Question about Mtd 22" Yard Machine Push Mower

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I have a craftsman rotary lawn mower model 917.388190 and when I try to mow it runs ok than slows down.Can u tell me what is wrong with it ?

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  • Mtd Master
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Hi louise

Sounds like you have dirt/debris in your caburetor jets,fuel passages or a diaphgram that is becoming non-flexible.
Check/Clean/Replace your Air Filter, a dirty air filter can make your engine run to rich with fuel.
Note: ALWAYS USE COMPRESSED AIR TO CLEAN YOUR JETS AND PASSAGES, VERY IMPORTANT.
Note:Before you disassemble the carburetor:
Write down on a piece of paper and or take a picture of how the linkage attaches to your carburetor for later reference when you go to reinstall your carburetor.
Mark each piece with a awl, or some kind of sharp instrument that will make an alignment scratch before you disassemble the carburetor into separate pieces.
That way you will know which way it goes back together when you reassemble it.
Sometimes you can get by with priming the carburetor or by using a very small shot of starting fluid and letting it run a few times like that, and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Be sure to check your fuel tank for water and dirt/debris, if there is water/debris then you need to clean your tank.
Check you fuel line/s condition...after a while they will degrade and need replacement.
Check/Clean/Replace your fuel filter if you have one.
When you remove your fuel lines from the carburetor be sure to make a drawing or take a picture of how the lines are connected to the carburetor.
Also a good time to take a picture for later reference for reassembly.
If the mower is over a couple of years old, then I recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
The diaphgram may look good and flexible, but it can be deceiving and not act as a fuel pump as it should because it has become too hard and will cause hard starting,start and run and shut off, etc.
When you clean your carburetor, I recommend that you use a laquer thinner type cleaner to clean and dissolve the laquer build-up in the float and needle jet passages.
Be sure to remove all plastic and rubber parts before using the laquer thinner because it can dissolve the plastic parts and render them unuseable.
Be sure to use COMPRESSED AIR to blow out all the fuel and air passages.The higher air pressure is needed to blow some of the trash/debris from the fuel or air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Keep in mind that the float (if you have one) for the carburetor must be level when you go to reassemble the carburetor or follow the instructions you get with the carburetor kit, or you could also ask the parts man that you get your kit from.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their original position before you started.
Once you have your carburetor cleaned/rebuilt that should solve your problem.
Please take time to rate me
Bud

Posted on Oct 30, 2012

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SOURCE: lawn mower troubles

You must first remove the cover assembly which houses the starter pulley. Pull the old rope completely out until it no longer moves. Hold the starter pulley and remove the old rope. Try to wind the starter pulley spring tighter if possible. DON'T LET GO. The starter rewind spring must be wound before installing the new rope. After winding the spring, thread the new rope through the cover and into the hole in the pulley. Tie a good knot in the end and let the rope wind slowly into the housing. Once you have this done, replace the cover, get the proper length of rope, thread it through the handle, tie a knot in this end and your ready to go.

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SOURCE: nannie what can be wrong with my power devil

Check air filter, check screen in bottom of fuel tank,
New spark plug and also check the spark.
If there is a weak spark, the coil may need to be replaced.

If you have good spark, clean air filter, and clean fuel tank screen, then the carberator will need to be pulled of and cleaned out with solvent

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SOURCE: riding mower will barely move

Sounds like it time for a tuneup. Air filter changed, Spark plugs replace and oil changed, plus sharpen the blades while you are at it.

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clean or replace your air cleaner that will fix it,I hope this helps you?

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SOURCE: I can start the lawn mower but it will stall if I

First thing I would check is the air filter. Then the belt that drives the wheels. Open up the belt area and clean. Last I would check the carb. Good luck...Lee

Posted on May 28, 2010

Testimonial: "Great Job followed each suggestion & was able to mow the rest of the lawn...this guy knows his stuff !"

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