400ex question

[Roudy]

Ok when a 400 is bored .60 over, whats that make the cc? I heard something like a 426?

[BLKrinnyrdr]

424

[Roudy]

Cool thanks rinny!

[Stuntmanmike]

.60 over will only increase your cc,s by no more than 2 to 3, Sorry. ???

[Roudy]

Ok so what makes a 440? What would it have to be bored to? Just curious ;D

[Buckeye]

stroke and bore will get you to 440.

[BLKrinnyrdr]

Seee, I knew I didnt know what I was talkin about ???

[Stuntmanmike]

To get 40 cc, you would have to add atleast 2mm to your stroke and 2mm to your bore. The most popular way is to get what is known as a big bore kit, which usually comes with a 4 to 6mm bigger piston.

[Roudy]

Ahhh i see...  ;D

[Stuntmanmike]

Just for an example my 660 rhino now has a 4mm extra stroke and 4mm over bore and it is only 720 cc. :)

[Roudy]

Ok, like i said before, still learning :) Extra Stroke? When a motor is "stroked", whats that mean?

[Stuntmanmike]

The rod that conects the piston to the crankshaft. It can be longer or change the location were it is connected to the crank. Basicly your adding volume or cc,s to internal size of your cylinder. More air and fuel means more Horse Power. ;)

[Mike_Wren]

Just make sure if you decide to do it, you match head with stroke so you dont have a piston slap...