The stroke of a Puch Maxi engine is 43mm indeed! 🙂

If you need more “construction”-information you should check this site out:
http://www.puchmaxi.nl/constructiegegevens.php

Best regards,

Hmm thats indeed some very intresting information:duivel

45mm kit on a simo engine:P puch cilinders have got 4 mounting holes.
and they are a lot cheaper then a simo cilinder.

when i got my puch , the first thing i dit was mounting a 44mm airsal cilinder:P
it was a beast with a moderate setup, it diden`t go fast but it has a lot of torque 😛

great idea

this one seems good

and a friend of mine has got 2 of these cilinders

hey but jou need to tune your point of ignition.
that was the problem with my puch. but when i adjusted the timing it went ballistic 😛

and those cilinders have got a great tuning possibility

this seems promesing 😛

my expearience was not so good with the stock 50cc (snel)
the cilinder that was on there performed better.

and it looks somewat like yourse, but less ports.
i think youre better off with a 43/47mm cilinder because it gives up more crankcase compression:P .
that might run @ 60/70 kph when untuned with that 50cc cilinder