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
aze

what to do to improve......wr 450

11 posts in this topic

I ordered a WR450F for endurance beachracing.

I did that because of the benefits in cooling capacity, gearbox, e-start,bigger fuel tank.

My suspension got to be revalved/new springs anyway.

My question now is how to get my engine at the YZ450F level???

Are there any dyno results available of a standard/prepared WR?

Wich are the major differences between wr and yz engine?

Cams?

Exhaust?

What with the jetting specifications?

Airfilterbox?

A lot of questions, i know, but after reading a few posts here i become to be afraid that i made the wrong decision on how easy it was to transform wr into yz horsepower! !!

HELP!!!

Share this post


Link to post
Share on other sites

Indy, i did, and i find a few things, but still confused about cams and jetting.

What is the exact difference between yz and wr exhaust cam?

Are the inlet cams the same?

What are the differences in jetting?

When i use a motocross pipe do i have to change the airfilter more than just remove the snorkel and baffle?

thanks!!

Share this post


Link to post
Share on other sites

Hi Aze,

The following mods are pretty easy:

Air box snorkel removed.

Replace the muffler with one of your choice for noise since the European corks are welded on.

Rejet your carb with a standard YZ needle and appropriate jets. This part can be confusing since there are a lot of jets but you can ask racers in your area what jetting they are running. Get a Zip-Ty fuel mixture screw. Dont worry about YZ timing. Ride and have fun!

Share this post


Link to post
Share on other sites

That exhaust system looks good. If you want more peak horsepower and you are going to buy this system you will need the YZ450 exhaust cam. It should give you 5 extra hp with the cam. You will loose some bottom end but not to bad. Let us know how it goes.

Share this post


Link to post
Share on other sites

Indy,the exhaust system arrived today!!

For the long straits in beachracing i need maximum peakpower, so the exhaust cam is on my order book.

Now waiting for the the bike to arrive.

This is usefull info, thank you!!

Share this post


Link to post
Share on other sites

Pick up this months motocrossaction mag. It has a real good article in converting the WR to a YZ spec mx bike. Keeping in mind you want the lights and all as a wr the engine mods and setup may help you out here.

Share this post


Link to post
Share on other sites

Thanks ego.

We dont have mxa over here before next week.

Then i'm gonna buy it.

Is the article worth the money???

grtz

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