• 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.

what do the wee drills drill.out in carb kits...?

  • Thread starter Thread starter Seana23
  • Start date Start date
S

Seana23

Guest
Jus wondering...
Seen a carb kit and it included a tiny drill bit....
What.is this used to do?

Thanx.
Xxx
 
Which kit?
With Dynojet kits the smaller bit drills out the port in the slide. The larger is for removing the USA cap over the idle mixture screw.
 
On some kits the drill is for the CV Carb Slider Vent Hole, makes it bigger.:-s
A small hole means the slider will rise slow, so no matter how fast you whack the throttle, the engine won't spin up too fast.
For a snappier response, drill the Slider Vent Hole larger.:)
 
the hole is not straight down, you have to drill at a slight angle.
 
Wizard said:
On some kits the drill is for the CV Carb Slider Vent Hole, makes it bigger.:-s

For a snappier response, drill the Slider Vent Hole larger.:)
Click to expand...

Is that the tiny hole on the base ov the CV piston next to the needle...?

Xxx
 
Not sure what your slider looks like, but if its a hole that goes clear right thru and seems to have no purpose, that it.
When I did the measuring (use a drill set to slide small drills thru, get the original hole size), the new drill increases the hole AREA by 50 to 100%.
The increase is a PI-R-squared thing, so its not a doubling of diameter.
You'll have to do the arithmetic
nerd.gif

I lent my Stage One Kit drill to STJohn who did not install a DynaJet Kit, but did want the throttle snapiness, so he drilled out his Vacuum Lift Vent Holes (carbs were very similar (84 VF1000F/84 Saber1100)).
 
Last edited:
Couldn't rember what my Needles were set to :confused: (installed in 1990, and I didn't write it down), so I took one Carb Cap off.
My CV pistons have 2 vent holes, and some Carbs can even have 3.
My Honda vent holes were vertical (not on angle).
My needles are at the Leanest position,,.. this bike was set Very Rich from factory (Calgary = 3300').
 
Interesting. And what would happen if this hole is drilled a bit too big?
Are there any other mods that need to be made with this one?
What are the pro's, and con's attached to this mod?
 
The drill size will depend on whether you install the Stage 1,2 or 3 kit.
Too big and the beating manifold vacuum from the cylinder sucking can bias it. Throttle might be too touchy.
No other mods needed, a standalone mod.
Pro's? Snappy throttle response.:o
Cons? Snappy throttle response.:-s
I was riding to work one morning when I whacked the throttle to make a lane change, and the bike turned sideways on me,,.. was frost on the road, hard to see.
Didn't fall, but I sure needed that first coffee (and a change of shorts,,..:-$). Be careful what you wish for,,..
If your bike performs fine for your needs, leave it alone.
I installed a DynaJet Stage 1 kit cause the bike was jetted stupid rich from factory, and there was no adjusting the needle.
I went down a lot on the main jet and the needle is all the way down (lean as it gets). Here we ride 3000 to 6000' and its cooler.
Most bikes will get the biggest punch by getting the jetting right for your altitude/temperature.:rolleyes:
 
Last edited:
You must log in or register to reply here.
Back
Top