I had a chat to Neil Spalding at Sigma about this - I asked him whether boring out by 22 cc was really worth it, but apparently it's also the hi-comp pistons that make a difference.
There are other alternatives. By going to 96 mm pistons and the standard crank you can go to 984 cc.
Neil reckoned that the 966 conversion made for a very nice engine with the same charateristics as the standard bike, but on steroids, especially with the cams dialled in and a 'full monty' service to get everything on spec. However I decided against it. To do a 966 conversion properly, he reckoned on about 2K. At the end of the day, it's still only an ST2 and I considered spending 2K on mine to be overspending on the bike, better to trade it in and spend the 2K on upgrading it to an ST4S IMHO.
Don't get me wrong, I love my ST2 and I still have it, it's a long way from being a sows ear, but still not worth trying to make a silk purse out of it
Jools
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