• 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.

1981 Gs1000g CV main and primary jet size

  • Thread starter Thread starter Miff
  • Start date Start date
M

Miff

Guest
I have an '81 GS1000G running CV carbs with pod filters and an aftermarket 4 into 1 exhaust. Can someone please confirm from their experience what size main and primary jets should be used?
 
You can try various stock jet combinations but the easiest way to get it working is to go with the Dyno-Jet kit. They problem you run into using the stock jets is that the middle ground (needle and needle jet) aren't great. The DJ kit replaces the needle and provides a method to replace the main air jet as well. DJ spent a lot of time and research on developing the combination for stage 1 and stage 3 (yours). It's a tried and true combination that works.
 
Thanks for the comment, I have used DJ kits on other bikes and been pleased with the results but I was hoping someone had a good setup on the GS1000 by swapping jets, I'm trying to keep the cost down.
 
Not all pods nor 4:1's are the same, thus the jetting requirements are different between them. Hopefully you have some proper pods like K&N's instead of junky Emgo's or similar. Typically, assuming a good quality exhaust and K&N's you can expect to bump the mains at least 3 sizes, shim the needles, and maybe even one size up on the pilots. This is just a wild a$$ guess though.
 
Wild a$$ guesses are all that anyone's going to be able to do. If you have luck with the DJ kits in the past then that may still be your best solution. When you consider the time spent changing jets out, frustration and the number of jets you'd have to pick up it may very well turn out to be the least expensive option.

Do update us as to what pods and exhaust you have currently.
 
DSC05494.jpg
This is the exhaust......
The pods are Pipercross, I also have a set of Chinese K&N's.
 
Carbs can look new but still be clogged. Have you done a thorough cleaning? Those fuel enrichment screws look pretty backed out. How many turns do you have them set at?
 
14264926_10210712758282909_1743548494698479470_n.jpg
I've had them apart, completely stripped, float levels set and balanced...several times. The air screws have been down as much as 1 1/2 turns but are currently 2 turns out.
 
If that's two turns out then they were never seated at the start. The screw heads would not be flush with the tower.

The jets may look good but if you haven't disassembled, dipped, poked and sprayed the carbs properly then it's not done. It's the small passages in the carb body that's more of a concern as they are the usual area of trouble. Even the float bowls have a passage that's critical to proper operation. It's hard to tell but the pilot air jet looks like it wasn't removed and cleaned from the pic. Why did you do the rebuild "several times"? Should only need to be done once.

Not trying to be a pr!ck but just pointing out that there is a lot of detail to doing a carb rebuild job right the first time.
 
Last edited:
Your not a Prick! That's why I'm here asking for advice and experiences..... Seafoam has been used as a cleaner and fuel additive, I have stripped them a few times whilst changing jets, primary's have been removed and are cleaned whilst scratching my head for reasons it wont take full throttle. Currently running 127.5 main jets and stock primary. A friend tells me he had 110 mains and 37.5 primary's, does that sound right?
 
Miff said:
A friend tells me he had 110 mains and 37.5 primary's, does that sound right?
Click to expand...

Those are even small then the stock mains and pilots assuming that you meant pilots instead of "primary's".;) I still say go with the DJ kit. Save yourself a lot of grief.

Just in case you haven't seen it, here is the CV carb rebuild tutorial that may help.:

CV Carburetor rebuild tutorial
 
Had a think and I'm saving up for a DJ Kit...lol
One thing though, I had another look just to confirm, the air screws at 2 turns out has the head level with the tube? Both sets of carbs are the same.....
 
Factory setting is closer to 1 1/2 turns out and then a anti-tamper plug is inserted on top. At 2 turns out it should still have plenty of room for the plug so being level with the top of the towers makes no sense. Something isn't right.
 
Last edited:
I have the answer... pic to follow as soon as I get it off my phone...
 
I bet that someone filed down the towers after they cut a slot into them to remove the screws.
 
20160912_155509.jpg
I've had US spec Intruders a VL1400, It had the Cali spec charcoal canister and blanked off air screw caps. I junked the canister and fitted a DJ kit to that. I also have a VL1500 that too came with air screw blanks, they were removed and I imported a Gman stage 3 kit and fitted that. I took a close look at the air screw in my GS1000.....all becomes clear when you compare it to a US market bike.....
 
That would do it. Not sure if the taper is the same so be cautious on the mix and match of the parts.
 
You must log in or register to reply here.
Back
Top