piston,pro X

[bick]

JUST HAD MY TOPEND DONE, AND IT HAS PRO X PISTONS. HAS ANYONE HEARD OF THESE? ARE THEY GOOD. I THOUGHT THEY WEE GONNA PUT PROLITES IN.

[DIRTBIKEZ]

Did you try searching? Try HERE you may find what you're looking/not looking for.

Edited October 23, 2004 by DIRTBIKEZ

[locogato11283]

we put some in my brothers old banshee. they seemed to wear out quickly. or at least the rings maybe.

[Tim C]

I think Duncan Racing uses them so they must be pretty good

[tats4life]

I think Duncan Racing uses them so they must be pretty good

they do and they SUCK.......there known for siezing....get wiesco's.

[locogato11283]

I think Duncan Racing uses them so they must be pretty good

they do and they SUCK.......there known for siezing....get wiesco's.

yep. my bro sold his to this guy and it locked up.

[MotulMonsta]

I bought a set of pro-x..They suck. They are cast aluminum..they are heavy and make a lot of noise. They wear out the rings too fast, excessive piston slap. All around bad pistons. They take longer to warm up too. Pretty much a direct replacement for stock.

[RNBRAD]

If your seizing cast pistons your definitely going to seize a forged one. If I was to try and sum up cast versus forged, it depends on whether you want to change pistons more often or rebore your cylinders more frequently. http://www.motorcycleproject.com/motorcycl...ws-pistons.html Check this article out, it covers a lot of benefits and disadvantages of both. I've ran PRO-X pistons for a while with no trouble whatsoever, but they went in a perfect bore, installed correctly and broken in properly with proper jetting. You can't always blame your pistons for a short life.

[fixitrod]

Here's the summary from that page. Good page by the way.

 

Summary

To sum up, the cast piston is light and very dimensionally stable. It is found in high-rpm mass-produced engines that are not subject to modification or prone to detonation. The piston is however fairly brittle, and the cost of its manufacture has limited its availablity outside the OEM sources and applications. On the other hand, the forged piston is inherently heavy and less dimensionally stable. It is a good choice for engines in which detonation is probable, and its wide availability has made it the choice of engine modifiers. The special demands of these end users has given the forged piston its own niche in the powersports market. The next time someone tells you how superior one piston type is over another, tell them the truth. Because, as Paul Harvey likes to say, "Now you know the rest of the story." Hold the fries, please.