Question about Garden

1 Answer

525 jonsered chainsaw, wont run unless, fuel is dropped down the head, stays going for a few seconds, then shuts off. Just cleaned the carb top to bottom and it is the same as before, blew out all the jets and is spotless inside and out but still the same. Replaced all lines including gas line, carb is sucking gas, and the gas tank is clean and full so I dont know what else that it could be. If you have any help it would be great. Thanks

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 409 Answers

How is the compression on the saw? I see 2 possibilities 1 bad reed valves, or 2 a scored piston and cylinder. To check the reed valves, take the air filter off, and pull the starter rope, listen to see if air is blowing back out of the carb if it is the reed valve is broken or has something lodged in it. As far as the piston and cylinder, you can pull the muffler off and look in thru the exhaust port, what you see should be shiny and slick, if there are any vertical lines in the cylinder, or on the piston it is time for a new top end.

Posted on Mar 31, 2014

  • Evan Milley
    Evan Milley Mar 31, 2014

    It got lots of compression I already looked at the piston through the exhaust side and it looks brand new im unsure if it even has reed valves bacause I had the carb boot and everything off on that side of the engine and there was nothing between the piston and the boot just a gap for gas to flow

  • jimmy Mar 31, 2014

    Have you looked at the crankshaft seals, if they leak it cant push the gas to the top of the piston. One on each end of crank,


5 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 97 Answers

SOURCE: fuel line routing help.

You should have one line (with filter) going to the carb inlet & one line going to the bulb then back to the tank.

Posted on Mar 17, 2009

  • 1 Answer

SOURCE: McCulloch,Mac 3200 Chainsaw fuel lines...........

retgmdI need the same, did you ever find one?

Posted on May 27, 2010

  • 5603 Answers

SOURCE: poulan 2000 starts but wont

Two common things are a clogged filter which is usually on the end of the "fuel finder" hose within the fuel tank snd the other common problem is failure of the fuel pump and or check valves. The latter is in the carb and consists of a small diaphram that is driven by vacuum pulses picked off a port in the carb. The check valves of the pump are jsut little flaps. The fuel pump problem is most likely if you have always used clean gas. The fuel pump diaphram seem to be good for about 2 years then it is carb rebuild time. It takes less than an hour to rebuild with new kit. Try not to disturb adjustments and idling screws.

Posted on Oct 22, 2010

  • 391 Answers

SOURCE: my husqvarna 350 chainsaw starts but wont stay running for more than a few seconds


Find the gas/air adjustment screws on the carb (next to the the throttle cam where the throttle cable attaches. Turn the screws in all the way... GENTLY... Those are needle valves, and too much torque on them will damage the needle valve seats. turn both of them out one and a quarter to one and a half turns. Start the saw, and adjust one or the other screw in or out until the saw runs properly. If there is a plastic stop installed on the screws, remove it first, and replace it after the saw is running properly. You have to be patient while tuning the carb as it may take a while. If you adjust too much and the saw refuses to start at all, start over with the 1-1/4 to 1-1/2 turns out on the screws.

Posted on Aug 19, 2012

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Jonsered 525 chainsaw schematic

Was carburetor cleaner used to blow through the fuel circuits?

Small engine carburetors have tiny polymer or woven Teflon discs that move back and forth within the check valve(s). Carburetor cleaners or dip solutions are not intended for this type of component. The only approved cleaner that I have heard about is non-flammable brake cleaner, like Brakleen. Stihl's tech department recommends this approach to prevent damage to soft components of the fuel system.

It sounds like you are seeing fuel in the metering chamber, so the likely fault is a check valve, especially since this saw may be approaching 30 years of age. It is also important that the impulse passage/line is pulsing properly.

If there is a tiny hole in the intake that matches a hole in the gasket and carburetor, this is an impulse passage. Remove the carburetor, place a drop of oil on the hole in the intake, and turn over the engine. It should draw and expel the oil as this is attempted a few times. I'm not familiar with your saw, but some designs have an impulse hose that attaches to the carburetor's pump cover. I seriously doubt this is what you have, but it can also be checked using a few drops of oil.

The alternation of positive and negative impulses moves the metering diaphragm back and forth, allowing fuel to enter the metering chamber. If the impulse is weak, it may enter too slowly for the engine to fire. If the impulse can be seen repeatedly with the test above, it should be fine to operate the carburetor.

Next, the high speed nozzle needs to be checked with brake cleaner. It should allow a large stream to be blown into the throat of the carburetor from the metering chamber (if the high speed nozzle has a visible hole on top) or by removing the high speed mixture screw and spraying into the seat. It should not allow any cleaner to be blown the opposite direction. This can be tested any most Zama and Walbro carburetors by bending the red nozzle that comes with the cleaner. I usually feed it through the hole in the center of the fuel pump side until it touches the nozzle's outlet.

If the nozzle fails either test, it needs to be punched into the bore to remove it. A new one is simply oiled and punched into place at the same height, but finding this one may be tough. I was unable to find any information about this saw in a quick search.

The carburetor will probably have a model number stamped into it, and that will help to find if parts are still available.

Mar 28, 2014 | Garden

1 Answer

Will not stay running

Not adjusted properly.

Dec 29, 2013 | Homelite Garden

2 Answers

2003 volvo s40

worn fuel pump / low fuel pressure / engine management fault ?

Dec 23, 2013 | Cars & Trucks

1 Answer

2001 yz 125 wont start

is fuel freely flowing to the carb i.e. is fuel tap blocked

Mar 12, 2013 | Motorcycles

2 Answers

Fuel problem with John Deere 23hp engine

time to pull the hose off the fuel pump coming from the tank and drain the tank and check flow of gas coming from tank hose, and possibly inline fuel filter is plugged or there is junk in your tank/line from tank not letting enough fuel to run to pump so pump can pump it to carb !

May 15, 2012 | Briggs & Stratton Briggs Stratton...

1 Answer

Older (early80s) 80cc jonesred wont stay started, It runs for a few seconds after i pull the recoil and only with the choke open the it stalls out

Fuel starvation, replace the filter in the fuel tank, check the fuel hose up to the tank for signs of leaks or cracks, if no better it will need a carb service, and clean the internal carb filter, as it is an old saw new diaphrams will probably be required.

Oct 05, 2011 | Garden

1 Answer

Saw starts, wont stay running unless throttling then bogs and dies. changed pluge, gas, cleaned tiny screen in carb, checked diaphrams.


check the fuel pump(not to be tired)inside the carb.the carb could be out of adjustment

regards savumihai71

Oct 29, 2010 | Husqvarna "Chain Saw - 16" Bar, 3 Hp

1 Answer

Jonsered 2171 no gas going to carb. Put gas in carb run for few sec's. Blew out fuel filter seems to be fine. Not much use on saw.

the reason is you need to clean out the carb,if they dont get used much the oil/gas mixture turns to a varnish in the small carb ports and fuel can no longer get thru the carb

Mar 28, 2010 | Garden

1 Answer

Cleaned the carb put new caskets and fuel filter and tank vent but still isn't getting fuel

probably has a bad diaphram in carb, common problem go get a repair kit and try that.
also make sure the exaust isnt plugged up it wont start if it is and it mimicks a no fuel problem

Mar 20, 2010 | Standard Oregon Chainsaw Chain For...

2 Answers

Stihl 050av Chainsaw run problem

Check the filter inside the fuel tank
Check the fuel line for cracks or holes
Clean the carb

If still not working,replace the pump diaphragm on the carb

Feb 07, 2009 | Husqvarna Garden

Not finding what you are looking for?
Garden Logo

Related Topics:

77 people viewed this question

Ask a Question

Usually answered in minutes!

Top Garden Experts

Dennis Key
Dennis Key

Level 3 Expert

2478 Answers

john h

Level 3 Expert

12104 Answers


Level 3 Expert

75822 Answers

Are you a Garden Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides