HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
AlexJohncock

What exactly is required to use a YZ450F Carb on 426?

7 posts in this topic

Hi Guys,

I am in need of a new carb for my '02 426 and from everything I read it's just best to upgrade to a 450 carb. My question is what exactly I'll need to complete the swap aside from just the carb itself.

I have searched and read a bunch of different threads but none seem to give a good detailed description. When looking at pics of the 450 carb on ebay, it doesn't look like the adapter that goes from the carb air intake to the air box on the 426 will fit it. The one on the 426 has bolts on either side. It looks like this adapter does not exist for the 450's. The 450's look to me like they just go straight into the air box boot.

If anyone could clarify this for me with pictures and/or part numbers I would highly appreciate it.

Here is what I am talking about:

426 inlet side:

image007.jpg

450 inlet side:

f15db7cf136048bd89c759e34_thumb.jpg

450 intake boot which appears to mate directly to the carb UNLIKE the 426:

$(KGrHqV,!rEF!YbPm5hJBQLRbigY(g~~60_57.JPG

Thanks for your help!

Edited by AlexJohncock

Share this post


Link to post
Share on other sites

Take the old one off and put the new one on. It's literally almost that simple. The 450 carb does in fact drop right onto the bike, but there are a couple of details. It fits the carb mount and air boot perfectly, to start with. But you will need the throttle cables for a YZ450. These will fit nicely into your throttle tube, however.

Next, you'll need the complete hot start setup from a YZ450. That's the plunger, plunger seal, plunger spring, cable, cable guide, cable nut, cable guide cover, and a suitable handlebar lever. Using a complete stock YZ450 clutch lever /perch assembly or and aftermarket lever like an ASV with the hot start lever incorporated will simplify things.

In most cases, stock 450 jetting works very well to start with.

Share this post


Link to post
Share on other sites

Great, I bought an 05 450 carb today on Ebay with the throttle cables, hot start assembly and all. Thanks for your help!

Share this post


Link to post
Share on other sites

it's an 06 actually now that I check it. Does this upgrade actually help with power or just make the bike run smoother?

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0