Question about Traxxas T Maxx 3.3 Monster Truck

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Where you screw in thr high speed needle seems to be striped i think. the fuel keeps squirting out. is there any way i can fix this problem. do i have to tap it out or replace the air intake? thanks

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Probably will have to purchase new carb or possibly a carb rebuild kit.

Posted on Dec 08, 2009


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How do I adjust the carburator?

There are two needle screws that can be adjusted to make the engine run properly. Be certain that the carburetor is clean and the diaphragm is in good condition, and the fuel is new. The two needle screws mentioned above should initially be adjusted at one turn open from turned in all the way (lightly seated). Each of these needle screws performs different functions. One is for idle and throttle response (this screw is marked "L" and the other screw is marked "H". L and H are marked on the carburetor body and also on the plastic "shroud" near the adjustment screws. These screws are not interchangeable, being foolproof since the thread sizes are not the same. When properly adjusted the low speed screw (L) allows the engine to idle properly and throttle response will work properly. When the high speed screw is adjusted properly the engine will have correct power at full speed. Adjust the low speed screw so that the engine idles and when you squeeze throttle all the way to wide open the engine should not hesitate and should come up to full speed and when you drop the throttle it should idle nicely without stalling. Now adjust the high speed screw. Hold throttle wide open, holding it there while you adjust the high speed screw. If this scares you (be carefully so that the spinning chain does not cut you!) you may adjust the high speed screw at idle, turning it just slightly in or out. The high speed screw should be adjusted so that the engine does not run clean at wide open throttle but sputters slightly, slightly adjusted open from running clean to slightly sputtering. When under load (cutting a log) the engine should run clean. Good luck!

May 21, 2012 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

I have a two stroke whipper snipper that keeps stopping

Hi tracey4t, I will try to give you a few suggestions. You might have to adjust the idle speed screw that is located top on the carburetor where the throttle cable is hooked. There you will see a screw with a spring that if you turn it clockwise you increase the idle speed, and if turned counterclockwise will decrease the idle speed. It could also be a carb adjustment of the low or idle speed mixture needle, if there is one on your carb. In the past few years, most carburetor makers have eliminated 1 or 2 of the adjust needles. These ports are now inside the carb and are fixed, not adjustable. If you have a low speed needle or the 2 needle adjustments, they are positioned about the center of the carb. They have springs on them. They are marked by L or H on the carb body, and the low one is usually the one closest to the engine. Turn it out or counterclockwise to add more fuel to the mixture. Do this 1/8 of a turn at a time while the engine is running. The engine should turn faster if that is what is needed, keep doing this until max. RPM. If that does not increase the idle speed, try turning it the other way. If that does not work, then it could be a number of things, but I think this will work. Hope this is helpful to you. All the best and good luck. Denis.

Feb 25, 2011 | Garden

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Engine acts like it wants to quit asif its about of gas which it isnt

Hi, I will try to help you out. I think it just needs adjustment, probably the high speed mixture needle located on the bottom of the carb. Get it running at high speed and try to turn the screw in 1/8 turn increments. It sounds as if it might be flooding out. Turn in (clockwise) 1/8 turn and wait a little, it takes a few seconds before you hear the difference. If it seems to run a bit better try that again, if worse turn back to original position and turn it the other way to add more gas to the mixture. If a bit better try that again and listen for the difference. If that that does not work at all try the low idle mixture screw which is located on the side of carb, it has a spring on it just like the high mixture screw. Do the same as previously described and see what happens. Some might say the low needle has nothing to do with the high speed, but it does have some effect as you will notice. Bring to idle and adjust for smoothest speed.
Other things that could cause that is the fuel tank cap vent hole might be partially blocked. (if you remove fuel, air must be able to enter so a vacuum does not stop the flow of fuel). Something that happened to me is that the shut off valve under the tank gradually closed with the vibrations causing low fuel flow. The carburetor might need cleaning or the fuel filter might be plugged. The gas tank might have dirt in it limiting fuel flow. The governor might need adjustment. With the more load you put on the engine, the governor should feed more fuel to the engine to compensate. Is there an air filter on this engine, if there is check it out and clean or install a new one.
That is about all I can think of right now. Without hearing it run it is difficult to give you an exact fix. All the best and hope this is a bit helpful to you. Good luck. Will gladly answer any other questions.

Feb 03, 2011 | Tecumseh Horizontal Tiller Engine 8 Hp, 1"...

1 Answer

I have a craftsman 917298231 tiller, that has a 3hp briggs and stratton motor. The problems seem to be that it is not getting any fuel. The motor will run for a short time when gasoline is poured in the...

Hi, I will try to help you solve this problem by checking the easiest things first. Do you have a shutoff valve under the tank and is it open? Did you check for dirt inside the tank that might be blocking gas flow, and the fuel line also? Have you looked for loose bolts and gaskets at carb that could let air in and prevent suction bringing gas in combustion chamber? When was it last used and how old is the gas in the tank or has everything dried out? As gas evaporates it leaves a sticky sludge that can plug up small ports or like the inlet needle not letting fuel in.
I really think the problem is with the carburetor either adjustment or that it needs cleaning. Look at the carb and maybe even make a small diagram to remember where everything goes specially the governor rod and spring.
Shut off the fuel valve if you have one. If you don't go ahead and remove the carb from engine. Disconnect the governor rod and spring, the ends are just bent in a special way so you can slide them out of the holes by moving the carb in different positions. Remember which holes they come from, (very important) and try not to bend anything. A little patience is helpful. Now remove the fuel line, lift up the carb as you do and get a golf tee or a pencil to plug the fuel line so gas does not come out.
Remove the special bolt at bottom of carb, it has small holes drilled into it that have to be cleaned very well as they are part of the high speed mixture circuit. Look for a very, very small hole drilled on the side of this bolt towards the thread end of it. There will be a slot machined in the threads and this is where this hole is. Make sure it is clean, (do not use any wires to clean these passages as they might be damaged) The high speed mixture adjustment needle is usually part of this bolt machined into it but not always. If it is not then the high speed port is fixed and has no adjustment.
Now you will find the float, gently move it up and down to see if the inlet needle might be stuck which could be the main problem, not letting gas in. The float is held on with just a pin that you pull out to remove the float and inlet needle. (before removing the pin look for a little wire clip that holds the inlet needle to the float. Remember exactly how it is positioned) Now remove the screw situated on the side of carb, it has a spring on it. This is the low speed idle mixture adjust needle. (BEFORE removing either the high or low adjust needle, turn clockwise until GENTLY seated and remember the number of turns for each one)
Now clean all parts with paint thinners or carb cleaner. (NOT rubber parts) Blow low pressure air into all parts. On the outside of the carb look for a small vent hole, either on the low adjust screw side or the other side, it is again very small and has to be clear. (between me and you I sometimes cheat and use, being very careful a small brass wire or stiff plastic to help clean ports and passages when badly plugged. If you decide to go that way, you do on your own.) Before reassembly check needles for any damage like having been seated too hard and they are marked. If any damage and gaskets don't look too good get a carb kit, they are not that expensive.
Now carefully reassemble. A start for the high and low speed mixture adjust needles. The low screw on until lightly seated and back out 1 turn. The high speed mixture needle on the bottom of carb on bowl bolt, turn in until lightly seated and turn back out 11/2 turns. This is what the manufacturers suggest as a start that should get the engine going to make final adjustments, They are usually very close to being right. There is a screw on top of the carb, this is to adjust the idle speed so that when you release the throttle it will not stop on you. Adjust the way you like your idle speed to be at. I hope this gets you going. Final adjust of carb needle screws is not too hard if you take your time.
Do not go too lean, which means not enough gas in the fuel air mixture as it could make your engine run too hot. When you turn a needle screw in (clockwise) there is less fuel and when you turn out there is more gas in the mix of air and fuel. When you make adjustments go 1/8 turn at a time. Another point is when you push on the throttle to get more speed and it sort of misses or hesitates. turn low mixture screw out (counterclockwise) to get more gas in mix until it accelerates without missing.
Reinstall the carb on the engine, (you might need a new gasket, I suggest you get a new one) Be specially careful with the 2 governor linkages on the carb. If you got a carb kit there should be one included.
I hope I have given you enough info to do this. If you do this yourself I am assuming that you have a bit of mechanical experience as this is not that easy to do. I certainly hope this is helpful so best regards and good luck. I will gladly answer any more questions.

Feb 01, 2011 | Craftsman Garden

1 Answer

Why wont my chainsaw tick over, it revs up but not tick over. also, cannot start it after 2-3 mins of usage, why?

Check the air cleaner and muffler for plugging. Try turning the idle speed screw (not the L jet screw) CW one full turn. Does it now idle? If the chain keeps turning at idle, back off the speed screw until the chain stops after revving the engine. When the engine won't start, remove the spark plug and check for blue, snappy spark. If the plug insulator is black, try a new correct type plug. If sparks ok, then squirt some fuel mix into the plug hole, replace the plug and try to start. If you get a pop or two, then fuel delivery is a likely problem. If it again runs, the plug may have been the problem. Otherwise, check the fuel filter, fuel line, and carburetor for any loose fasteners. Finally, run the engine at full throttle--it should 4-stroke with no load, but immediately 2-stroke when cutting. Adjust the H jet needle to achieve this. hope this helps!

May 19, 2010 | McCulloch 16 Inch Gas Chain Saw MCC1635AK

1 Answer

Trouble startin , does not go full throttle and keeps stoppin.

First make sure you have about 1mm gap on carb opening and fine tune with trims. The high end needle can now be turned in about 1/4 of a turn and start. Keep trying to start while turning high end needle in a fraction in at a time, say after about 5 to 8 pulls of starter. Once engine is started come back out with screw a fraction to see if runs ok if not go back in.

May 18, 2010 | Traxxas T Maxx 3.3 Monster Truck

1 Answer

Starts, idles and runs but quits after a few seconds of cutting

Check the air cleaner and muffler for plugging. One screw adjusts the idle stop (idle speed) position and the H and L jet screws set fuel mixture for high speed and idle speed mixture respectively. Turn both jet screws CW to stops (lightly) then back each out CCW 1-1/2 turns. This is a basic setting and should allow the engine to start and run. Start the engine and allow to warm up. Pull the throttle full on and adjust H CW until the engine starts to speed up, but 4-strokes. Correct adjustment is when the engine 4--strokes running free, but immediately 2-strokes when cutting. Release the throttle and adjust L needle CW until the engine idles fairly well, but allows the engine to 'follow the throttle'. Adjust the idle speed screw so that the chain stops turning, but the engine will continue to run. Hope this helps!

May 17, 2010 | McCulloch 16 Inch Gas Chain Saw MCC1635AK

1 Answer

I have a styll chain saw 012 av put a carbie kit through it but still cant get it running right seems to be leaking fuel threw the adjusting srews high and low

Sounds like the screws are ready to fall out. Turn both screws CW to stops (lightly) and back CCW 1-1/2 turns each. This should get it running--warm it up. Open the throttle and adjust H needle for highest speed, but 4-stroking, which should immediately smooth out with a light load (cutting). Next, set L needle for fairly smooth idle but allow the engine to follow the throttle. Set idle speed just below chain movement. Hope this helps.

Aug 26, 2009 | Garden

1 Answer

I seem to be going through a lot of gas in a short period of time. I have 3 adjustment screws on my Homelite XL 10515A chainsaw. which one controls the fuel flow and which one the idle speed

Two of the screws are fuel related: H = high speed and L = slow speed. The third is idle speed and is a limit stop for the throttle lever. Turn both mixture screws in CW to stop (lightly), and back out CCW 1-1/2 turns each. Start with H needle after engine warm-up. Open the throttle full and adjust CW until you reach highest speed with 4-stroking, but smooths out when cutting lightly. Allow to idle, and adjust L needle CW for smooth idle, but rich enough to allow engine to follow the throttle. Adjust idle speed screw to allow the chain to stop turning. Make sure to clean the air cleaner before this procedure.

Aug 16, 2009 | Garden

1 Answer

No power and high fuel consumption

Suspect worn needle valve & seat assembly !---Quick test , with care>Whilst riding on open road &holding throttle at set position, switch off fuel supply & note IF engine speeds up, IMMEDIATELY Back off throttle, watch rear vision mirrors for traffic behind & switch on fuel supply!---If that small test indicates Carburettor area of further examination, UNLESS YOU ARE QUALIFIED the needle valves need to be examined byTrained eye!-(Especially wear on sides of needle valve & ALSO, check "floats"Stay Upright Des

Jan 08, 2009 | 1993 kawasaki ZZR 400

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