Question about Husqvarna 16" 457cc Prosumer Chain Saw 445

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New saw idles great, but when i give it gas it stalls out

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MAKE SURE WHEN YOU START A JOB YOU NEED TO PULL THE UPPER BAR TOWARDS YOU IN ORDER TO RELEASE THE CARB CHOKE SENSOR.WHEN YOU DO A COLD START THE UPPER BAR GO TO THE FRONT POSITION TO WARM IT UP OR STOP SAW JOB.

Posted on Nov 09, 2010

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Posted on Jan 02, 2017

hunter19_46m
  • 7482 Answers

SOURCE: saw stalls on giving it gas but idles ok

Hi ifwas...

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:
Mark each piece with a awl, or some kind of 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 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 condition after a while they will degrade and need replacment.
Check/Clean/Replace your fuel filter if you have one, normally they are located in the fuel tank of most chainsaws.
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.
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 chainsaw 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.
Note:
The little spring inside of the carburetor goes under the float arm.
That is where your fuel inlet needle/float valve is located...on the arm at the end.
Normally there is a small indetion in the carburetor base and a small protrusion on the underneath of the float arm where the spring will be in the right postion for installation.
The spring will set in the indention and you will install the float arm with the needle/float valve and float rod into position over top of the spring,you will push down until it is in position and then you can tighten the screw that holds the float arm assembly in position.
Once you have your carburetor cleaned/rebuilt that should solve your problem.
Please take time to rate me

Posted on Sep 06, 2011

  • 211 Answers

SOURCE: husqvarna chain saw stalls

hi charlier 421

I think the small holes from the Venturi wall of the carb are clogged.To clean them you need carb disassembly.Near the needle there is a tehnological cover,under the diafragm(fuel pump).Taking off it you will see some small holes maiking conection with Venturi wall.Used ompresed air to clean them.
best wishes savumihai71

Posted on Dec 01, 2008

  • 173 Answers

SOURCE: hi , my saw starts

It sounds like you are going to have to rebuild the carb or replace with new one.

Posted on Nov 24, 2010

Testimonial: "i decided to take apart the carb i dint have a carb kit accessible so did a good cleaning and put it back together .. i t now runs great .. thanks for putting me in the right direction ... cheers."

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