Purchased a aftermarket exhaust for my rx1. Just wondering if it is necessary to change the jetting. Thanks in advance
Custom Rx1
Expert
- Joined
- Jan 16, 2007
- Messages
- 267
what pipe did you get and any other mods
Bamboozler
Newbie
See if you can contact the manufacturer of the pipe to see if they have any suggestions. They should be able to give you setup/jetting tips from what they found to work while testing. It would be in their best interests to do so.
How's it run, what do the plugs say?
How's it run, what do the plugs say?
it is an mpi exhaust, has dual k@n's with the outer wears, can't judge spark plugs because they are new and haven't gone riding yet
Bamboozler
Newbie
Thinking that with your filters you should be around 165-170 main jet, one needle clip position lower on the needle (enrichment), and #20 pilots based on what others are jetting for with the air box mod and or K&Ns. I would think that with the exhaust I'd try 170s to be on the safe side and do a plug chop to see what they are telling you.
www.jetsrus.com among other vendors has jets if you don't already have em. I do believe the P/Ns for the Mikuni pilot's are VM28/486 and the Mikuni mains are N102.221 small round, I'll be able to confirm soon enough. I just bought a set of 4 mains and 4 pilots from them (OEM, they worked fine on my bike), cost was $41.01 to my door for all 8 jets.
Edited to add: The jet P/Ns are listed for a Mikuni BSR37 carburetor (I will confirm they are correct once I have them installed
www.jetsrus.com among other vendors has jets if you don't already have em. I do believe the P/Ns for the Mikuni pilot's are VM28/486 and the Mikuni mains are N102.221 small round, I'll be able to confirm soon enough. I just bought a set of 4 mains and 4 pilots from them (OEM, they worked fine on my bike), cost was $41.01 to my door for all 8 jets.
Edited to add: The jet P/Ns are listed for a Mikuni BSR37 carburetor (I will confirm they are correct once I have them installed
you want 224.103 pilots No point looking at your spark plugs, maybe after 3000 miles of riding they might start to show something.
Bamboozler
Newbie
Thanks for the correction on the pilots, I've searched to the best of my abilities and only found the following link which never really confirmed if the VM28/486 where the pilots that came with these carbs.
http://www.ty4stroke.com/viewtopic.php?t=9378&highlight=vm28+486
Another confusing fact is that the VM28/486 and N224.103 pilots both have the same threads and screw in/seat the same. Which one came with the BSR37? Here's a thread that talks about such things.
http://www.thumpertalk.com/forum/archive/index.php/t-515214.html
I should have started a thread and ask, would have saved myself some shipping time.
Regarding the plugs, no color on the length of the porcelain inside the plug either?? I'm going to have to disagree, plugs can be read with little run time if you know what you are looking for.
http://www.ty4stroke.com/viewtopic.php?t=9378&highlight=vm28+486
Another confusing fact is that the VM28/486 and N224.103 pilots both have the same threads and screw in/seat the same. Which one came with the BSR37? Here's a thread that talks about such things.
http://www.thumpertalk.com/forum/archive/index.php/t-515214.html
I should have started a thread and ask, would have saved myself some shipping time.
Regarding the plugs, no color on the length of the porcelain inside the plug either?? I'm going to have to disagree, plugs can be read with little run time if you know what you are looking for.
sobfrogg
TY 4 Stroke Guru
A Wideband o2 gauge will git rid of all the guessing.
Bamboozler
Newbie
I agree (WB), but shouldn't be necessary to dial in K&Ns with an exhaust.
You can't tell the difference between 11.5:1 or 14:1 on a short plug burn on pump gas.
Bamboozler
Newbie
jd0270 said:
I agree with you, if ya want a specific A/F number get a wide band. To say that you can't read a new plug from a short tuning run that's too rich, too lean, showing signs of slight detonation, and or is spot on and happy isn't true. If you want to discuss PM me so we can stop trashing Nickrx1's thread.
