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Wont start - cleaned carb, checked gas and air filter, getting spark, fresh gas/mixture. Only used this a few times, was running ok then would not start next time , but ran ok the day before.

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  • McCulloch Master
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If there is a good spark, and fuel to the plug but still will not start, i would suspect piston damage, remove the muffler and check the condition of the piston through the exhaust port, any sign of damage and the saw will need to come apart to assess the damage.

Posted on May 29, 2011

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Posted on Jan 02, 2017

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Carb settings for Stihl FS160


Here's a link to your owner's manual,look at page 26 for carburetor adjustments,I have 3 stihl's,a blower,weedeater and chain saw,had them a long time,never had to adjust the carb.What problems are you having?Clean your air filter or replace it if's real dirty and can't get clean,use 50;1 regular unleaded gas and oil mixture,put a new plug in it,same as you were using,Autozone has them cheaper than the Stihl dealer.Are you using your choke and throttle correctly when starting?On mine,I set the throttle,lock it in,put choke on close,pull a few times,no more than 5,then open choke and pull,it should start,is your spark plug getting oil-gas on it,if so then your flooding it at start up,use fresh gas mixture.I wouldn't adjust the carb. https://www.stihlusa.com/WebContent/CMSFileLibrary/instructionmanuals/FS160_180_Manual.pdf

Jun 14, 2017 | Stihl Garden

1 Answer

I have been using my Husqvarna yth2348all summer now it wont start. There is spark and fuel going to carb. There was a huge mouse nest. Checked carb bowl it was clean. Any suggestions?


Hi Todd:
Here's a couple of things I would do.
1) See if there is a drain plug on the carb, If there is, drain it so that you will be getting fresh fuel into it.
2) Remove the air filter cover, then remove the air filter make sure it is clean. Replace if it's really bad.
3) Squirt a bit of fresh gas into the throat of the carb, put the air filter back in place, and try to start. Usually it will be good and run. If it doesn't, youre not getting spark. If it runs a bit and then dies, you're not getting gas. Try the prime trick a few times. If it still won't keep running you'll need to take the carb apart and clean it.

Nov 19, 2015 | Husqvarna Garden

2 Answers

Doodling 97cc baja, been sitting all winter. Won't start.... Spark ok, cleaned carb, fresh oil, still won't fire up... Not sure how to set the air/fuel mixture either....


The three primary things every engine needs is fuel, spark, and compression. For the few minutes it takes I always check compression, then eliminate the rest. A fast way is to attempt to start it with a shot of starting fluid. If it starts, you can assume you have decent spark, and the problem is fuel.
Speaking of fuel, avoid "oxygenated" gas (10% ethanol) LIKE THE PLAGUE. It just doesn't work.Is you spark nice blue clean consistent?
I use an old spark plug attached to a battery clamp, and set the wide (0.40+) If the ignition is strong enough to jump it, it's strong enough to fire under compression. Buy a new spark plug, a couple bucks eliminates that concern.
Air/fuel mixtures don't change much, and wouldn't lead to a starting problem. Get it started and running and then worry about that later.

Aug 01, 2014 | Motorcycles

1 Answer

17 hp briggs stratton ohc


Clean or change air filter. Clean, gap or change spark plug. Empty gas tank add fresh gas with Stabil. When spark plug is removed pull rope several times to blow out cylinder. Spray starter fluid in spark plug hole before replacing spark plug. Clean outside of carb so choke works freely. Spray starter fluid into carb breather hole with air filter removed and try to start. if running replace air filter and cover. If no start disassemble carb and clean. If no start replace carb.

Jun 19, 2013 | Garden

1 Answer

Engine cranks as it should but will not cut without lugging down to the point that blade stops. the only time it runs at high rpm is the few seconds before it runs out of gas. fuel line and filter both...


From the symptoms you are describing it is running too rich, start by cleaning the air filter, if this does not help check the spark arrestor in the muffler outlet ( if fitted ) if all else fails screw the the H jet in the carb in by 1/4 turn, this will lean the mixture.

Mar 25, 2011 | Garden

2 Answers

It will not start. It has not been used for over 2 years.


get some gum out clean out the gas tank and clean the flue pump and you are good

Dec 09, 2010 | Coleman Powermate Powermate 5000W...

1 Answer

I have a 78 honda it has been sitting, won't idle


The stock pilot screw setting is one and one half turns. The usual problem for not idling is that the slow speed circuits in the carbs are still plugged up. Secondary cause is usually that the carbs are not in sync > The carb slides don't all move upward at exactly the same moment. If you haven't installed new spark plugs, do it. Soak the carbs in denatured alcohol after removing the slides and float bowls. Finish with spray carb cleaner and compressed air. Spray into all the drill holes, ( circuits ), in each carb. Install an in-line fuel filter to prevent trash from the gas tank getting into the carbs.

Jul 04, 2010 | Honda CBX 750 F Motorcycles

1 Answer

Will not start has a spark,but a lot of fuel in the muffler cleaned the screen and emptied out fuel ..do I need to add new fuel ..carb cleaner ?


Yes, add fresh fuel. You may need to crank the engine while holding the throttle at wide open and no choke to start unitll excess fuel is burnt.

Overfuel or 'rich' condition
Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check Air filter for fuel saturation
4) Allow engine to run for 5 minutes to remove excess fuel from muffler
5) Fuel mixture ratio: Make sure the oil mix is per your manufactures recommendations
6) If after the above the engine is still smoking and blubbering:
Adjust carb mixture screws to a 'less rich' setting
*NOTE: only move mixture screws 1/8 of a turn at a time,
and try operation before any more adjustment

Nov 21, 2009 | Husqvarna 28cc Gas Line Trimmer

1 Answer

Leaf blower starts and runns ok for few mins then


Target your inspection towards the 'spark arrestor screen' in the outlet of the muffler.

Overfuel or 'rich' condition
Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check Air filter for fuel saturation
4) Allow engine to run for 5 minutes to excess fuel from muffler
5) Fuel mixture ratio: Make sure the oil mix is per your manufactures recommendations
6) If after the above the engine is still smoking and blubbering:
Adjust carb mixture screws to a 'less rich' setting
*NOTE: only move mixture screws 1/8 of a turn at a time,
and try operation before any more adjustment

Nov 13, 2009 | Craftsman Garden

3 Answers

Poulan 6.75 Lawn mower will not start


Remove spark plug, clean and dry. Replace plug. Remove air filter. Spray WD-40 into carb opening; one second blast. Turn over engine, (pull handle). Engine should start briefly and run for 3 seconds.  If not, you are not getting spark to spark plug. If engine starts, you have a dirty carb and you can buy a rebuild kit from manufacture.

May 02, 2009 | Poulan Pro " Pro" Self Propelled Mower

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