New to this, can someone explain what 1st,2nd & 3rd clip mean when it comes to jetting? What do these different settings do? Thanks for any help.

 

im pretty sure the 1 2 and 3 clip is on the needle and it makes the engine run either lean or rich, depending where u put it.

 

Go up with the clip to lean down with the clip to richen it.

 

If you drop the clip you raise the needle, which will let more gas enter the main jet.

 

Just in case they didn't answer all of your questions.....

The needle is in the carb slide. The needle raises up and down with vacuum when you open the throttle. The needle passes down through the main jet. When at idle, the needle is fully down and depending where you have it set on the 'clip position', will determine how it runs.

Generally, needle position has nothing to do with idle. If your machine won't idle, then the air mixture screw or pilot jet should be suspect. When you start to open the throttle, the vacuum causes the slide to raise and the needle to lift out of the main jet to allow more fuel to flow. The needle is tapered, so when hitting midrange, it starts allowing gas to flow more rapidly and when you have the throttle wide open, the needle is completely out of the jet and the fuel is flowing to the max of whatever size your main jet is.

Most needles have 5 or 6 positions. You usually start on or around the 3 position from the top. You need to make sure your machine idles before doing any modification. Then start doing the mods and install the carb kit...i.e. needle, jet, pilot jet (don't usually have to change) and air mixture screw setting. Many carbs have the air mixture screw sealed and you need to drill it out and pull out the plug with a screw....you just drill the cap and stop....screw the screw in and pull with a pliers.

As far as needle position, like I said, the throttle causes the needle to rise and fall via vacuum. If you have the clip on the lowest position from the top of the needle, then the needle will be raised up and further out of the main jet at idle....if the clip is at the highest position from the top, the needle is lowered down further into the main jet. Again, the needle generally affects midrange and top end.....generally.

I just put a pipe, dynoject kit and filter in my KLR650 Enduro. One thing cool about the carb (Keihin CVK40) is that they use them on Harleys and you can get an external ( has a ****) mixture screw so you can change settings without removing the carb or while it is running. If you look at this pic, you will see the brass **** on the lower right of the carb for the air mixture: air mixture screw

good luck

 

Man wish I could adjust my mixture screw that easy.

 

notice right below it is the starter....so the only way without the **** is to loosen the whole carb, rotate it and then get a tiny screwdriver....luckily I found that ****....talk about easy. When putting in a Dynojet, generally you turn out 3.5 turns from bottomed. Stock is 1.5 turns. Then you screw in until you get it to miss some at idle, then back it out about a 1/2 turn. Just too easy with the ****.....

 

Can I get one of those ***** for my carb?

 

it depends on the carb that you have.....is it a 40mm Mikuni or a Keihin....I know they have some other ***** out there, but depends on the carb...is your carb a pumper or CV?

 

40mm Mikuni CV.