64mm TB Basic Big Bore Kit for YX/GPX/Zongchen 150/155/160cc Engines tbw0473 This all adds up to

This all adds up to a cylinder head that puts out a

- Rear facing manifold kit

88cc Big Bore kit

but if you can replace your piston

64mm TB Basic Big Bore Kit for YX/GPX/Zongchen 150/155/160cc Engines tbw0473 This all adds up toTrail Bikes 170cc, 177cc, or 184cc Basic Big Bore Performance Kit for YX GPX Zongchen 150cc 155cc 160cc Engines Part Number: TBW9042 Description: All aluminum ceramic plated 64mm cylinder with skirt NEW We increased the skirt height and size on the lightweight high compression 64mm piston with rings, pin, & clips to increase reliability and service life (picture is not updated yet showing piston change) Head gasket kit includes the cylinder head o