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For those thinking about going bigger than 170cc on the GY6 will require you to bore your case to accept the larger cylinder. This tool can bore your GY6 up to 67mm. Also works on the Yamaha Zuma 125 engine up to 72mm. This tool elimantes send your case out to a machinist.
Engine bore tool by NCY. A must for using most large bore cylinder kits. IMPROVED DESIGN!! Now works with multiple engine designs!!!
GY6 MODELS: BORE UP TO 67MM.
Yamaha Zuma 125 BORES UP TO 72MM.