01 YZ426 stock carb and plug cap change


7 replies to this topic
  • david857

Posted December 09, 2005 - 06:46 PM

#1

I just got a 01 YZ426 and was just wondering if anyone knew what MM the stock carb was and was wondering if anybody had a rough guess of the jetting I will need to perform because I just ordered a FMF mid pipe and slip on Titanium. Also my plug cap went bad and have to install a new one and was wondering if that cap just unscrews from the wire. Thanks for any help guys you truely seem to be experts.

  • YZLEE

Posted December 10, 2005 - 03:33 PM

#2

I'm not sure about the jetting. But, I do know the plug wire simply pulls off. It's pretty hard to get off sometimes.

  • Hick

Posted December 11, 2005 - 01:04 AM

#3

I just got a 01 YZ426 and was just wondering if anyone knew what MM the stock carb was and was wondering if anybody had a rough guess of the jetting I will need to perform because I just ordered a FMF mid pipe and slip on Titanium.


Unlike some older thumpers and most 2 strokes, most modern MX 4-strokes won't need much jetting adjustment w/ the addition of your avg. aftermarket exhaust (provided the jetting was ballpark to begin w/).

You alter a lot more about the breathing characteristics of a two stroke by changing the expansion chamber shape, and a four stroke will need re-jetting if the breathing characteristics are altered greatly, like going from a WR or XR stock system to a closed-course competition system.




Bottom line is if the bike is jetted properly you'll likely only need a fuel screw adjustment.

Hope this helps.


Oh, forgot, your carb is a 39mm Keihin FCR. Stock jetting is 42 pilot, 162 main, EJP needle on 3rd clip, fuel screw at 1.75 turns out.

Pretty sure that is it, anyway....

  • david857

Posted December 11, 2005 - 05:25 AM

#4

your the f%ckin man thanks a lot. guess it would be nice if I had the manual but a clymer is on it's way!

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  • Satch0922

Posted December 11, 2005 - 06:12 AM

#5

you should do the coil on cap mod. It is clean , works and makes the carb and shock easier to get to (after you remove the old coil)

From user "Mike Dean"

"I sell a coil on plug kit, includes everything you need including a new coil, wiring, connecter, shrink tubing, convolute tubing, and simple instructions. $45

Mike Dean
www.mikedean426@excite.com
608-576-8745

(notice the coil is removed from the frame.....)
Posted Image

  • bustersat

Posted January 04, 2008 - 09:38 PM

#6

Anybody know if these kits are still available? Where can I get one? I can find the coils just not the plug. Thanks!

  • grayracer513

Posted January 04, 2008 - 10:07 PM

#7

GM sells replacement connectors and terminals for their stuff, and the connectors on Yamahas look similar to those used in Japanese cars. You might be able to match something up at a dealer.

A lot of people used to use the over plug coils from a Suzuki Haybusa, and I believe that the connector was available as a repair part. Do some searching here. You should be able to find something.

  • bustersat

Posted January 04, 2008 - 10:18 PM

#8

Thanks gray! I will be looking!





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