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Installing a '07 WR450 carb on a 426, what to do?


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44 replies to this topic
  • underground-mpyre

    TT Bronze Member

267 posts
Location: Indiana
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Posted December 28, 2014 - 08:51 AM


Installing a '07 Wr450 carb on my Wr426, I know I should turn out the full screw two full turns, what else like needle or anything I need to do before installing?

 

Plus, also going to install the auto-decomp Hotcam too while in the process. With the decomp cable going to be useless and of course disconnected, can I run the Hot-start cable to the now-useless decomp lever or do I need the WR450 hot-start lever? I am asking if the 426 decomp cable lever and the wr450 hot-start cable lever compatible?



  • Krannie McKranface
36,164 posts
Location: California
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Posted December 28, 2014 - 02:48 PM


You will need the hot start lever and cable

Copy the jetting from you YZ carb

Block off the ACV valve on the side of the carb by removing the plastic piston and putting a full gasket under the cover

Be sure to lightly coat the hot start plunger in Anti-sieze



  • underground-mpyre

    TT Bronze Member

267 posts
Location: Indiana
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Posted December 28, 2014 - 04:56 PM


You will need the hot start lever and cable

Copy the jetting from you YZ carb

Block off the ACV valve on the side of the carb by removing the plastic piston and putting a full gasket under the cover

Be sure to lightly coat the hot start plunger in Anti-sieze

I do not have a Yz carb, but a '07 WR450 carb. Do I need to raise or lower the jet needle?

 

i got the Wr450 cable for the Hot-start and would like to use it for easy trail starts. Getting a hot-start lever is no problem, but wondering if the 426 decomp lever was compatible.



  • Krannie McKranface
36,164 posts
Location: California
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Posted December 28, 2014 - 06:00 PM


Your 426 carb is a YZ  carb



  • underground-mpyre

    TT Bronze Member

267 posts
Location: Indiana
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Posted December 28, 2014 - 06:39 PM


Somehow there is a miscommunication: I own a 2002 Wr426 and updating it with a '07 Wr450 carb and asking what is there to do to prep the carb to the 426 before I install it.

 

Sorry, I am trying to be as clear as possible on what I asking.



  • Krannie McKranface
36,164 posts
Location: California
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Posted December 29, 2014 - 09:07 AM


Somehow there is a miscommunication: I own a 2002 Wr426 and updating it with a '07 Wr450 carb and asking what is there to do to prep the carb to the 426 before I install it.

 

Sorry, I am trying to be as clear as possible on what I asking.

 

Right, and your 2002 WR carb IS a YZ carb: no ACV port

Copy the jet sizes from your oldest carb, but use new parts.

Service the new carb with fresh rubber parts



  • underground-mpyre

    TT Bronze Member

267 posts
Location: Indiana
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Posted December 29, 2014 - 09:54 AM


Needle should be the same and with two full turns of the fuel?

 

Here is exactly what I am doing now:   http://supermotojunk...-all-Began-quot



  • Krannie McKranface
36,164 posts
Location: California
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Posted December 29, 2014 - 12:24 PM


You do not adjust the fuel screw by turns, you adjust it by idle speed. start with 1 turn out, adjust idle low as possible (hot motor) then raise it with FUEL SCREW. 

If it goes to high, lower it with idle screw.

 

Your accelerator pump should be re-built to 2008 specs

 

Read this

 

http://www.thumperta...ew-and-jetting/



  • underground-mpyre

    TT Bronze Member

267 posts
Location: Indiana
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Posted December 29, 2014 - 06:23 PM


Right, and your 2002 WR carb IS a YZ carb: no ACV port

Copy the jet sizes from your oldest carb, but use new parts.

Service the new carb with fresh rubber parts

Where can I find the right sizes at what website?



  • Krannie McKranface
36,164 posts
Location: California
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Posted December 29, 2014 - 06:33 PM


Where can I find the right sizes at what website?

 

Your service manual

Sudco.com

Jetsrus.com



  • underground-mpyre

    TT Bronze Member

267 posts
Location: Indiana
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Posted December 30, 2014 - 07:49 AM


Ah, thank you!



  • underground-mpyre

    TT Bronze Member

267 posts
Location: Indiana
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Posted February 05, 2015 - 12:35 PM


Ok Kah Ran Nee, is this the Tokyo spring I need for my accelarator pump to be rebuilt for $19.99 or do I need something else? I am purchasing what I can right now.

 

 

http://tokyomods.com...arburetion.html



  • Krannie McKranface
36,164 posts
Location: California
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Posted February 05, 2015 - 01:45 PM


That's it



  • underground-mpyre

    TT Bronze Member

267 posts
Location: Indiana
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Posted February 05, 2015 - 03:19 PM


That is all I need to replace is the spring in the pump?

 

How do I find a full gasket to block off the ACV valve next?



  • Krannie McKranface
36,164 posts
Location: California
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Posted February 05, 2015 - 06:20 PM


That is all I need to replace is the spring in the pump?

 

How do I find a full gasket to block off the ACV valve next?

 

It does not replace the spring in the pump, it replaces the apump linkage spring, not the diaphragm spring.

 

Use rubber, cardboard, anything. Then change a 100 air jet.



  • underground-mpyre

    TT Bronze Member

267 posts
Location: Indiana
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Posted March 13, 2015 - 07:01 AM


Ok, got most on order right now. Where exactly is the ACV valve? Is it under the plate on the left side of the carb?

  • Krannie McKranface
36,164 posts
Location: California
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Posted March 13, 2015 - 11:12 AM


acv_01.jpg



  • stevethe

    Get Help Now

5,214 posts
Location: California
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Posted March 13, 2015 - 11:21 AM


Make sure you plug the ACV well or it can be a headache. I epoxy mine shut so they look like a un drilled YZ carb.

  • underground-mpyre

    TT Bronze Member

267 posts
Location: Indiana
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Posted March 13, 2015 - 11:50 AM


Great, thanks! Yamaseal should work to block that off I think.

  • underground-mpyre

    TT Bronze Member

267 posts
Location: Indiana
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Posted September 26, 2016 - 06:53 AM


Acv valve is under this cover? Photo jpeg above isn't working. 1474901571961.jpg


Edited by underground-mpyre, September 26, 2016 - 07:37 AM.





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