Question about 2004 Yamaha YZ 450 F

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Manual How to change needle setting on carb

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Depends on the type of carb, but you must remove needle and there is a sir-clip with slots on the top of the needle. it can be poped off and moved up and down on needle. may have 5 different spots on it. Factory setting will be the center slot. This will enrich the mix or lean it out.
Needle adjustment

Posted on Apr 16, 2014


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The carburetor has gas flowing from the tube vents when i turn the fuel on. i heard it has something to do with dirt or debris in the needle valve, but how do i fix this?

it may be due to a few things like:
1. The needle valve or its seat is worn. You have to change it as a set. This involves opening up the carb.
2. There may be some debris or varnish between the mating surface of the needle valve and seat which also requires opening up the carb and cleaning with carb cleaner.
3. You carb float level setting may be incorrect. You have to know the float height from the manual and then have it adjusted. There is usually a small metal under the float which is used for float height adjustment.
4. Your carb float may be stuck and this usually happens when the bike is on its side stand and not used for a long time.

Aug 14, 2011 | 2005 Yamaha TT-R 125 L

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Need to find proper carb needle valve settings for case 444 Kohler

This is the Kohler K321 engine.

You can find the service manual here: (14.16 mb)

The inital carb adjustment setting procedures start on page 29
Kohler carb low idle 2 1/2 turns from closed Walbro carb 1 1/2 turn from closed
Kohler carb high idle 3 1/4 turns from closed Walbro carb NA

Thanks for choosing FixYa,

Jul 08, 2011 | Garden

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Hi, I have a 2004 883 Sportster converted to a 1200. It has the Screamin Eagle carb kit, Screamin Eagle II slip on mufflers & a Sceamin Eagle air filter backing plate with K & N filter. I want to...

The service manual says to "remove the carb" for this job. But yes you can remove the main jet out without removing the carb out. You can rotate the carb and slide it off the intake, but watch how much slack you have in the cables, remove the bottom plug that adjusts the fuel mixture.Take the seat/tank off and loosen both the 3mm bolt and philips mounting screw so you could turn the carb to were you could remove the big bottom 17mm bolt . When you look up into the bolt hole with a light you can see two access holes for both the main and the pilot jets.the pilot can be changed by tilting the carb bottom to the left and removing the big bolt on the bottom. It's accessible without removing the float bowl. To get the needle out, you need to pull the seat and tank, remove the carb top cover (3mm allen bolts), remove the 4mm allen bolt on top of the slide, being careful not to lose the spring and other parts (3 pieces total). Pull the needle out with a needle nose and you're set. The main jet is replacable from the 17mm cap on the bottom. Your needle tube/jet may come out with the main jet but is no biggy. You can drain the float bowl before doing it if you loosen the little 3mm bolt on the bottom of the bowl. Just be sure to readjust the throttle cables after you move the carb back. Tilting the carb pulls all the slack out of the cables and the bind a bit if you dont pull them back. You can remove the main jet with a main jet tool or a 1/4 inch socket. If the needle tube jet (long skinny tube that the main jet threads into) comes out with the main jet, simply unscrew it from the main jet with an 8mm wrench and the tool you used to take out the main jet.You can put the new main jet back in the tube first and then replace the tube back into the carb. The needle will be hanging out of the bottom of the carb where the tube goes. Because you have the carb at an angle the needle will be hanging at an angle, so you need to "thread" the needle into the tube to get it to go back in.Be sure not to over tighten the main jet because you can break it off. Also when you turn the carb, the front boot can turn if it is not tight (this is common on this bike). Be sure to line up the notch on the bottom front intake boot and tighten the front clamp. It is hidden under the crankcase vent hose that runs over the top of the boot. Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Jul 01, 2010 | Harley Davidson XL Sportster 883...

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Gas running straight through the carb, float needle still intact

take your float out and see if it will float if it sinks replace it also replace the needle set.

May 12, 2010 | 2004 Suzuki RM 250

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'bogging' down in low gear

your carbs will need a good service ,pinning the throttle wide open wont help either ,so open throttle slowly. I expect your needle valve in the carb has gone oval ,it should be round allso check the needle condition no scores, but first clean and adjust your pilot screw,best thing is to get a haynes manual to find the proper setting for it,but quite simple to do.

Mar 12, 2010 | 1993 Suzuki GSF 250 Bandit

1 Answer

The sump overflows even after I changed the float needle

The original Keihen carbs that come on Harley's are notorious for this problem. They've been a problem since they first came out with the carbs back in the mid '70's. Someone makes a special tool that recuts the seat in the carb but the tool cost over $100, far too much to spend to repair a single carb.

Make sure the needle is a good OEM needle, make sure there is no trash in the seat, and you've got the needle attached to the floats properly. Are you setting the float level in the proper manner? The late model CV Keihen carbs specify that the float has to be set to a certain height while sitting on an angle of 30°, I think. The procedure is describe in the service manual but I don't have the book right here in front of me but I do know that it must be sitting on an angle when you set the float. I made a special tool out of wood to do this with. That's why I don't remember the angle. I made the tool and I simply sit the carb on it to make the float setting. Since I've made the tool, I no longer worry about the angle, it's built into the tool.

One thing you could do is set the float level about 1 mm lower. Sometimes, this puts a bit of extra pressure on the needle and helps. I wouldn't go any lower than that though.

Good Luck

Dec 23, 2009 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

How do I adjust needle valves on a 25cc Homelite UT08111A Backpack leaf blower?

Set the lowend & highend needles to about 1 3/4 to 2 turns each. Choke the carb or prime it, until the carb is wet. Fire up the engine and let it warm up. Let's set the topend first since it's the easier of the two. Go to full throttle. Adjust the topend needle for peak RPM. Leave it wide open for about a minute to see if it changes any. Should the engine go lean, open the lowend needle slightly, if this dosen't work... you will have to adjust the needle valve inside the carb.( I will explain this later) If the topend runs OK, then slowly pull the throttle down until the engine begins to "four cycle" hold the throttle there. Adjust the lowend needle until the "four cycling" barely stops. Now lower the throttle more until it "four cycles" again, and adjust the lowend again. Keep doing this until you reach full idle. Now, from full idle begin to throttle up until the engine starts to bog or hesitate. Open up the lowend needle just enough to eliminate the bog or hesitation.

hope this helps :)
if it does please vote

Oct 23, 2009 | Homelite Consumer Products Backpack...

2 Answers

Gas floods out engine,if I pinch the line (regulate the flow) I can get saw to run.XL360 homelite

I sounds like there is some dirt under the needle valve in the carb. Change the fuel filter first, if it is falling apart then it is very likely a piece of it got in the carb. Try spraying some carb cleaner directly into the fuel inlet to see if you can flush it out first, If not then your going to have to pull the side closest to where the gas goes in off the carb take out the little screw and clean under the needle valve.

Mar 19, 2009 | Homelite Garden

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