I have an Airsal on my Puch. I bought it like 5 years ago and just installed it this past spring. I was told it was a 70 but maybe it really is a 65. Not sure? I'm running a 15mm bing and intake with a Techno Country pipe (looks like a biturbo).
I ran a 92 main jet for break in, then dropped down to a 90. Now I'm running an 88 and it might be a little lean.
I'm also running one of those metal mesh high flow filters...
It puts out pretty good power. No polini style power, but pretty good. I've gotten it up to 45 with all around good power once I tuned my 3 shoe clutch... Before the clutch tuning it had semi shitty low end, but once it got into the power band it would pull hard...