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General Category >> Rubber Side Down! >> Carb Slide
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Message started by rayce on 08/05/15 at 10:37:32

Title: Carb Slide
Post by rayce on 08/05/15 at 10:37:32

Does anybody know of any issues with the stock carb slide sticking and what symptoms that might have with the bike?

Title: Re: Carb Slide
Post by Dave on 08/05/15 at 11:04:31

Yep....they can stick.

The bike can be sluggish, slow to respond to throttle changes, doesn't run or idle smoothly, etc.

They have to be clean, and should not be oiled with anything. The coating on them is sufficient lubrication.

Title: Re: Carb Slide
Post by rayce on 08/05/15 at 13:37:33

The bike will fire up and idle just fine, but as soon as you give it gas to go it dies and will not start back up. I pulled the carb and cleaned it and noticed that some of the coating is starting to wear off. could this be causing my issue?

Title: Re: Carb Slide
Post by verslagen1 on 08/05/15 at 13:42:30

233028323433510 wrote:

That's not a slide issue, that's a main jet issue. possibly clogged.

The coating on the slide is black dry lube.

Title: Re: Carb Slide
Post by Kris01 on 08/05/15 at 16:21:28

Main jet issue right off idle? Please explain Versy.

Title: Re: Carb Slide
Post by justin_o_guy2 on 08/05/15 at 18:37:35

I've seen old gas do that.

Title: Re: Carb Slide
Post by gizzo on 08/06/15 at 02:23:49

What JoG said. If there's old fuel left in there (or in my case, you used food grade vinyl hose for fuel hose in an emergency then forgot about it :-[ ) it gums up and the needle can become stuck in the main jet. The engine can't make enough vacuum to lift the slide against that stickiness. So, it will fire up and idle just fine, but you crack the throttle open and the slide and needle just go nowhere, engine stops.
The vinyl hose in my case dissolved over a few weeks and left a horrible green goo in the float bowl and main jet. Took ages to make it nice.

Title: Re: Carb Slide
Post by Kris01 on 08/06/15 at 21:18:23

You guys are losing me. Off idle should be the jet needle/needle jet, right? The main jet won't do much until you really crack open the throttle.

Title: Re: Carb Slide
Post by old_rider on 08/06/15 at 21:22:00

Once again.... vacuum issue?

Title: Re: Carb Slide
Post by Dave on 08/07/15 at 03:47:00

4D746F753637060 wrote:

You guys are losing me. Off idle should be the jet needle/needle jet, right? The main jet won't do much until you really crack open the throttle.

The jet/needle is a above the main jet.....and is actually the brass tube that the main jet screws into. If the main jet is blocked....no fuel will flow through it and into the needle jet.

As the slide rises it pulls the tapered needle through the needle jet, and the amount of fuel flow is controlled by the space between the tapered needle and the jet. After about 3/4 throttle the needle is high enough that it doesn't restrict the fuel flow very much, and the size of the main jet is where the control of the fuel flow occurs.

Title: Re: Carb Slide
Post by JutMan on 08/07/15 at 09:22:53

This image helped me a lot

Title: Re: Carb Slide
Post by Kris01 on 08/07/15 at 11:08:28

Thanks Dave. I never thought about where the fuel came from to feed the jet. So you're saying it comes from the main. I learn something new each day!

Title: Re: Carb Slide
Post by Dave on 08/07/15 at 12:12:57

And this image helps a lot too.

This diagram does not include the TEV (transient enrichment Valve) which helps to reduce the backfire when you close the throttle. Also the idle mixture screw is shown on the bottom of the carb - while it is on the side of the carb on the Savage. And they call the jet needle the calibration needle.

Also notice how the idle fuel mixture screw is not the only place where fuel enter the carb at idle. The mixture screw is a fine adjustment to add some fuel to the mix - but there is also fuel going through other holes. This explains why your engine can still run when you have too large of a pilot jet and you screw the idle mix screw all the way in....your pilot jet is too big and allowing too much fuel to flow through those other holes. Your idle mixture screw should be about 1.5 turns out from lightly seated when your pilot jet is the correct size. If the idle mix screw is less than 1.5 turns in for the smoothest idle, then get a smaller pilot jet. If you have to turn the mixture screw out more than 2 turns to get the smoothest idle - put in a larger pilot jet. If you turn the screw out more the 3 turns......stop as the tapered screw is backed out of the orifice and you will not get any more flow by turning the screw out any farther.