[QUOTE=wfopete;20497151] I believe using a standard 490 piston is a common practice in 465 motor builds, which gets you purty close the Maico 490 B/S ratio.
Is this true.
Back in the day I used to run a suzuki RM400 piston in my maico 400. The stroke was the same so the switch would give me 417cc (like the RM) in the Maico. The wrist pin diameter was the same but we had to mill the piston to fit the wider maico wrist pin bearing (if I remember correctly!).
There was a period of time when it was common for the ring locating pin to fall out of the mahle piston. The suzuki piston was reliable and much less expensive.
I have been weighing a variety of 465/490 pistons I have collected and will soon post the info I have collected thus far.