| is the big bore kit and head upgrade kit the same thing??
r they the same this because i found this head upgrade kit of ebay and wont 2 no if its any good
High Performance, Complete Head kit to suit Aircooled Pocket bike
ROUND DOME STYLE COMBUSTION CHAMBER
NEW BILLET HEAD DESIGN WITH REPLACEMENT BILLET CAPS
EXHAUST PORTING
BARREL HAS AN EXTRA BOOST PORT MACHINED INTO IT
PISTON HAS A SPECIAL WINDOW PORT
15:1 COMPRESSION RATIO
!!!50.177cc!!!
Includes:
2 piece billet alloy cylinder head and chrome dome
44mm cylinder head
Full Circle Crank
1 pcs copper gasket/ FULL gasket set
4 pcs bolt
1 pcs Performance Piston with piston rings, pin, clips, bearings
1 pcs spark plug
let me no if its any good | 
