It could be me or my setup, but this piston didn't work great for me. I could not get the bike past 38 mph and seemed very limited. I swapped it for the stock piston and my issue was solved. Immediately got into the top and kept going. I'd say don't buy this unless your stock piston broke and/or you're feeling really risky. My setup outside of the 70 Airsal is: low comp head (145 comp), 19 Airsal intake, 19 dell phbg bs (main 82, idle 45, 60 starter, w9 needle), simonini, points ignition, stock/braced 2 shoe w/ blue springs, stuffed crank.
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Fantastic lil piston
April 15, 2021
taco eater :
tnast from State College, PA
I only got it because I was a big dumb dumb and messed up the piston that came with my Airsal kit, so I can't really say anything about before and after.
Put this in your Airsal kit, and it's sure to work! Probably best not to try it on other kits.
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GREAT upgrade for the stock piston
December 1, 2015
taco eater :
Dean Hopkins from Brooklyn, NY United States
This piston went in like a glove. More compression, more torque, less blowby, less piston slap, smoother, and better idle than stock. HIGHLY RECOMMENDED! Some side by side shots: https://www.facebook.com/photo.php?fbid=10153544489408880&set=pcb.1225294334151216&type=3&theater
Hmmm 
Fantastic lil piston