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
01bullitt

Motor options/swap in 2003 wr450....

8 posts in this topic

I just picked up a nj street legal wr450 that was locked up. Most likely going to need a crank jug and piston, but I was wondering if anyone has an info on direct drop in motors or one that will fit without a crazy amount of fabrication. For the price I paid it's worth using as a roller, I have an 02yz250 also and was curious if that might fit, or if anyone knows of any others that could fit, 2 or 4 stroke. Nj is hard to get street legal dirt bikes but there is no inspection so nobody will know what motor should or shouldn't be in it as long as the reg matches the vin and I have a plate on it. Thanks for any input.

Share this post


Link to post
Share on other sites

Anything else is not going to be a direct drop in. I would rebuild the WR engine, it's going to cost but likely cheaper in the long run versus a Frankenstein engine swap where nothing lines up.

Share this post


Link to post
Share on other sites

Anything else is not going to be a direct drop in. I would rebuild the WR engine, it's going to cost but likely cheaper in the long run versus a Frankenstein engine swap where nothing lines up.

only thing I would have an issue with is the bolt thru the swingarm and case. cr500 motor would be my first pick, but finding a motor is hard

Share this post


Link to post
Share on other sites

I'm all for dropping a CR500 motor in just about anything but I cant see what you would be gaining.

You would probley have to buy a complete old steelie CR500 just for the motor. A well set up, properly suspended old (96-01) steelie fame 500 will do everything better than your 03 WR conversion. Other than looking dated.

Your best bet is to just rebuild the motor ya got. Then you know exactly what you have when your all done.

Plus I don't think putting a smaller lighter 2 stroke engine in a 03 WR frame is going to make the bike handle any better. Which is the only thing about my 03 WR I've never been happy with.

Edited by adam500

Share this post


Link to post
Share on other sites

I'm all for dropping a CR500 motor in just about anything but I cant see what you would be gaining.

You would probley have to buy a complete old steelie CR500 just for the motor. A well set up, properly suspended old (96-01) steelie fame 500 will do everything better than your 03 WR conversion. Other than looking dated.

Your best bet is to just rebuild the motor ya got. Then you know exactly what you have when your all done.

Plus I don't think putting a smaller lighter 2 stroke engine in a 03 WR frame is going to make the bike handle any better. Which is the only thing about my 03 WR I've never been happy with.

My thoughts exactly. And if it's rebuilt properly, the WR engine is a reliable and low maintenance power plant.

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