420,425?

my 400ex was bored .080 over when i bought it. i want to bore it out again and get a big bore kit but i dont want to go up to 440. does anybody make a 420 or a 425 kit for a 400? where could i get one?

[Juggalo]

a 420 kit eh? i suppose you'd have to run an fmf powerbong head pipe to get the best gains from the 420 kit.

[400exJOE]

Juggelo is just messin with ya. I don't beieve there is such a thing as a 420 kit unless its an 87.5mm piston. You can get the 425 from a lot of people I'm sure. Its just an 88mm piston. Honestly, I am not sure you will feel very big gains out of that small a bore increase but I could be wrong. What are your current mods? If you don't have a cam or port and polish yet, thats what I recommend over a bigger bore.

[300EX-Man]

What is wrong with a 440, it is a great option in my mind. if you put a 420...425 or whatever, u will soon want more like a 440. i would say to get a 440, a cam, port/polish, valves, springs, rockers. it will rip

my friends is plenty reliable and fast

[Tommy 17]

guyz the 420 is a 416... yes u can get a 425 kit its a .120 bore or 88mm piston..