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Hi i have a mountfield rv40.Not been used for a while.put fresch fuel in it, started it up fine but cut out after few secondsanyone help me?have checked fuel for tank to carbhave taken carb apart and cleaned by handseems to me there is not enough fuel getting to engine?help anyone?

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  • Expert
  • 337 Answers

Tom Make sure that the gaskets on the carb are back good and tight. They may be worn due to taking it apart. The engine sucks the fuel through with the vac seal caused by the piston drawing. If the carb 'o'ring is not seated right it wont create a proper seal.

Posted on Jul 20, 2013

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Posted on Jan 02, 2017

moretons
  • 155 Answers

SOURCE: 7.0 hp OHV Platinum Plus engine on a power washer

If you can get the carby bowl off the main jet is up the centre sounds like its blocked there should be a model type and code on the engine cowl or on the rocker cover you can look up an exploded view on a site called pats small engines

Posted on Jul 27, 2009

redbeard00
  • 957 Answers

SOURCE: my cub cadet tank stops running 5-20 minuts after

Yes you may need a carb kit. It is not good practice to by-pass the fuel filter. The orifice in the jet is very small.
But anyways, There Could still be a blockage inside the carb, a small leak at the manifold, or the jet is worn out.
Let me know how it goes.

Posted on Apr 28, 2010

rycgl
  • 1545 Answers

SOURCE: AH520 Tecumseh engine will not start; no spark to

I would recommend a serious carburetor cleaning or even installing a new rebuild kit after the machine setting up for so long. The spark problem must be checked for either the (magneto to flywheel air gap) or the condition of the electrical points and condensor on it (if this older model has them)

Posted on Sep 20, 2010

hunter19_46m
  • 7482 Answers

SOURCE: After start up engine sputters and dies within 5

Hi global204...

Sounds like you have dirt/debris in your caburetor jets,fuel passages or a diaphgram that is becoming non-flexible.
Be sure to Check/Clean/Replace your Air Filter, a dirty air filter can make your engine run to rich with fuel.
NOTE: Before you disassemble the carburetor:
Make sure you mark each piece with a awl, or some kind of sharp instrument that will make an alignment scratch before you dissemble the carburetor into separate pieces.
That way you will know which way it goes back together when you reassemble it.
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.
Also make sure you are using fresh fuel
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.
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 original 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 27, 2011

juliefarley
  • 17 Answers

SOURCE: 1997 Mountfield 21" Emporer Petrol

check the FUEL plug. when unscrewing the fuel bowl it is the nut holding the bowl on. It sounds like it may be clogged

Posted on Jul 18, 2011

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