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Auto Decompression exhaust cam???



20 replies to this topic
  • steve lemley

    TT Silver Member

545 posts
Location: California

Posted January 20, 2006 - 07:35 AM


I have heard rumors of this exhaust cam that auto decompresses during kick starting to allow you to start your bike like a 2 stroke. The problem is that I don't know the name of it so I can't search old forums. Could some just give me the name of it so I can search. Maybe a testomonial or two if someone is using it would be nive also. :thumbsup: :bonk: :thumbsup: :eek: Thanks again guys!!!

  • kbryant3399

    TT Member

97 posts
Location: Idaho

Posted January 20, 2006 - 09:00 AM


do a search on "Autodecompression cam", "hotcams" or YZ450 cam. Hotcams website sells them for any bike so search that site as well. www.hotcams.com

  • byggd

    TT Titanium Member

2,923 posts
Location: California

Posted January 20, 2006 - 02:16 PM


What year bike do you have? If it's a 2000-2002 WR or YZ 400 or 426 you can use these instructions and it even gives you the Yamaha part number. I converted my 02 wr426 and it's the second best mod I have have done next to the Rekluse clutch :thumbsup:
http://photobucket.c...0cam_Page_1.jpg

  • 642MX

    Get Help Now

7,132 posts
Location: Indiana

Posted January 20, 2006 - 09:00 PM


The auto decompression cam is awesome. Its well worth doing, don't forget to order a decompression plug from the TT store.

  • bigdrtrdr

    TT Gold Member

1,496 posts
Location: Washington

Posted January 20, 2006 - 09:49 PM


I kept the manual decomp lever and junk, Sometimes ya gotta clean it out.

  • byggd

    TT Titanium Member

2,923 posts
Location: California

Posted January 21, 2006 - 05:47 AM


I kept the manual decomp lever and junk, Sometimes ya gotta clean it out.

I took mine off. To clean it out all you do is pull the hot start, hold the throttle open and the kill button down and kick it over a few times :thumbsup:

  • bigdrtrdr

    TT Gold Member

1,496 posts
Location: Washington

Posted January 21, 2006 - 08:19 AM


Thanks, Bygdd I'll strip it off as soon as I get the plug kit.

  • CAVSCOUT96

    TT Bronze Member

490 posts
Location: Kentucky

Posted January 21, 2006 - 08:39 AM


What year bike do you have? If it's a 2000-2002 WR or YZ 400 or 426 you can use these instructions and it even gives you the Yamaha part number. I converted my 02 wr426 and it's the second best mod I have have done next to the Rekluse clutch :thumbsup:
http://photobucket.c...0cam_Page_1.jpg



I have a '99 WR. Will it work on mine too?

  • nimiz1

    TT Bronze Member

316 posts
Location: Israel

Posted January 21, 2006 - 09:20 AM


can i replace only the exhaust cam to the yz-450 , do i need anything alse
i have a 1998 wr-400.

  • byggd

    TT Titanium Member

2,923 posts
Location: California

Posted January 21, 2006 - 09:31 AM


I have a '99 WR. Will it work on mine too?



can i replace only the exhaust cam to the yz-450 , do i need anything alse



I don't know if the mod was ever tested on pre 2000 bikes :thumbsup: maybe someone else will know :bonk:

As far as anything else needed, all I need were some new shims.

  • 642MX

    Get Help Now

7,132 posts
Location: Indiana

Posted January 21, 2006 - 01:10 PM


I don't know if the mod was ever tested on pre 2000 bikes :thumbsup: maybe someone else will know :bonk:

As far as anything else needed, all I need were some new shims.




It will work on the 400's also.

  • CAVSCOUT96

    TT Bronze Member

490 posts
Location: Kentucky

Posted January 21, 2006 - 02:36 PM


This is gonna be my next mod. It's bound to save me some energy when I crash during harescrambles!!

  • JMathis

    TT Bronze Member

214 posts
Location: Ohio

Posted January 21, 2006 - 06:47 PM


You will be amazed at how much time and energy it will save you durring an HS. I have not done the auto clutch yet so this was certainly the best mod that I have done. Plan on getting some larger shims.

  • CAVSCOUT96

    TT Bronze Member

490 posts
Location: Kentucky

Posted January 21, 2006 - 07:21 PM


I think I'm gonna try to get the mechanics at my local shop to walk me through it. They're starting a new D10 HS series here in KY and I'm gonna try to get them to help me out on parts and teaching me some wrenching!

  • steve lemley

    TT Silver Member

545 posts
Location: California

Posted January 24, 2006 - 09:06 AM


Anyone got one of these auto decompreesion cams that will work for my 99 wr400 for sale??? If so email me with a price. Thanks stevelemley@sbcglobal.net

  • byggd

    TT Titanium Member

2,923 posts
Location: California

Posted January 24, 2006 - 12:11 PM


I got mine from the TT store OE parts. It was less than $120 delivered and the dealer wanted almost $160 :thumbsup:

  • Dieselbeast90

    TT Member

28 posts
Location: Oregon

Posted January 14, 2017 - 03:45 PM


What are people using to block off the decomp stuff coming out of the motor?. Is there a special plug?.

  • zibbit u2

    TT Bronze Member

412 posts
Location: British Columbia

Posted January 16, 2017 - 01:20 PM


What are people using to block off the decomp stuff coming out of the motor?. Is there a special plug?.

 

 

Yes there is a special plug.. Search "Decompression Plug" and your make model.  I couldn't find the TT Store variant, but there's lots available out there.



  • Dieselbeast90

    TT Member

28 posts
Location: Oregon

Posted January 16, 2017 - 03:03 PM


Ok thanks.

  • Dieselbeast90

    TT Member

28 posts
Location: Oregon

Posted January 16, 2017 - 03:15 PM


I'm not finding anything for the 400. Would it be the same one as the 450?.




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