wise0co pistons royally suck any wise co piston i have ever ran in my quads has only lasted 2 moths at the most and made my quads vibrate like a tank i started running pro x and have not ever had a problem with them they are smooth running and reliable

 

Where do you buy pistons that AREN'T Wiseco? I need to top end my Banshee and all I can find is Wiseco. I need to go to .080 over.

 

Anytime a product does not work the way you are used to, it makes it seem bad. If you install a Wiseco just like the OEM piston before it, you can have problems. If you allow more tolerance, they are fine. With smaller bores, the difference is so little that it does not matter. Banshees have tiny pistons.

I can only get Wiseco pistons for most of my spare FL350 cylinders and they are especially tempormental. Honda debored it from 80mm to 78.5mm during a recall. Wiseco did not change the piston sizes they sell so a standard Wiseco is actually 1.5mm over and you can go up to 3.5mm over with a 2mm over Wiseco. Replacement sleeves are 80mm, so it is not possible to ever go back once past the Honda bores.

The service manual lists minimum tolerance at .004". The general Wiseco instruction sheet says .003" for an 80mm piston. It will seize the first time it is driven with either. One shop reccomends .005", run it on race fuel and jet a couple sizes over to keep it cool. I bore mine to .009", run it on 93 octane jetted for optimal performance and beat the living crap out of it. All kinds of people have told me I am running it too loose, but not after they have seen it run. It spins 9000 RPM and I have never cracked a skirt.

 

Pro-X

sam B.

My bike and Links
http://hometown.aol.com/quadspeed440...dzRockcom.html

 

I did fail to mention that over 8 orders they have sent me wrong circlips and 1 wrong wrist pin and a stock bore 11:1 400ex was undersized, making clearence .007 which did make some noise.

 

I don't think I would ever use one for a stock bore. I have never gotten two Wiseco pistons the same actual size as another of the same rated size. As their tooling wears, the pistons get slightly bigger. They probably figure as I do that it does not matter that much since you have to match the bore to the piston. I am actually on my third '80mm' piston in my the cylinder that is on my FL350 right now. The second was .002" larger than the first and the third another .006" larger than that.