Hondas answer would be to fit a new cylinder block, which with labour and gaskets etc, would cost proberbly as much as the bike is worth.
The good news is you may be able to use a helicoil kit to repair the thread. This is pretty inexpensive, and involves drilling the damaged threaded hole oversize, retapping, then inserting a stainless steel thread. Many bike shops offer this service, but be aware that any swarth from drilling etc must not get into the threaded hole as this could block waterflow or seize the water pump. It may be necessary to remove the block to do a good repair and flush away any metal swarth.
I am assuming it is just the thread that has stripped? If you have cracked the surrounding cylinder head then I'm afraid it will require the head and barrells to be removed and either the repair alloy welded, or a replacement head fitted.
good luck.
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