bigger than a 440?

[motoboy66]

I was looking on the XR Only website when I noticed that Wisco is making 2 pistons bigger than the 89mm. I am not too sure but I thought the piston in the 440 kit was 89mm. The two sizes they have are 89.25mm and 89.5mm. If this is the case can u boar out the 440 kit if you really needed to? Just a thought.

[Nausty]

yes they go to 465 but you have to have a differant sleeve. I think they might ever go bigger.

[d-14 rider 27]

i dont think you can bore it to 465, a 440, with a stroker crank is 465. and i think 89mm is 435cc, they might be making true 440 pistons.

[Nausty]

i'm positive they make 465 strait bores atleast the dirt only one is and I think tc racing makes em' that way.

[d-14 rider 27]

i got to thinkin about that today, they must make a bore quite a bit bigger than 440, because how else would mickey one-lap build them to 500cc?, im pretty sure they dont stroke any farther than 4mm tho, your piston skirts would have to get pretty small to clear the cheeks on the crank,

[Stroker Ace]

A couple of builders that I know of stroke out to 7mm with great reliability.

[d-14 rider 27]

i didnt think they could go that far, you wouldnt have any piston left by the time you shaved it down to clear the crank. maybe it is longer than 4mm, i dunno, mines from powroll.