WHY BORE YOUR OLD CYLINDER?????????? USE IT FOR A FISHING WEIGHT, OR A PIN/PENCIL HOLDER. WITH THIS KIT YOU WILL GET EVERYTHING IN THE PICTURE. CYLINDER - HONED AND READY TO GO-, PISTON,PISTON RINGS,PISTON PIN, PISTON PIN CLIPS AND A TOP END GASKET SET. JUST BOLT-ON AND GO. THIS KIT IS TO BE USED ON CT70'S THRU 1981, PASSPORT'S THRU 81 AND ALL XL70'S SL70'S. THIS CAN NOT BE USED WITH A 50CC HEAD. THIS CYLINDER IS 88CC'S, HOWEVER IT MAY SAY 49CC ON THE CASTING. ALSO WILL WORK ON ALL ATC AND TRX70'S 88CC_CYLINDER_KIT ALLOY_CYLINDER ATC70_ALL_YEARS CT70_TO_1981 ALL_SL_XL_TRX70'S 1-12/1-42/2-11$99.99 52MM_BORE (63MM/SHORT) ALLOY_CYLINDER (100012) FITS MOST ALL HONDA and CLONE 50'S AND 70'S overhead cam type engines 1968 THRU 2009 100012$56.99 52MM_PISTON_KIT (OLD_70_DOME) (SHORT_ROD) (SHORT_CYLINDER) (100042)WITH THIS PISTON YOU MUST USE OUR OLD_STYLE ULTRA_HEAD WITH_RACE_CAM (OLD_70_DOME) 25MM_INTAKE 22MM_EXHAUST OR A HEAD FROM A (CT70 1969 TO 81),(XL,SL,CL OR ATC70) MUST BE USED WITH THIS PISTON KIT!!!!!!!!!!! THIS WILL ONLY WORK IN OUR 52MM BIG CYLINDER STOCK HONDA CYLINDERS CAN NOT BE BORED OUT THIS BIG!!!! 52MM_PISTON_KIT (OLD_70_DOME) (SHORT_ROD) (SHORT_CYLINDER) (100042) 100042$39.99 TOP END GASKETS ** PICK BORE SIZE ** 39 47 51 52 MM tempTHIS KIT HAS EXTRA PARTS YOU WON'T USE,, THIS WAY IT WILL WORK FOR DIFFERENT MODELS. FYI STOCK 50'S = 39MM ALL Z50A Z50R XR50 CRF50 = 39MM ALL XR70 CRF70 = 47MM CT70 ALL = 47MM ATC70 ALL = 47MM C70 PASSPORTS ALL = 47MM C70M'S ALL = 47MM 85CC KITS = 51MM 88CC KITS = 52MM TRX90 = 47MM TRX90 103CC = 51 TRX90 106CC = 52 THIS WILL WORK FOR ALL YEARS OF 50'S 70'S AND TRX90'S PICK_BORE_SIZE SEE DROP BOX BY ORDER BUTTON 39MM_ 200008 47MM_ 200009 51MM_ 200010 52MM_ 200011 TOP END GASKETS ** PICK BORE SIZE ** 39 47 51 52 MM temp 200008 / 200009 / 200010 / 200011$13.99PICK_BORE_SIZE: 39MM_20000851MM_20001052MM_200011