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Hi Sarbutt, I aint no expert with small frames/engines and I'm pretty sure there will be people with more experience than me that can give you better advice.
I do know that a lot of the small frame geezers fit lighter flywheels on their kitted motors, if you're needing one anyway then why not?
I get a lot of my scooter kit from here;

http://www.beedspeed.com

and have done for years, the lads there are very knowledgeable and will guide you through any alternatives that will suit I'm sure.
There are lots of other good dealers to, just pick up a copy of 'Scootering' to find out if there is anybody else nearer to you to save on postage

Another good place for small framers to hang out and glean some advice is Chunks' small frame forum;

http://davedaniel.proboards.com/index.cgi? (hope this is ok with the admin here!)

...these guys are nuts about small frames and up to all sorts of shenanigans with small frame tuning/mods etc.

Also as far as I'm aware the PK never came in a 110cc, I'm guessing it was probably a 100cc stock.

Hope this helps