1946ish Zurcher -Derny - 98cc - Engine Details

klwinter2

New Member
Feb 13, 2020
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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
 

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FOG

Well-Known Member
Mar 3, 2019
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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.