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.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • 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.

Related Content


DirttyPig 2005 Xr650l Prroject! by braapmebb1moretime

Dirt Bike   Make / Model Specific   Honda   XR600/650
  • 22 replies

Cle Elum Sunday 5/29: Looking for dual sport tips by TigerTanker

Dirt Bike   Dirt Bike Regional Discussion   Northwest
  • Hot  32 replies
Want to add a kickstart to your XR650L?  Here's how - last post by clc3251

Want to add a kickstart to your XR650L? Here's how

  • 1 reply

XR650L super moto wheels by greggkklee

Dirt Bike   Make / Model Specific   Honda   XR600/650
  • Hot  29 replies

93 xr650l Restoration Project by Zigster

Dirt Bike   Make / Model Specific   Honda   XR600/650
  • 17 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.