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
npfman

WR426F Jetting

5 posts in this topic

Hi peeps, 1st time poster, long time lurker here :)

I have a 2003 WR426F in supermoto Trim, bought it last november having lots of fun with it, also take it green laning as well, when i can be arsed to change the wheels over.

Anyhoo, took it to my local Dyno today, got good power run 49 Bhp.

Ive attached the printout with the air/fuel ratio, the Dyno Technician reccomends that when the bike is going towards the top of the rev range that it needs to be within the 13 mark, mine is running a little lean in the 14 mark, he reccomended that i go up one stage on my main jet.

Ive taken the main jet out and what looks to be written on it is a K sort of shape and 165S, ive also attached what i found.

Just wondering if anyone can tell me which is the next Jet up and where can i get them from? Im in the UK

Thanks

Nick

scan0001.jpg

scan0002.jpg

Share this post


Link to post
Share on other sites

Is the 03 a 426 over the pond? Should be a 01-02 with the 450 being born in 03?

Share this post


Link to post
Share on other sites
Is the 03 a 426 over the pond? Should be a 01-02 with the 450 being born in 03?

Registered from New on a 2003 Plate, could be a 2002 though, just registered late?, Im new to Yams :)

Share this post


Link to post
Share on other sites

The K apparently means its a Kiehin Jet

Going to order a 168 and a 170 Main jet, that sound about right?

Cheers

Sorry about saying it was a 2003 WR, it was only registered in 2003 :)

Share this post


Link to post
Share on other sites

Yep, 170 would be your next step up. I suggest getting a 175 too in case the 170 doesn't do the trick. Cheap investment!

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