Hello All,

I have a 2009 S40.  I would like to either modify my existing muffler or change it out with something that has more volume.  I also have noticeable 'hesitations' while riding.  I've been told I need to re-jet and swap out for a K&N air filter to compensate for the change in muffler and to get rid of the hesitations.  I bought a Re-jet kit from DynoJet but apparently that was not what I needed.  

I guess I need 150 and 51 or 51.5.  I'm not a mechanic so I'm parroting what someone else told me.

Anyone know where I can get the correct jets?

Thanks!

SianLogic

I like JetsRus because they have a good lookup utility (by carb or bike).  And the jets are cheap enough that you can try several, and only pay for shipping once.  

I forgot what jetting was good for the K&N + Dyna muffler, but in general, it is mostly the main jet that needs to change.  To start with, try increasing the pilot jet one size and the main 2-3 sizes, and do the white spacer mod.  That should get you in the ballpark.. then fine tune it with the extra main jets you bought, and the mixture screw.