Quote:
Originally Posted by Masteryota
The big bore is worth it, but wait till you need to pull the cylinder first, it won't be long knowing these GY6 engines. Go with the A12 cam for low end grunt. The cam, IMO, is more bang for your buck. Be sure to mod the CVT to match the power curve with the cam change
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From what I have read and info I have gathered from others A12 is well worth it.
The BBK I am getting ready to purcase is a no bore kit, which includes larger valve head and a12 cam too.
The 58.5 will bring you to 155cc. The 59mm (also a no bore crank case) will bring you up to 160cc but I hear the cylinder walls are very thin and no room to increase if needed in future.
I have already disassembled mine and it is a cake walk.
http://www.youtube.com/watch?v=9eZ8SIDyyuY
here is a simple video to follow with.
FYI, no need to remove motor, just seats.