what pistion to run?

7 replies to this topic
  • sweetk30

Posted August 09, 2006 - 07:05 PM


i want to bump the comp on my 93 xr650l. i see wisco 10.25:1 kit. and there is j.e. 10.5: 1 kit. what brand would you run? :thumbsup:

  • sl33py

Posted August 10, 2006 - 10:22 AM


a very reputable shop in my area that builds bikes says - it's all a grey area. He recommended getting the wisco and he could set the compression at whatever i wanted. I trust the wisco kit a bit more, but i don't know squat about j.e.

i am thinking of doing the same - what are you thinking - 670cc's?
102.4mm wiseco - 670cc'ish i think
103mm j.e. - 671cc (xrs only has them i think rebranded as theirs)

Let us know which you go with and how you like it.

going to do the big fin or oil cooler?


  • HawkGT

Posted August 10, 2006 - 10:36 AM


Wiseco and JE are both quality pistons. I slightly prefer JE but wouldn't hesitate to use a Wiseco.

  • creeky

Posted August 10, 2006 - 11:06 AM


I've used both, no problems with either.

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  • Agent J

Posted August 10, 2006 - 11:28 AM


which one is lighter? lighter = faster acceleration...in therory.

  • HawkGT

Posted August 10, 2006 - 01:14 PM


Also, the closer it is to the stock weight = fewer vibes....in theory.

  • zodran

Posted August 10, 2006 - 02:13 PM


My bike had a JE in it when i bought it, 102.4mm is supposed to be 675cc's. I have been running a wiseco for the last 10k or so. In comparison the JE had a couple of pockets milled under the "dome" and filled with what looked like epoxy to lighten it I assume. The JE also had valve relief pockets where the wiseco didn't.
The wrist pin fit much tighter in the JE. I believe I read that wiseco bought JE a few years ago. :thumbsup:

  • Wheels up

Posted August 10, 2006 - 03:19 PM


Wiseco here with no probs after 1500 miles. Great power to boot.

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