[z440snopro]

I just rode my new sled for the first time yesterday and it melted a hole in the piston. I didnt know if the cylinder has been bored out or not. Does anyone know what the stock piston size is on a 2000 z440 sno pro? Thanks in advance!

 

[Sextion8]

The z440 has a different motor then the z440 Sno Pro and the pistons are different.
Fan or liquid? Both pistons can be found on EBay for like $70 and gasket kit for about $50, I think its got a 67mm bore so make sure you get the right bore cause some pistons are over bore so read before purchase.

 

[z440snopro]

It's the z440 fan. From what I understand the only difference between the z440 and the z440 sno pro is the suspension. I found a nice set of wiseco pistons for 150$ on eBay. It's just tough to find them in an oversized bore.

 

[COOKSTER]

Before you fix it you need to find what caused it to burn a hole in the piston or you will be fixing it again.
Wiseco pistons react to heat differently than other pistons specifically during engine warm up. Ive been told that if you dont let the engine get up to operating temp. before riding you can cold sieze the motor. Perhaps the experts can offer opinions and facts on Wiseco pistons?

 

[aduck]

yes if u dont let her warm fully up before take off u will cold seize with wisecos. as long as u can handle that theyre as good as bullet proof

 

[kccats]

Take the serial number to your local Stealer and he can tell you (or call Cat direct) Don't do Wiesco in a fan! Oem style pistons are like $50!