50mm HONDA DIO-SR BIG BORE CYLINDER KIT. KIT INCLUDES CYLINDER, PISTON, RINGS, PISTON PIN, CIR CLIPS, HEAD GASKET, BASE GASKET AND EXHAUST GASKET. WHEN YOU USE THIS SSP-G 50mm BIG BORE CYLINDER SET IN CONJUNCTION WITH YOUR STOCK 41.4mm CRANKSHAFT YOU WILL INCREASE YOUR TOTAL DISPLACEMENT TO 81.3cc FITS HONDA ELITE S/SE/SR AF16 MODELS FROM 1994-2001, KYMCO ZX50/FEVER/DD50, DAELIM CORDI 50 AND SYM DD50. NOT FOR EARLIER MODEL HONDA AF05E ENGINES.PLEASE SEE OUR WARRANTY & RETURNS POLICY. *YOU MAY NEED TO MODIFY YOUR ENGINE CASE TO ACCOMMODATE THE LARGER CYLINDER. UPGRADES TO 81.3ccCYLINDER BORE: 50mmCYLINDER SLEEVE OUTER DIAMETER: 54.2mm WRIST PIN DIAMETER: 12mmTOTAL PISTON HEIGHT: 56mmCOMPRESSION HEIGHT (FROM CENTER OF WRIST PIN HOLE TO TOP EDGE OF PISTON): 31.5mm *PLEASE READ ALL BELOW* SHIPPING ALL PARTS ARE SHIPPED WITH EVERYTHING LISTED. RETURNS THERE ARE ABSOUTELY NO RETURNS ON ALL OF OUR RACING PARTS. ONCE YOU PURCHASE ANY RACING PARTS FROM US THEN THEY ARE YOURS. WARRANTY THERE IS NO WARRANTY ON ANY RACING PARTS. THIS PART SHOULD BE INSTALLED BY A PROFESSIONAL MECHANIC.SHIPS FROM SHELBY, NC M1