Piston/cylinder clearance

[rocksalt27]

What should it be? I actually couldn't find it anywhere.

 

[crassius]

all over the map with these (probably why there's so much diff in how diff motors run)

rings are worse

 

[rocksalt27]

Any idea what would be good then? I believe 2 or 3 thousandths is standard.

 

[sbest]

Any idea what would be good then? I believe 2 or 3 thousandths is standard.

Yes, on an air cooled 40-47mm with a cast piston, this will be in the ballpark.
Forged pistons require more, water cooled require less.

Steve