I cut the piston in half and measured 2mm crown and 2mm sides , will post picture tomorrow , that pretty thick , I will go for 0.8mm thick and a 3mm gudgeon pin , hard dowel pin

I made a con
rod at stock length , its short at 1.5 x the stroke but a cyl spacer would bring it to 2.00 , thats on the long side,

I will put a 4.5 mm dia x 2.8 mm long copper piece in the counterweight for some better balance

Im going to put a big type OS glow , type induction hole in the crank, may as well , the stock hole is pretty small

Its for a C/L slow combat model . and it needs power the stock motor is a bit weak