BEWARE of Pro-x Pistons (pics)

[Wayfast1500]

Sorry guys havnt been on the site for a while.  I ordered the piston based on year/size/model I almost never use part numbers.  It was ordered the same way the wiseco that was in before it was ordered.  All bottom end bearings have always been checked everytime I had the top end off (6-7 times in the 2 seasons I rode it) and there has never been any vibrations even up to rev limiter.  From what I've heard if the crank is off it will feel like riding a Jack hammer.  I've contacted pro-x and sent them pictures they just said tough luck.  I've spoke to Eric gorr and he's going to weld the cylinder/bore it/port it/deck the head/replate and include a gasket set and wiseco piston for $500 so I think I'll be going that route.  I feel a little better about the wiseco.  As for the guys that havnt had a issue with the pro-x I won't feel insulted if my pictures don't put the idea in the back of your head that maybe there's some quality control issues popping up. My bottom end was just replaced before I bought it (have the receipt) and I've worked under a factory tech and this top end was done by myself and a ex racer we have always checked it before assembly.  That wiseco is a good 1/8th shorter and it's just a forged OEM nothing special.  There's pics for proof but I won't be putting anymore pro-x pistons in any of my bikes.  I'm hoping no one else runs into this problem.

[coalpilot]

You didn't compair the new Pro-x to the Wisco BEFORE installing it? That is what I always do, compair the new part to the old to make sure they are the same befor putting it on the bike. If you had, you would have seen the difference and should have investigated further. Say like mabe ordering another Pro-x and seeing if it was the same or not, could be you just got a bad one. If it wasn't off by much, you could have ground down the skirt to match the length of the Wisco. IDK just saying. I've used both kinds and never had issues with either. My good friend who passed away 2yrs ago, was a kawasaki factory mechanic for over 30yrs, he absolutely hated wisco pistons and used pro-x exclusively. He was also a AA pro Trials racer/rider. He never had a job come back to him, so IMO, Pro-x must be doing something right. When I buy a new piston myself, I look to Pro-x first then wisco, then some of the other not so well knowns...usually buy whatever is on sale at the lowest price. Like I said, I've had good luck with both. I'd also check your cases for mismatch or damage.

[kaw rider]

did you check your piston to cylinder clearance and ring in gap. I would say your top ring in butted together then pushed out then snag on the port. Far as your skirt problem i would install that piston on there and see if there is any clearance problems at the crank bdc.