• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Two pilot jets - rejetting

  • Thread starter Thread starter 11csive
  • Start date Start date
1

11csive

Guest
I'm in need of a little bit of advice and help here.

I'm in the middle of rebuilding my GS550D. The exhaust fitted on it when I bought it was completely rusty and therefore I had to change it. I ended up buying a 4-1 MAC (with silencer). So I'm in for a re-jetting and a lot of fun pulling plugs and so on. So currently I'm looking to buy new jets. I'm looking to go up a couple of sizes on the main jet and perhaps (might not be needed) up a notch on the pilot jet. And this is where I ran into problems. My 550 comes with VM22ss carbs which are equipped with two pilot jets inline (#15 and #50). Question is, say I need to go up a size on the pilot jet. Would I just go up one size on both of my pilot jets? Or what is the correct way to approach this? I haven't been able to find any information considering this matter.

Hope that some of you clever folks on here got an answer for this ;)
 
Pilot jet #1 (#15) is the one you should be concerned with. I'm not even sure what pilot jet #2 even is.
 
Nessism said:
Pilot jet #1 (#15) is the one you should be concerned with. I'm not even sure what pilot jet #2 even is.
Click to expand...

They look like this:

3wKUjCu.jpg

T3gobbD.jpg


They are placed on top/underneath each other and in the same place as the normal pilot jet is placed on all the guides and diagrams I've seen of VM carbs :)
 
Last edited:
You shouldn't need to do anything with the pilot jet just to change pipes. Just get the main right, and the needle clip.
 
tkent02 said:
You shouldn't need to do anything with the pilot jet just to change pipes. Just get the main right, and the needle clip.
Click to expand...

I'm aware that it's probably not gonna be needed, but now I'm curious as to which one I'd have to swap if it some day was needed :) So it would only be the "long" one that should be changed out?

edit: seems like jetsrus call it a "mid jet"
 
Last edited:
I rebuilt a set of those VM22's but completely forgot about that second pilot jet. Most other VM carbs don't even have them. Again, I'm pretty sure you don't need to worry about the second jet, just bump the 15 to 17.5 if you want to see if that makes a positive improvement in the way the bike runs. Dennis Kirk sells original Mikuni jets for good prices. Be sure to order the VM type with the bleeder. I think I've got some of those 17.5's is the spares box somewhere even.
 
Nessism said:
I rebuilt a set of those VM22's but completely forgot about that second pilot jet. Most other VM carbs don't even have them. Again, I'm pretty sure you don't need to worry about the second jet, just bump the 15 to 17.5 if you want to see if that makes a positive improvement in the way the bike runs. Dennis Kirk sells original Mikuni jets for good prices. Be sure to order the VM type with the bleeder. I think I've got some of those 17.5's is the spares box somewhere even.
Click to expand...

Thanks a lot for you answer. For now I'm probably just sticking with the 15, but it's good to know what to do, if I find it necessary to change into 17.5 :)
 
Really, you shouldn't ever have to enlarge the 15 jets. :-k

The only time you need to add more fuel is when you have more air. Mains are enlarged when you remove the restrictions imposed by exhaust systems and intake filters. At idle and low-throttle situations when you are using the pilot system, your "restriction" is only the throttle slides. Nothing has changed there, so no need to change the pilot jets.

.
 
You must log in or register to reply here.
Back
Top