XR650L high comp piston need decomp?

3 replies to this topic
  • Rover31

Posted July 06, 2005 - 01:43 PM


Hello all knowing engine gods.
Here is my question. I am building my XR650L up with the standard 10.25:1 comp piston.
We went to install the HotCam stage 2 (yes it says stage 2, I think it's a misprint, anyway) it does not have provisions for the auto decompression!
I know that some of you out there have done this. Have you noticed a strain on your starter? Is it hard to start? Would you do it again or go with a cam that allows for the auto decomp? Am I being lame?
So then I call the HotCam guys up and I get the "Uhhh I don't know, let me see if Jimmy knows.... Uhhhh he doesn't know either. Uhhhh I guess you shouldn't use it" So I wasn't very impressed with that.

So I thought oh well I will just get a White Bros. cam since it has that ability(auto decomp). Then I see that it is not in the catalog anymore and a phone call says it's not avail. After looking at the numbers more they have a very nice cam! Bummer.
Anyone have a solution. Should I cough up the big $$$ for the HRC? Is it any better than the others?


  • mountainrider

Posted July 07, 2005 - 03:13 AM


You will not need the decomp. My bike has 10000 miles on it since the rebuild and starts great.The Hotcams cam works great and it ups the RPMs to a whole new level.

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  • Rover31

Posted July 07, 2005 - 05:10 AM


That's great thanks!

Just to clarify you have the high compression piston?

  • mgs781

Posted July 07, 2005 - 12:32 PM


Yes he does. We both run similar setups. Wiesco 10.25:1 piston and Hotcams stage 1. I run the Edelbrock, Mountain has a non-pumper flatslide.


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