1950 Airone Valve Clearances

[John Martorano]

I have very low compression on a rebuilt 1950 Airone.   Since I haven't adjusted the valves, I suspect that's the issue.  Can anyone tell me what the clearances are?

Thanks , John

[vanuss...@gmail.com]

Just the slightest,.002" is enough. Clearance will increase when hot.

Op dinsdag 2 september 2025 om 22:00:21 UTC+2 schreef John Martorano:

[John Martorano]

Thanks! Is it the same for both exhaust and intake?

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[Gordon de la Mare]

RTFM as they say.

https://www.rpw.it/Documentazione.htm

There are quite a few Airone variants by year and not always easy to find the clearances but if yours is the enclosed valve gear variant then standard clearances are when engine cold , as per Falcone, 0.05mm inlet and 0.1mm exhaust ( that's 2 and 4 thou in imperial numbers)  .  Not necessarily easy to find in the manuals depending on exactly which year

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