Is a 420 bore even possible

[kineo3]

A friend of mine says he just got his 400ex motor built and the builder bored it to a 420. I think that he is full of S***. I have never heard of this size. Am I just misinformed, or is my buddy an idiot?

[Silverfox@C&DRacing]

There is 406,416,426,440 and up from there, if I remember there is a 435 bore also.

[Juggalo]

theres a 420 bore. in fact i am just about to buy a 420cc motor from a guy. silverfox you left out 425 too.

[Silverfox@C&DRacing]

I did mention it same as the 426/425 :D

[TRXMaddness]

There is a 435 bore which is about the same as the 440 bore.