Ring end gap 500 air cooled

How much ring end gap should I have on a freshly bored 87,42 air cooled cylinder.
I'm thinking about 0,6mm it's 0,5mm right now.

Hi Bart.

That sounds a little on the tight side. Before you file it to 0.7, check that you have at least 0.08m/m clearance between the piston and bore. I am wondering if it has been bored too tight and the small ring gap may reflect this? If in doubt, get it honed out a bit, as when a bore is worn it is usually by a lot more than 0.01 / 0.02 ! Better a bit slack than a siezure!

Andy.

I am now boring my cylinders out larger to .004 on 430s and 500s In hot Texas I just need the extra clearance

Really if you look at Husky spec sheets - that is what they have listed.

Yes, I think that is a good idea. The poor quality of modern fuel is not helping either....

Andy.

I've got an 84 500 that seized after a rebore and new wossner-it should have been bored to wossner spec 0,08mm clearance for a 87.42 piston. Is this the clearance ok?
I'm measuring 87.47 at the top of the bore in 4 axis, 87.5-87.53 mid stroke and 87.53-87.6 at the bottom. I'm not sure where the spec 87.42 is measured on the piston ,I'm assuming they are manufactured not perfectly round or parallel as my piston measurements have a range of 0.15 mm variation .
The bottom line is I've investigated the possible causes of the seizure and haven't n discovered anything positive , I'm wondering if the piston bore clearance is tight in spots or the wossner spec is too right ? Any thoughts? I did post a thread on possible causes a few weeks ago, but this question is specifically about the clearance on a 500 aircooled wossner piston.
Ring end gap is 0.46mm

gday, have you done a plug reading to determine if the engine may be running to lean? The other thing that comes to mind is allowing a proper break in before hammering it. Theres nothing more fun than seeing how well that new bore job will run by opening it up for long periods. I know I've been there.