Piston size identification

[DirtDiggler69]

I had a air leak crack a piston skirt , so i'm gonna buy a new piston kit and gaskets to put it back together . The Pistons in it are Wiseco Pro-X . I don't have a precision caliper to measure the piston .

The Casting marks are Pro X-31k , there is a 4 cast between the intake ports and on top of the piston there is a 200 stamped on the top of the piston .

The cylinder walls look fine , the left side had a air leak that put a crack in the skirt . I can tell that the left side got hot due to the airleak cause the top of the piston is black , good thing I shut it down when I did because If the skirt broke off I'd be looking for a new crank . if anyone can ID the piston size I'd appreciate it . I'm gonna get a caliper tomorrow or at least borrow one to double check .

[Finch]

Take it to a machine shop of service shop and they'll tell ya

[tedd1]

A broken skirt is usually caused by cylinders that look like ( )...

And, NO, you can't see it. Take them and have them properly measured. It shouldn't cost much to for the piece of mind.

[DirtDiggler69]

I had the pistons measured today and they mic out to be 66mm , I'm gonna have the cylinders mic'd Monday and make sure their iant any further issues . As long as they measure out ok I'll Just do a piston / gasket kit and get a few trips to the dunes and next year resleeve / buy cylinders . I'm sure it was due to my jacked up air leak .

At .080 over , is there the tendency for the cylinders to be ( ) shaped?

Thanks for the help guys .