Some kits may need you to bore for it and others are no bore needed. If you buy from ebay and it says no bore needed and it is incorrect, they have to take it back by ebay policy.
In most cases, 61mm is the largest you can go without the need to bore.
Here are a few link to current ebay auctions I am sure there is more:
Taida is the best of the best:
http://www.ebay.com/itm/Scooter-GY6-...NZg40U&vxp=mtr
http://www.ebay.com/itm/GY6-150cc-Hi...hZifud&vxp=mtr
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Buggy 1
150cc Buggy
A12 Cam, 12g Sliders, Ban Jing Bell, NCY Green Clutch, 24mm Carb, 115mm Koso variator ramp, redneck intake, uni filter, straight through exhaust.
Guang Max 150
All stock but to be like Buggy 1 with all koso cvt.
Roketa 150
Complete tear down building port/polished 61mm NCY head, 62mm cylinder, A12 Cam, 28mm carb, straight through exhaust, 8 pole stator, possibly 2.5 stroker, painting frame, adding plastic including doors and rzr seats.
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