400ex big bore

[Built_300EX]

I was wondering, what all sizes do the big bores for the 400ex come in?

406
416
426
440
Something like that? I'm just wanting something reliable but has power so I was thinking about going with a smaller bore size and was also wondering where to get the sleeves and such for the kits? Smaller preferably.

[CJM]

Smaller bore size would mean less power, you want bigger bore size.

I think 416 is a good size, more power (400ex engine is actually 397cc so thats up almost 20cc). It also doesnt have the overheating issues the larger engine bores do.

If you just want more power with no real fuss a sparks timing key might be the ticket too. More power, very cheap and easy to install.

[foreman 450]

Will the 416 kit with the 11:1 piston cause any problem as to using the kit with the 10:1 piston in it?

[foreman 450]

Will the 416 kit with the 11:1 piston cause any problem as to using the kit with the 10:1 piston in it?