinter2 New Member

    Feb 13, 2020
    Likes Received:
    I Bought this COOL OLD Bicycle Engine.
    I have been able to determine it is a 1946ish Derby-Zurcher 99cc Bicycle engine.
    I see it called a CLIP-on engine..

    Thats all I can find..
    Can anyone offer any OTHER details please?

    I have it on the bench to test.. But I need to know the static timing for the divorced distributor..

    Thanks for your time.
    Kenneth in TN

    Attached Files:

  2. FOG

    FOG Well-Known Member

    Mar 3, 2019
    Likes Received:
    Cool motor! Assuming it has points best guess is you set them with the head off and a dial indicator on the piston. Again a guess, but if the points open at 1mm BTDC you should be safe.

    By comparison spec on my old 360 is 2.6-2.8mm BTDC and I'd expect a smaller motor to need less timing.

    Hope that helps.

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