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Engine size?
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Posted by: bruteman

I recently traded for a 400ex that has a aftermarket sleeve and supposedly the biggest piston you can get for it, is there any way to guess the displacement without actually taking the engine apart. Any "guess" would be greatly appreciated, just curious it has a stage two hotcam and it runs really strong-thanks

Posted by: REDRIDDER

MOST COMMON I WOULD SAY IS THE 440 KIT.

Posted by: Brauap

Yea, most likely a 440, but the biggest is, what, a 505? But I doubt its the biggest.

Posted by: blue_ex_rider

Sparks has a pistion alone that makes it a 465 without a stroked crank. But my guess is that its a 440 that is the most commonly biggest pistion used.