According to I&T, Super H (aluminum pistons) calls for 2.1 to 2.9.
Mentions "other series H-4" (which I'm going to assume is for iron pistons) at 3 to 4.
Personally I think I would stop if they were beyond 7. With fresh rings it would probably run at 10 with amazing blow-by.
The greater the clearance the greater the chance of skirt breakage so you'll have to make the call on balancing cost effectiveness, even for light duty. Mr. Aaland is right on in that the ring just can not get stabilized.
If there are machine shops in your area, you might be able to get the pistons knurled. You could then file fit each piston to its bore. It's not top tier but will work for light duty. This could be the way to go if the sleeves measure out ok.
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