Mini Dirt Bike High Performance Head KitClick to enlarge Mini Dirt Bike High Performance Head Kit. Convert any 47cc or 49cc engine with this complete upgrade kit. Beautiful 2 piece chrome head, brass head gasket, ported barrel, ported piston, 2 new piston rings, new crank, 2 new piston circlips, new small end bearing, new wrist pin, and new NGK spark plug, and base gasket. Awesome power gains, compression goes throught the roof. Revs at approximatley 3000 RPM higher than standard engine. Lovely smooth running with a really fruity Full-On sports sound! THE BEST MOD FOR ANY MINI MOTO POCKET BIKE WE HAVE FOUND SO FAR! THROUGHLY RECOMMENDED! NOW WITH FREE FULL CIRCLE CRANK!! £49.99 SpecificationsProduct Code: Mini Dirt Bike High Performance Head KitManufacturer: FunBikesProduct Weight: 0Stock Quantity - 10