I'm really hoping you can get a 200 to try out for me...my fingers are crossed for ya . Good luck. I'm getting ready to make my 08 CR144 Husky a 165 and it may be exactly what I'm looking for if not I'll be getting the 2012 GG 200 to test for you.
Well you've got 10 years and 10kg on me....haha Which is after I put on 10kg after I broke my arm... haha.
Anyway.
I'm pretty sure my 07 has the 38mm carb, with the screw top, and its jetted really fat compared to the bigger bores, 180/50 I think and a rich needle on a rich clip.
I lowered the squish to 1.7-1.8 using gaskets, ports seemed about right. You could probably go tighter, as a reference I run my 125 at 0.8mm.
I can either ride in the power band in 2nd between the trees, or out of the band in 3rd with 13:50 sprockets. I barely ever get in trouble from having too much power, take that for what its worth. When the band comes on the bike just becomes super responsive, not as though it just got an extra 10hp and wants to rip your head off any chance it gets. It really is easy to ride in the power band.
No worries
Hannes.
The optimum squish clearance is the one just before the piston touches the head Considering these bikes don't rev to the moon (compared to say a track bike) you'll have no issues running 1mm squish. The larger engines require more clearance. Thats a topic on its own.
The CR you choose will be based on your fuels. I covered that in your other thread. With 13.5:1 you should be able to run on 95RON but would probably be better using 98. Higher CR will give better throttle response. Too much compression and not enough octane will cause issues. Increasing the compression ratio will also give some boost to lower and mid range response, but will inhibit the engines ability to over rev as much.