Yes the [color=#b22222]([/color][color=#b22222]Quad carb off a 2005 YZF450[/color][color=#b22222])[/color] works on my 2000 YZ426.
[color=#006400]Pro's[/color] it much cheeper than using a carb off a YZ450F I found there about half the price on Flee Bay easy to find at less cash out of pocket it now untill others figure this out.
[color=#ff0000]Con's[/color] you have to drill tap threads the carb body where the return Throttle cable go's to make it work You dont have to have a return thottle cable if you dont want one thats up to you.
No mather which way you go with a [color=#0000cd]YZ450F this more plug and play no drilling and tapping threads there already there for the return throttle cable, there should be no jetting changes[/color] ([color=#000080]Drit Bike[/color]), [color=#b22222]YZF450[/color] ([color=#b22222]Quad[/color]), you need to buy new throttle cables for anyone of these set up to work Like I said you can buy a single type throttle cable and throttle system if you want so you dont have to drill and tap the carb body or just hook 1 of the dual cable ( Pull / Pull cables) system up and tie up the other one you not using out of the way.
I had a bike stick wide open on me when travling at very high rates of speed this with a single throtttle cable system bike it bad news I like the pulll / pull throttle system you can force the carb shut and get the bike slowed down and stopped.
Oh ya I didn't crash the bike that was stuck Wide open I just reached down and shut the gas to off hung on until it ran out of gas (Dont panic slow is fast think thing about what you need to do next).
I swapped the Main and Pilot jets from the Stock 426 carb to the 450 carb put the Needle on the YZF450 carb to the 2nd slot.
I used my hot start lever frrom my 426 carb BUT I had to buy a Hot start cable off a 2005 YZF 450 for things to work and had to trim the cable tube comming out of the carb so every things works it is put on the bike and keep on trimming the tube utill you are sure the hot start plunger bottoms out when the lever on the bars is released ask me how I found this out.
If you dont get the Hot start to work right the bike will run but it will not rev out it be running lean.
I had to trim intake boot rubber on the OD from the carb to the motor the Hose clamp is clocked you have to shave off the indexing rubber tab so you can rotate clocking of the clamp upside down so you can get to the clamp screw and if you try to keep the clamp right side up the screw will hit the carb.
The Idle adjustment is where the TPS is comming out of the carb it Nice easy to get at.
As for the TPS there is 2 plugs comming out of it 1st is for the TPS the other for the adj the idle speed you dont need this one tape up the end and tie up to the frame of the bike.
Good luck not hard to do just take you'r time it cost you much less going this route than the carb off a YZ450F.
Edited by marv02, August 26, 2012 - 09:03 AM.