Stock 951 piston size?

[chrisamsdad]

Hello and can someone tell me what the stock size of a 1998 951 silver piston is ?
IE. 87.00 88.00 87.55

My motor has 87.91 is this stock? and if not how big can I bore the cylinder for cleaning some marks.

[John Kubiak]

Re: Stock 951 piston size?

Stock bore size is 88.0 mm, the piston must be smaller by at least 0.09 mm. And that's the size of your pistons, 87.91 mm!

[chrisamsdad]

Re: Stock 951 piston size?

Thank you, and what would be the next size up that I should bore to? 88.25?

The cylinders have some good ware marks so should I just have the holes rebored or should I just hone and replace stock.

[John Kubiak]

Re: Stock 951 piston size?

If they have visible wear, they need to be bored; however, you need to take them to someone locally to make the exact detemination for the proper size pistons/bore.

[seadoohx]

Re: Stock 951 piston size?

more than likely you could go to the only oem oversize which is 88.16 or so.
if not oem then you can get .25 .5 ect oversize thru sbt or wsm
I would go oem.

[John Kubiak]

Re: Stock 951 piston size?

88.16mm+0.09mm=88.25mm, the cylinder bore is .25mm oversize....


The pistons measure 87.91mm so, 87.91mm+0.25mm=88.16mm (1st and only OEM oversize)


SBT offers pistons in the follwing oversizes ,0.50mm, 1.0mm, and 1.50mm; that's 88.41mm, 88.91mm, and 89.41mm respectively! here's the link:


http://www.sbtontheweb.com/Merchant2...gory_Code=47-1