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yz426 carb on 450 question
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Posted by: atvracer9m

my quad had a 426 engine it and and now were are putting a yz450 engine in it what all should we change so this carb will work..

Posted by: ss440ex

The lower engine mounting holes on the yz450 set fearther to the rear....Aprox .200

The rest should be O.K.

Posted by: jrspawn

The headstay mount is also different than the 426. I also reccomend whenever swapping, buy the complete engine package, engine, carb and electronics. It will save you some time in the long run from trying to tune another carb to the engine.

Justin

Posted by: atvracer9m

sorry guys yea i ment will the carb work.. i think my dad has a yz450f edlebrock what do you think out these carb justin

Posted by: jrspawn

From what little exp. ive had with edlebrock, i would stay clear of using one. I would say skope ebay for a used 03 450 carb and you will be good to go. As for tuning, adjustability and ease/knowledge of working on, you can not go wrong with the OEM carbs for these engine. They are built to perform right with the engines. Im not a fan at all of aftermarket carbs like edlebrock or even worse(i wouldnt even call it a carb.) lectron

Justin

Posted by: atvracer9m

haha alright ill tell my pops .. so the 426 and 450 carb are not compadible.. haha ive had alot of problems with my lectron carbs on my old race quad

Posted by: 2muchquad

Yes the 426 and 450 carbs can be used on either engine.Use only minor fuel screw adjustments initially to establish a baseline.

Posted by: atvracer9m

what effect will the throttle position sensor have since its on a different engine

Posted by: 2muchquad

You dont even have to use it.On my 01 yz426 it doesnt affect how it runs if its plugged in or not....go figure

Posted by: atvracer9m

yea thats what my dad was told im just verifiing