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Replacement Piston Kit for 290cc

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Got a 2nd hand 09 with a big bore kit.

Suspected gaskit leak causing coolant loss. So I figure I may as well do the top end while it's in bits.

I think it's an Athena kit.

Anyone got any tips regarding replacement. Athena, Wisco or other.

I've emailed the store here, and a couple of others regarding kits.

By the way I've done 2Ts before but never a 4T.

I have been thinking about putting it back to stock. Perhaps with a high comp piston as I have the original sleeve. What's the deal there. Will I need to do other work, to the cams for example?

The bikes got a full system, RG3 worked forks, jetted good and rips.

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