what piston is this?

[quadinfamily]

I have 250r that got a 75.5mm piston and i need another one , any help would be great thanks joe
http://i93.photobucket.com/albums/l79/quadinfamily/DSCF2367.jpg
http://i93.photobucket.com/albums/l79/quadinfamily/DSCF2366.jpg
http://i93.photobucket.com/albums/l79/quadinfamily/DSCF2365.jpg

[C-LEIGH RACING]

Is 75.50mm what the piston now measures ??

What you have in the pic is a part number W330PS, standard piston for the 330cc Pro-x cylinder.
New, that piston would have measured 75.95mm which would be a 76mm.
The next size piston is a part number W330P1, 76.50mm, but, before you order one, get the cylinder bore measured so you get the right size.
That piston is made by Wiseco but sold under the Pro-x name.
Dealers that sell them are LA Sleeve, CT Racing, Eddie Sanders Racing.
You can call LA Sleeve to find the nearest dealer to you at 1 800 822 6005.
Neil

[quadinfamily]

thanks ,the piston is 75.74mm and the cylinder bore is 75.95 on bottom 75.78 on top. i don't know how good my digital caliper from home depot is. thanks joe

[C-LEIGH RACING]

Are you measuring the piston just under the intake window from front to back, thats where the piston will be the largest.

To get a good measurement on the bore you need a T bar set & measure the bore just above the exhaust port & see what that is.
Neil

[quadinfamily]

thanks Neal, is this the right piston? And what is the piston clearance ? joe
http://www.lasleeve.cc/index.cfm?event=product.display&product_ID=2012

[C-LEIGH RACING]

Originally posted by quadinfamily
thanks Neal, is this the right piston? And what is the piston clearance ? joe
http://www.lasleeve.cc/index.cfm?event=product.display&product_ID=2012

According to the part number it is, but the pic & price is wrong.
Price should be 159.95 & that pic looks like a CR250R piston.
LA Sleeves has a new brand of piston they are retailing, a Wossner brand, with the molly coating on the sides just like in the pic. Unless they have changed machining on the Pro-x cylinder pistons, that one in the pics not one of them.
Neil

[Aceman]

I ordered a replacement piston for my 310 a few months back from LA Sleeve, it had the black teflon coating on it and was a pro-x.

[C-LEIGH RACING]

Originally posted by Aceman
I ordered a replacement piston for my 310 a few months back from LA Sleeve, it had the black teflon coating on it and was a pro-x.

Was it a cast or forged one.
It could be they have the Wossner pistons in that size, I surely hope so cause we need another design piston for these Pro-x cylinders.
Neil

[machwon]

I have a 73mm coated piston sent to me for a cylinder I'm doing and it is cast :(
I believe it came from CT but its in the usual white LA Sleeve box part number px845p4.