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Experienced gardeners share their insights in answering this question :
Remove carbi. remove throttle shaft .the spring is around shaft,.

How to Identify and Fix Common Gardening Problems ?

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If the throttle arm doesn`t snap back, or it snaps back “weakly”, then a throttle return spring will need to be added. If you`re unsure about whether you need to add a throttle return spring or not, we suggest adding one to your order just in case.
The way it works is quite simple – the driver presses down on the accelerator causing the cable to pull the butterfly valve, and this in turn allows for air to enter the engine. As you start to ease up on the accelerator pedal that valve begins to close and allow less air into the engine.
The throttle return spring is located on the side of the carburetor.
There are two types of throttle return springs: one is attached directly to the carburetor or throttle body, while the other is part of the throttle cable. If the throttle return spring is broken, missing, or damaged, the throttle cable will not easily return the valve back to its resting position.
Throttle Return Spring – 1.75″ x 0.250″ x 0.034″
If the throttle does not completely return the cable may be binding, incorrectly routed, frayed, or corroded, which warrants further investigation. With the bike OFF, twist the trottle open to the stop and let go. Make sure the throttle returns to the closed position quickly and easily.
Noun. return spring (plural return springs) (mechanics) The spring that returns a door handle or knob to its original position when rotated.
A return spring is a spring in a keyswitch that keeps the switch open until it is pressed and returns the slider to its home position after the switch is released. Typically this is a helical (standard spiral) spring. The return spring is responsible for at least part of the force exerted against the operator`s finger.
Piston return springs in hydraulic cylinders allow one function of piston -non pressure side of cylinder to return to start position faster so the pressure circuit side can be activated again faster .
The purpose of a spring pack is to return the piston to its “home position” during clutch disengagement. They also perform a secondary function by ensuring the piston does not apply the clutch plates through centrifugal force in rotating clutches.
When the throttle gets stuck in an open position than your vehicle will receive too much air and cause it to have a high or fluctuating idle.
You might be wondering—is it safe to drive with a bad throttle body? The quick answer is no. Once it starts to show signs of going bad or being clogged, you should address the problem right away. Otherwise the vehicle may stall or fail to accelerate, creating a safety hazard.
You don`t need it. Technically, it`s only required by the government to return the carb to a non-open-throttle position. But there`s actually a massive spring on your carburetor that returns the throttle back to close.
A larger throttle body will give you a better throttle response as you will get more air each time you push your gas pedal.
There should be a small gap for the air to bypass at idle. There`s always a gap or a passage or a small hole in the wall or a hole in the throttle plate. Usually a gap, to help prevent metal to metal wear and friction.
Throttle response is the amount of time it takes for a driver to increase engine power after depressing the accelerator pedal. A faster throttle response means that the engine will respond more quickly to the accelerator pedal. This can improve acceleration, but it will not increase horsepower or torque.
The most skillful drivers can shift non-synchronous transmissions without using the clutch by bringing the engine to exactly the right RPM in neutral before attempting to complete a shift. If done improperly, it can damage or destroy a transmission. Some truck drivers use this technique with the higher gears.
Drum return springs (which pull the shoes away from the inside of the drums when the brakes are released) become worn, stretched or broken, which can cause the brakes to drag. Hold-down springs that keep the shoes against the backing plates can become corroded.
The process of manufacturing springs is fairly straightforward, with some variations based on the type of spring being made. In their most basic variation, springs are created via a process of winding, heat treating, grinding, coating and finishing.
When it does have a spring return, after pressure relief, the piston is retracted by spring force. The pressure spring must not only overcome the friction forces, but must also supply the hydraulic oil back to the reservoir.
A return statement ends the execution of a function, and returns control to the calling function. Execution resumes in the calling function at the point immediately following the call. A return statement can return a value to the calling function.
Increase Throttle Response with Aftermarket Throttle Bodies

More air volume and speed is a surefire way to increase horsepower and throttle response at any given RPM. It is easy to achieve this at high RPM when the engine sucks in substantial amounts of air on its own. But coming off idle is another story.

A push/pull throttle is a dual cable throttle operation where the pull cable opens the throttle plates, while the push cable, along with a throttle return spring, closes the throttle plates. The “push” cable is a misnomer as the push cable also pulls.
The throttle valve cable controls the line pressure, downshifting, and the shifting feel in the transmission. It can be adjusted to your preference.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Engine cycles high & low, does not run smooth
ANSWER : I think the gas needs to be changed or the carb needs to have the needle and float replaced. The gas may be just strong enough to fire but misses causing the high and low. If gunk gets built up on the float, then the float can’t be “floated” right to open up the needle so the right amount of gas is let in. Sometimes the carb, can be cleaned but it’s usually best to just buy a new float kit, which is $5-$7 here. You can also buy a new carb which is about $35. Just depends on where and how you want to do it. Good Luck

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Why would the engine idle at a very high rmp and the idle control seems to be function but has no effect on the rmp of the motor
ANSWER : Check to see that there is no binding or issues where the governor linkage and the throttle linkage interact with each other at the carburetor. Check to see if any of the springs are missing also.It will be evident if so, linkage falling down.

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How do i rewind the recoil spring on my craftsman lawn mower?
ANSWER : Normally these small engines use a clock spring to retract the rope.
Remove the cover on the top and you should find the spring either broken or the tab where the spring end has broken off or jumped out of the mount.
You will need to pre-load the spring with enough tension to retract the rope.
Remove the pull handle from the rope, load the spring and then wrap the rope around the pully holding the pully and spring in the loaded position. place the end of the rope through the hole and tie up the handle. The rope should pull and retract without being installed on the engine.
Best explained here…

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How do I replace the trigger on the Huskie 350? Does it just snap out, is there a pin to drive out or do I have to separate the case. If I have to separate the case, how?
ANSWER : To remove the the trigger there is a alloy pin that needs be be driven out. Before you can take the trigger out, you need to remove the trigger lock ( dead man ) to remove the trigger lock, gently pry the two halfs of the tank apart at the rear opening where the lock sits, this will allow the back end of the throttle lock to pop up, once up pull the throttle lock toward the rear of the saw and it will come away ( bayonet fitting in the tank ) the trigger will now come out with its spring once the pin is removed.

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How to install recoil spring – Husqvarna Chain Saw Chain 16"
ANSWER : Remove the starter cover, with the cover off remove the centre fixing screw in the plastic pulley, remove the pulley, be carful that the old spring does not fly out, new starter springs will be in a keeper, place the it into the cover make sure the looped end is located onto the anchor point in the cover, push home and take away the keeper, re fit the pulley and securing screw.

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Cannot get the recoil spring on model 18r back in housing!
ANSWER : If it goes into a metal housing that is like a can lid with short sides and has one area that is open onthe side and the whole thing has a small hole in the center of the flat side….Take the metal housing, lay it flat on a table or other flat surface. Figure which way the spring would go. Lay the small end of the spring in the housing with the spring wire going out the open slot. Now all you do is wind the spring in by turning the housing. You must keep the spring in the housing with your other hand, maybe a flat piece of wood or something to hold the spring from jumping out. Once you have it all in the housing, reinstall it. If the spring is backward, CAREFULLY pull the spring out until it is no longer under tension, flop the spring over and go again…Good luck…Lee

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Rpm maxes out and I can't bring it down – Craftsman 17.5 hp 42 in. Deck Lawn Tractor – CA Model
ANSWER : Check that throttle linkage is ok and free, check that throttle plate is free to move and not jammed – check that srew in the throttle plate is not allowing plate to restrict and jamb throttle

check the governor springs and links are in the correct places and are free to move , check that governor is working ?

if its not migght be governor is adjusted wrong or slipped
or its flown to peices

if unit is ohv model have seen the the ocilating balancer
torque link rod break and cause a engine to go to full throttle
as sson aas the engine was started

please let me know model and type numbers off the engine in question and its make ie briggs etc

and will try help further

cheers paul

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I have a craftman 4 cycle mini tiller, running to slow. need to run at a faster speed. do not where to adjust.
ANSWER : If the carb has the “fixed” throttle control. Find the governor control lever with the small, long coiled spring attatched to it in the middle. It may be hooked to a metal tab that is on the back carburetor bolt. Bend the tab to your left to increase set speed or to the right (towards governor lever) to decrease.

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