Group Buy - Honda 400cc +1mm pistons -

[racesupplies]

Not that good at maths mate,what do these work out at?

[ScottieDucati]

+2 are 428cc.

[jake]

Im not 100% with hondas mate, im a zxr fellow.
Your +1mm pistons i think are fine, as said they are allowed at the mgp now and bemsee. Other clubs will follow over the next couple of seasons i think, although as it stands still illegal in quite a few. Im guilty too tho, i have a +1mm motor.
I dont see the point of using +2mm pistons.
They will never be legal in f400, only in things like thundersportsgb. So thats why i say if you gonna go down that big bore option you might aswell go for the +3mm piston.Ive seen that gets you well into the 80hp on the dynojet with the v4's

[ScottieDucati]

+2's about as big as you can go on the Honda's, at least the V4's.... kinda along your logic... might as well go as big as you can!

[racesupplies]

Do you have to put liners in with those then?

[ScottieDucati]

So far as I understand, no... +2's the largest you can go with boring what's there.

[racesupplies]

I meant these bigger ones.How do you fit those.

[ScottieDucati]

Got me, never heard of anything bigger than a +2... as the guy said, he's a kawi guy... maybe in the CBR400's you can?? Not in the V4's so far as I know.

[racesupplies]

Dont know mate,he said why.

[jake]

sorry my mistake... told you im a zxr person!
I meant 433, not 440.
they are +2.5 the ones i meant....

but same difference