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Masport 4 stroke mower...started it up and it worked for a couple minutes with a strange rattling growling noise.. Oil ok and petrol filled but the mower just shut it's self down and im not sure w

Lawn mower is over 15 years old

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  • matt_tethers
    matt_tethers Dec 03, 2012

    Spark plug is fine,mower turns over but it wont fire

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  • Master
  • 2,095 Answers

It will run for a few minutes and then shut down?
Lets ignore the growl for now. Loosen Gas cap and see if it will keep running. The rattle might be in the pull cord mechanism..possibly not related to stalling issue

Posted on Dec 11, 2012

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Posted on Jan 02, 2017

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SOURCE: Masport Lawnmower won't start

you likley will need a new air filter and a carb cleaning. when mowers are turned on their side. oil will seep past the piston and if your intake valve was open it can pass thru into the carb and also spoil your air filter. I am assumeing you have a paper air filter. start by taking off your air filter. then you should also pull the spark plug, place a rag covering the hole. then pull the cord a couple times. chances are that you will blow the oil out of the cylinder.

Posted on Mar 31, 2009

  • 9 Answers

SOURCE: Hi, I have a Masport 635 Lawn mower, I think it is

If it is two stroke it must have oil mixed in with it. Try pulling the cord and notice if there is any compression if not then it is the pistion and if it doesn't turn then it is seized with lack of oil.Now if it is four stroke take the plug out put it to the head and pull the cord to see if there is any spark if there is it's a fuel problem.

Posted on Feb 08, 2011

barterjoe
  • 338 Answers

SOURCE: My self propelled toro lawn mower starts fine but

I hope this helps:
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Posted on Apr 05, 2011

hunter19_46m
  • 7482 Answers

SOURCE: My Lawn mower seems to be produced by ALKO, but

Hi scottcoles5...
The easy way to find out if the motor is 2 or 4 cycle is to check to see if the engine has oil in the crankcase...if it does it is a 4 cycle and you will NOT have to mix oil with your gas. 2 cycle engines do NOT have an oil in the crancase and depend on the oil you mix with your gasoline.
You can also check the color of the gasoline in the tank, most 2 cycle oils contain a colorant to color the gas to let you know there is oil in the gas...
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Posted on May 31, 2011

hunter19_46m
  • 7482 Answers

SOURCE: I've inherited an older Victa 2 stroke 80 mower.

Hi anastasialou...

Sounds like you have dirt/debris in your carburetor jets,fuel passages or a diaphgram that is becoming non-flexible.
Be sure to check your fuel tank for water and dirt/debris, if there is water/debris then you need to clean your tank.
Also check you fuel line condition after a while they will degrade and need replacment.
Make sure you are getting spark at the spark plug, to do this:
Remove your spark plug and check to be sure you are getting fire at the spark plug.
You do this by grounding the plug on the head of the engine and pulling the crank rope, if you are getting spark then:
Check/Clean/Replace your fuel filter if you have one, normally they are located in the fuel tank of weedeaters.
When you remove your fuel lines from the carburetor be sure to make a drawing to how the lines are connected to the carburetor.
Normally the big line will be the line the fuel filter is connected to inside of the tank.The smaller of the two lines is the return to the fuel tank from the carburetor after it is pumped thru the carburetor by the primer bulb.
Also make sure you are using fresh fuel...and oil mix if your using a two cycle mower or weedeater with the oil to the right mixture and not too much oil as it can cause hard starting.
If the mower/weedeater 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.
Sounds like you will need to clean the carburetor or replace your carburetor internal rubber parts like the diaphgram and O rings.
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.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Sometimes you can get by with priming the carburetor or using 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.
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.
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 orginal position before you started.
Once you have your carburetor rebuilt that should solve your problem.
This is a FREE answer,Please take time to rate me

Posted on Jun 19, 2011

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