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BRAND NEW BIG BORE KIT, PUNCH OUT MORE POWER WITH A BIGGER AND BETTER PLATFORM FOR YOUR KIDS PW50! THIS KIT HAS EVERYTHING SHOWN TO REBUILD, INCLUDING A NEW 60CC CYLINDER, AND CYLINDER HEAD. THIS CYLINDER IS AN ACTUAL 60CC CYLINDER, AND THE HEAD IS DESIGNED FOR THE BIGGER PISTON, SO YOUR PISTON WON'T HIT THE HEAD, UNLIKE SOME OTHER SELLERS KITS. THIS IS NOT JUST AN OVERBOARD PW50 LIKE SOME OTHERS ON EBAY. OUR CYLINDERS ARE FACTORY CAST WITH BIGGER PORTS AND COOLING FINS FOR MUCH BETTER PERFORMANCE THEN OTHER UNITS. THIS KIT WILL WORK WITH YOUR OEM EXHAUST AND INTAKE.THERE ARE NO MODIFICATION NECESSARY, THIS KIT IS READY TO BOLT ON OUT OF THE BOX. QUALITY AND PERFORMANCE GUARANTEED! A CARBURETOR JET SIZE INCREASE IS RECOMMENDED, WE DO NOT SELL THE JETS AT THIS TIME! DON'T WASTE YOUR MONEY ON OTHER SELLERS INFERIOR PRODUCTS. OUR KIT IS THE ONLY ONE ON EBAY TO INCLUDE AN ACTUAL 60CC CYLINDER HEAD!! WITH A 50CC CYLINDER HEAD, YOU COULD RUN THE RISK OF DAMAGING YOUR PISTON IF IT DOES HIT THE HEAD, AS IT DOESN'T OFFER ENOUGH CLEARANCE. OUR KIT INCLUDES A BRAND NEW 60CC HEAD THAT HAS BEEN DESIGNED SPECIFICALLY FOR YOUR BIGGER BORE. BUY THE BEST QUALITY!!