ETZ125/150 piston dimensions needed

[Malcolm Thomason]

Can anyone either send me the dimensions of an ETZ125 or 150 piston or donate a knackered piston that I can measure?
I am looking at fitting a Bantam piston to uprate the engine to around 185cc but I need to know if the port timing will work out without too much machining.
Specifically, crown height from gudgeon pin centre line, piston skirt and transfer port cutouts. I know the gudgeon pin diameter is different but I can work around that.
I can return any piston and pay for postage if needed.
Thank you,
Malcolm.

[William Dunstan]

I tried to do something similar with ts150 but could not due to the head sealing arrangement, but did find that a Suzuki ts185 piston was very close to the mz ts piston which I think is different to the etz. the bantam big bore piston is a modified Suzuki ts185 piston. I believe the etz has a higher piston crown, but it may be possible to use the piston by shortening the barrel . by the way bantam racing pistons are available with a 15mm small end asper the mz in a various bores.

Bill

[William Dunstan]

further to my previous reply a piston for Kawasaki ke175 ( disc valve ) may be closer to what you require.
bill

[Malcolm Thomason]

Thank you Bill. That’s interesting about the gudgeon pin diameter.
it would be no trouble to shorten the barrel if the port timing was close enough to play with.
I’m hoping to get the ETZ piston at our monthly meeting so should be able to go from there.
Thanks again,
Malcolm.

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