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To remove gudgeon pin (wristpin) remove the clips part number 10297, see parts manual plate 2 for illustration.
If it’s an alloy piston, with clips removed, suspend it in a pan of boiling water for five minutes and it will probably expand enough to allow the pin to be just pushed out. Failing that make a tool similar to this to push it out. No apologies for its rather crude appearance as I made it in about 1960 when playing with Lambretta scooters. Amazing how many pins it’s pushed out on a variety of engines since then.
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John E-W
Every day’s a school day. What I thought was a split pin is the bottom piston ring divider. I attach a photo.
John
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The split pin is there to stop the rings turning in the groove. As a 2 stroke it is important that the ring gap does not line up with any of the ports in the cylinder bore, this could happen if the rings did not have the split pin to prevent then moving.
Seems a fairly crude way of achieving the desired result. Is the split pin an original feature or some “Bush mechanic’s” bodge after a happening of some sort?
Even Villiers have a more elegant way of doing it.Attachments:
Hi
The engine builder is finding it very difficult to remove the piston ring pegs on my piston (part numbers 5268 and 5269) Have any of you done this or are they available to buy. I seem to remember reading somewhere that there might be a fellow in Switzerland selling some parts for these Simars. I attach pics.
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