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Starts but will not keep running

Need manual for adjustment on needle valves

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Posted on Jan 02, 2017

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SOURCE: adjusting carb on husqvarna chain saw

Hi First turn them(H and L) clock wise until the end and then adjust.

high speed H=3/4 turn

lowspeed L=1 1/4 turn

idle speed T adjust accordingly

best regards savumihai71

Posted on Jan 19, 2009


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How do you adjust idle speed 1991 johnson 100 hp

not important, what's important is that they are absolutely clean, including the four brass high speed jets located in the bottom center portion of the carburetor.

That model engine's carburetors has fixed jets, BUT if the slow speed jets are adjustable, earlier model carburetors have been installed. If so...................

The four adjustable needle valves control the flow of fuel in relation to the set air flow, adjusted as follows (if needed).

(Dual Carb V/4 With 4 (2 each carb) Slow Speed Adjustable N/Valves)
(J. Reeves)

The adjustment procedure of the carburetor slow speed needle valves follows. NOTE... if the needle valves turn too freely, replace the nylon bearing retainer (the nylon item at the front of the carb that the needle valve goes through first) with the newer type RED retainer #315232. If your engine has that weird linkage that connects all four of those needle valves, the newer RED retainers will enable you to discard that linkage. The RED retainers make it impossible for the needle valves to vibrate out of adjustment.

(Carburetor Adjustment - 2 Slow Speed Adjustable Needle Valves, each carburetor)

Initial setting is: All (4) Slow speed valves = seat gently, then open 1-1/2 turns.

Facing the carburetors, start with the top left needle valve, then the top right valve, then the bottom let valve, then the bottom right valve. It may be necessary to redo these steps to get the adjustments ideally set

Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running.

Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

Do not attempt to gradually adjust all four of the valves at the same time. Do one at a time until you hit the above response (die out or spit back), then go on to the next valve.

When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.

Jun 28, 2017 | Cars & Trucks

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My Sears tractor has white smoke pouring out of it right after starting. It is fairly new,, some 217 hours on it.

Answer to your question is this,if this keeps up smoking,i would check the carburetor fuel filter,for signs of gas collected up in the filter. If there gas you need to adjust the carburetor,by adjusting the fuel mixture. The carburetor uses both fuel and air mixture. To much fuel(Rich) floods the carburetor,too little fuel(Lean),there is more air than fuel. You will have adjust the carburetor's needle valve to receive the correct balance between the two. To do this check the carburetor for a slotted screw,take a screwdriver. Turn the screw in to get a lean mixture,turn screw out to get a rich mixture. After making your adjustment,start the tractor,if not already running. Watch to see if it is still smoking,if it is, adjust the needle valve screw in more until the smoking stops,also keep watch on the filter for gas,in the filter assembly. This is not where your gas needs to be. I need to inform you to also,to be sure that the air filter is cleaned up(No Gas Accumulation in the filter) -This is a must do to possibly,keep from having a (FIRE). When making fuel adjustments,i would check the spark plug(s) for carbon deposit building up,that would cause the motor not to start,or run smoothly. Anyway,be SAFE,your dealing with GAS. Sincerely, Brad Locke 12/03/15

Nov 30, 2013 | Sears Garden

1 Answer

I have a Husqvarna 125 blower. Where do you start adjusting the high/low needle valves. Do you run them in and then do the 2,5/2 turns you mentioned. They are not set from the factory. Had trash in the...

2 needle adjusters? one should be marked L & the other H.I hope you removed them for cleaning. Re-install them turn to the right until they stop.Then back them out [ counter clock wise] 1 & 1/2 turns is a good guess to start from. try to start,you will need some patience for this as it is trial & error.Keep tweaking them until it runs. once you get it running the one marked L is low speed or Idle H is the high speed. Tweak them while its running for best performance. I just went through this yesterday with a john deere 2 stroke and ended up at about 1 turn out from full stop on the needle adjustments. I also did this with the air filter off so I could see when flooding was happening. When it did I had some compressed air to blast the excess fuel away. good luck

Oct 04, 2013 | Husqvarna Garden

1 Answer

I have a 15.5hp Craftsman riding mower with a 42inch cut I keep getting gasoline under the OHV valve cover and in the oil pan !!!!! The motor won't turn over !!!!!! I adjusted the valves and it started...

Needle valve and seat is the first place I would look. Sounds as though your needle valve is sticking in the carb. Since the needle valve and seat is the only way gas enters your engine, it fills the carb bowl, then because it's sticking/leaking, gas starts running into the engine.
Look for trash in the bowl when you remove the bowl. Shut off/drain the gas then pull the fuel line to the carb, pull the carb and spray some cleaner into the fuel inlet after you remove the float and needle valve.

Sep 29, 2017 | Craftsman Garden

1 Answer

Need owner or service or both manuals for Homelite model #UT10516


As far as the manuals... you might be able to download them at (you can click on the link) under customer service, you'll find "owner's manuals). To adjust the fuel/air mixture, start the saw and turn the adjustment screws in or out a little at a time until you get the saw running properly. There is no "set" adjustment... as the saw motor ages, those settings will change. If you make adjustments to the fuel/air screws and the saw stops running and starting, turn the adjustment screws all the way in (clockwise) GENTLY... If you force those screws you will damage the needle valve seats! Turn both screws out one and a quarter turns out, and the saw will start. continue adjusting until the saw runs properly. Have patience... it may take a while to get the saw running to your satisfaction.

Jan 18, 2013 | Homelite Garden

1 Answer

Bogs out

Try to adjust the "H" needle (CCW) a little. If you must choke it to run it is lean. Check for a loose muffler, a common problem on this saw.

Carburetor Adjustment by
  • CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
  • Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.
  • Clean the spark arrestor and muffler; if the saw cannot exhale it cannot inhale.
  • There are 2 wav (sound - idle & full - may not be highlighted) files that I find most helpful, I think you will too.
I am going to inject a little philosophy here. Undetected air leaks and defective fuel delivery systems account for most chainsaw failures. Constant adjustment of needle valves can easily camouflage more serious problems that result in burning up your saw. A sudden need for an adjustment may be indicative of a larger problem.

Initial starting point is “L” & “H” needle valves 1.5 CCW from lightly seated, then adjust for performance as above.

If you have more questions or need additional help please reply below and I will get back to you. HTH & Good Luck.
Thank You for using FixYa.

May 02, 2010 | Husqvarna 350 18 Inch Gas Chainsaw 52CC...

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...

3 Answers

1984 yz 125 power valve how do i set it

You don't have to do anything It does it on its own as long as the pieces are all there. The power valve is the thing that opens up a larger exhaust hole for the two stroke engine. It is shaped like a spool and it twists as pressure builds due to high rpm. On the 1984 it is on the left side of the bike right up front behind the clutch cover.

Aug 04, 2009 | 2003 Yamaha YZ 125

1 Answer

Carb and valve adjustment

Dear Craig,
Presuming that the carb is clean !
It seems that you have either set the float level incorrectly, or allowed the needle to become jammed. The float bowl should a little less than 3/4 full of fuel when the fuel is shut off by the needle and seat.
Check that the needle and seat are working correctly by blowing in the fuel pipe, and then closing the needle by hand. Check that the flow is stopped when the needle is fully raised.
The needle and seat do need to replaced from time to time, but generally last well.
If the needle and seat work, then look at the float level.
Further check to see that the floats are not filling with fuel. If this is the case, then the floats will have to be replaced as most repairs are only temporary.
When the floats are fuel logged the needle will not be raised and fuel flow to the carb will be continuous.

Feb 14, 2009 | 1996 Honda XR 600 R

1 Answer

Carb adjustment Idlle and speed

My answer:

It appears you have a B&S Vanguard series engine on your Genset.

Briggs & Stratton 9 HP Vanguard OHV Horizontal Engine, Model# 185432-0242-E1

MAX RPM's - 3600

I'm hoping you first got all the contaminated sugar & gas mixtureout of the Genset's gas tank, fuel lines (replaced the fuel filter aswell), and the engine's Carb before running it. Hopefully you DID NOTrun the engine even 1 second with that contaminated sugar gas - elsewise the damage may already have been done to the engine & the OIL!Did you change the engine OIL as well? Hope so! Did you try run it thatway with or without the air/fuel Adjustment Screws set properly? If so- we can only hope for the best here.

It's hard to say if any internal damage wasdone unless the Carb first is fully broken down, thoroughly cleanedout, and then checked forproper Float setting, then re-assembled, and then adjusting theFuel/Air Adjustment Screw(s) properly.

If all looks good with the Carb Bowl then you will next need to check the air/fuel mixture Adjustment Screw(s).

That missing plastic top off the Idle AdjustScrew head can either be replaced by something closely matching it byusing Super-glue or else 5-minute Epoxy, or else can be replaced with acrimped on slotted metal cap. If you have a Dremel Tool with a diamondcut wheel you can just cut a slot in the top of the Idle Adjust Screwhead for use with a slotted screwdriver. Hopefully you are handy!

On your B&S Vanguard engine there is probably only 1 air/fuelmixture Adjustment Screw - as from the Carb parts diagram that you canfind by following the directions further below for reference. If youhave any missing parts from the Genset sabotage then those might beordered from that B&S parts list there as well.

Usually there are 2 Air/Idle Adjustment Screws side by side, but yours looks to only have 1. (See diagram at that B&S site)

If there are 2 needle valves on your Carb then turn both of them in CW just until they are fully closed or seated.

Do not force them or you may damage them.

If you have 2 adjustment screws do the following below - otherwise just set the IDLE Adjustment Needle Valve Screw accordingly.

Open the High Speed needle valve adjustment screw 1-1/2 turns CCW, andthe Idle Speed needle valve adjustment screw 1 turn CCW. Normally youcould open both up the same 1-1/2 turns CCW without any harm. Either way is fine.

This will give you the initial adjustment starting point so the enginewill start and warm up so you can do the final adjustment.

You should make sure that the air cleaner is on before you make any adjustments to the Carb.

To make the final adjustments you will need to move the governor (throttle) speed lever to the IDLE position.

Set the Idle SPEED adjusting screw (and NOT the Idle Adjustment NeedleValve Screw) to get approx 1750 RPM - if you have a TACH all the better(you have to hold the throttle lever against the screw while doingthis).

Turn the Idle Needle Valve in CW just until the RPMs slow or the enginestarts to cut out. This is a lean mixture btw. Then turn it out CCWjust past where it will idle smoothly. It will run unevenly, but thatis OK. Now turn it back in CW so that it's just halfway between the twopoints. Then release the throttle lever.

Then do the same with the High Speed Needle Valve Adjustment Screw withthe governor (throttle) set to the FAST position. You do not have tohold the throttle while doing the high speed valve. The engine shouldrun smoothly, and also accelerate smoothly from Idle to Fast withoutany hesitation or stumbling. If not - readjust as needed to get aslightly richer mixture.

The Genset AC Output Voltage is all factory preset and pre-determinedby the engine MAX RPM, and also by the LOAD you are running on thegenerator head. Use to a good DVM to double check the output AC voltageaccording to your Operator's Manual, unless your Genset has its ownanalog AC panel meter.

Please do post me a reply as to fixing your problem here, and the resolveto it by following my recommendations above. Also please rate mytroubleshooting fix as well.

Here is the B&S site info -

You can view a breakdown IPL of this engine at this site:

Just mouse click on the Shop Online Parts Look Up icon.

Then mouse click select the 2nd Folder grouping for (100000 - 19Z999)> Then click on Folder (185400 to 185499) > Then click on(185432-0242-E1) > Then click on Carburetor from the right hand sideOptions > Then you have the Carb diagram with parts list. Use theIcons in the upper right diagram to Enlarge or Shrink the Carb drawing.

This Carb may have a Float Needle and O-Ring Seat or may have just the Float Needle with a Black Rubber Tip and NO O-Ring Seat.

If the Float Needle is all metal, then there is a flat O-ring seat inthe inlet port that the needle seats against. If the float needle isthe long needle type with the Black Rubber Tip, then there is NO O-ringseat and the Float Needle seats right against the Carb housing.

Keep me posted and I'll follow up as well.

Best regards,


Aug 29, 2008 | Coleman Electrical Supplies

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