A big bore kit is essentially a new cylinder and piston. most CAG motors have a 40mm piston and cylinder. A big bore kit upgrades the piston and cylinder's size to 44mm. In addition, the big bore kit has additional ports in the cyl., and sometimes even a windowed piston. There are 3, 4 and 5 ported cylinders, that come in either 1 or 2 pieces. What a big bore kit is meant to do is firstly upgrade the engines displacement (ever so slightly) and secondly increase the compression, thus more torque/power/throttle response.
installing the kit is relatively simple, making it work properly is another thing. Since all these parts are mostly all china made, their quality is questionable. Before installation, a lot of re-machining, sanding, deburring and polishing will be necessary if you want to feel real power gains. What this means is that you need to have some knowledge of working with metal, and also the tools to do so.
they can be found on ebay, or any of the online parts stores listed in the forums.
installing the kit is relatively simple, making it work properly is another thing. Since all these parts are mostly all china made, their quality is questionable. Before installation, a lot of re-machining, sanding, deburring and polishing will be necessary if you want to feel real power gains. What this means is that you need to have some knowledge of working with metal, and also the tools to do so.
they can be found on ebay, or any of the online parts stores listed in the forums.
