Question about Poulan Pro " Pro" Self Propelled Mower

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Throttle mechanism will not move.

The throttle mechanism on the engine will not budge. My daughter, who owns the mower said it suddenly started "acting up" and stopped working. It appears that she may have broken one of the plastic cable clamps trying to get the throttle linkage to move. I pulled the cable from the upper clamp and tried to pull the cable by hand and it wouldn't budge. I the disconnected the lower cable attachment. I then tried to manipulate the throttle mechanism with no cable at all and it still wouldn't budge. I even tapped on it with a small ball peen hammer, again with negative results. What can the problem be.

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Try 'break free' or any kind of penetrating spray around the throttle. Give it 15 min to soak in and try it again. Make sure you are pushing/tapping on the moving part and not the stationary piece. Should be another linage from there to the actual carb. Check that it is free and moving easily. Cable problems usually are inside the cabel,rust etc that binds the cable but you should be able to move the actuator w/a pliers with the cable unattached. Good luck

Posted on Apr 22, 2013


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Posted on Jan 02, 2017

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SOURCE: lawn mower engine stops while pushing

sounds like the float is set too low or you need to clean the carb.check the fuel filter and tank screen also.

Posted on Jul 29, 2009

  • 15 Answers

SOURCE: Mower blades locked

You may have broke the flywheel key. if that broke it will not start. The key is important for the proper ignition timing. They break so you dont damage the crankshaft. It may be a big job if you dont know your way around a small engine.

Posted on Apr 22, 2010

  • 1 Answer

SOURCE: Poulan 550 Series push mower won't pull start

Poulan 550 series self propeeled mower. Mower starts and stops running after 10 seconds. Gas tank full. Filter cleaned.

Posted on Sep 17, 2010

  • 16 Answers

SOURCE: I have a two year old Craftsman 650 series mower

Well you have done everything that there is to do. What did you set the gap between the new coil and the flywheel?
You may want to try the old plug to see if the new plug is bad. Would not be the first time that I have seen a new plug that was bad. Do you have a spark plug checker? It will show any spark as it jumps a gap.

Posted on Apr 25, 2011

  • 640 Answers

SOURCE: I apologize if this post sounds familiar. The

Two things likely happened, but one is real bad and I think that both probably happened here. The lesser of the two is a sheared flywheel key, which explains why it will not start. The greater is a bent shaft which is why it is so hard to turn even with the spark plug removed. To check for the bent shaft, remove the spark plug and tip the deck enough to get a good look at the blades and turn the blade. If there is a wobble of any kind then the shaft is bent. Also if the shaft is bent, with a push mower it is not cost effective to repair unless you are willing to do it yourself.

Posted on Aug 17, 2011

Testimonial: "Thanks for the advice. I will remove the flywheel and see whats there."

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1 Answer

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1- throttle cables stretch as they get older , if marking on throttle says "run" it might really be choke on carb - looking down carb body(air clean off) with engine off move throttle to choke the choke butterfly should shut off (choke does have small hole in it) the butterfly should not be just barely moving or half way it needs to be closed all the way
2- modern fuels leave deposits inside of carbs if machine is left to set for long times (weeks) these deposits don't just get washed away when the engine is started again either , they must be chemically or mechanically flushed away by either a carb cleaner (chemical) or taking carb apart and cleaning it totally out (inside and out) -these deposits cause poor carb performance and even non working engines
a method to keep from having to do this often , is to install a fuel shut off valve in the fuel tank ( might already have one there you just gotta look for it) and when your done with machine shut off the gas valve and allow it to run out of gas dry !

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I have A Scott Bonner lawn mower ,high performance,overhead cam, SX 4000, 4 stroke.I am finding it very difficult to start the cold mower every time I go to mow the lawn.It takes me about half an hour of...

Hi and welcome to FixYa, I am Kelly.

The symptoms you describe are typical of debris in the fuel bowl of the carb. I am going to assume for the moment that it is a similar to a Briggs and Stratton engine. Engine model type and serial information is what we work with to resolve engine problems regardless of the mower brand. I note you said it was a Scott Bonner SX4000 engine. I am also assuming that you have the 18 inch GreenKeeper like this one:$FILE/28045.pdf

I do not have access to Scott Bonner Engine parts or technical data but if you clean out the fuel float bowl and it is still hard to start then the choke function of the engine is not working. Your engine has a "Bowl drain" screw on the bottom of the carb float bowl for removing carb debris or water in addition to a bowl nut.

Most likely due to the throttle cable needing and adjustment so that the choke is closed when choke is selected. Adjustment of the throttle cable is as simple as losening the clamp screw (Do NOT remove it) on the side of the carb throttle control and moving the throttle to STOP then re-tightening the clamp retaining screw. This should allow your choke to move full closed when selected. You may have to experiment with full throttle and STOP throttle control positions with the clamp screw loose but not removed to see which position will give you full throttle, choke and STOP. After each adjustment you MUST tighten the clamp screw to test the throttle cable travel on the the throttle plate. Beleive it or not... the person that assemble the mower made the intial throttle adjustment. It may have never been tested before you got the mower.

If you still have problems.... this is the brief way to start an engine that has choke problems. Remove the spark plug and squirt a splash of gas into the spark plug hole and then re-install the spark plug. Just don't over-do the splash of gas and if your messy wipe off the excess so you do not start a fire. (This method always works but you occasionally foul a spark plug with too much gas)

Thanks for choosing FixYa,

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If it starts and runs fine, the first thing I would do is to check if the throttle cable sleeve has slipped where it connects to the carb. I have seen a few of these tractors where the cable was not tightened well enough and it slipped.
I don't have a picture of your actual motor. But here is a picture of the clip that holds your throttle cable tight. toolboxhero.jpgFollow the cable from the handle on your dash down to the motor. Find this clip on the side of the motor. Now: Move the throttle back and forth until you see how the cable moves the throttle mechanism. Does the cable extend to give the engine full throttle or shorten?
You want to move the cable so it gives the engine more throttle. I personally do this with the engine running but don't do this yourself unless you are comfortable doing so. So loosen the bolt and move it only about 1/8 inch at a time.
If you don't feel comfortable doing this call 1-800-4MY-HOME and have a Sears tech come out and work on it.
Let me know if you have any more questions.

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