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Honda MX & Off-Road Dirt Bikes
CR250 2002 Top End questions- OEM or Weisco?
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[QUOTE="Micahdawg, post: 896371, member: 21668"] I've heard two conflicting views throughout this thread. One person says the Wiseco piston feels lighter than OEM...one person says the OEM piston is lighter than Wiseco. Here is what I've been told and makes sense. When I was deciding which piston to go with on my older 97 RM250, the sales guy (a friend) told me this. The wiseco is forged (stronger) than the stock cast piston. So the wiseco can get away with being thinner and lighter. (KTM is the only manufacturer to use forged pistons for stock applications.) The stock cast pistons are normally thicker and heavier to beef them up. So from a performance standpoint, the thinner wiseco would probably be the choice. A wiseco kit is almost always going to be cheaper than OEM also. So I went with Wiseco. As far as long term durability...it sounds like both will last quite a while. But as for abuse (detonation, fire spiking)...I would rather have a thinner forged piston than a thicker cast one. Forged pistons should be able to deform, melt...and do all kinds of screw stuff while a cast one will probably just get a hole blown through it. At least this seems to be the case in my experience with car engines. I think wiseco is also thicker/beefier in the pin area than stock. So for me...I'll probably stick with Wiseco, but if I got a killer deal on OEM I wouldn't turn it down. Micah [/QUOTE]
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Honda MX & Off-Road Dirt Bikes
CR250 2002 Top End questions- OEM or Weisco?
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