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Won't rev up

Stihl leaf blower won't rev up. Starts fine, idles, but won't rev up. Already changed the carb

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  • Master
  • 2,069 Answers

Check the Spark Arrester on the muffler. Usually an allen key to take off a section of muffler to get to it. It's a small Screen. They clog with soot and the engine cannot breath.

Posted on May 02, 2017

Testimonial: "This was the problem. This model needs a socket to remove the tube. Screen was plugged solid. Thanks. Runs like a champ again."

  • Bill bruno
    Bill bruno May 03, 2017

    That was the problem. This model has a tube that needs to be removed by a socket. Once you remove it the tubular screen was plugged solid. Used a penatrating product and a wire brush to clean the screen out. Runs like a champ again. Thanks so much.

  • wadingriver
    wadingriver May 04, 2017

    The screens that are part of the Muffler can be left off. If you can with your setup, next time it clogs, just leave it off. Just some Gov't Mandate that does nothing but cause the User grief. How many times does sparks shoot out and create a forest fire? like, never Glad I could help.

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6ya6ya
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SOURCE: Kill switch on Stihl BG 75 leaf blower not working

when engine cool,, spray wd 40 into the switch and work it a dozen or so times and clen it out

Posted on Aug 12, 2009

mickey813
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SOURCE: Poulan wild thing leaf blower won`t start. Has

SOUNDS LIKE YOU SHULD GET YOU A NEW ONE ITS CHEPER TO GET A NEW ONE

Posted on Sep 30, 2009

kel1guy2002
  • 3740 Answers

SOURCE: Stihl Hand Blower BG 55 Starts

Hi and welcome to FixYa, I am Kelly.

You should first expose the carburetor and clean it with carb cleaner as best you can.
- Then as you turn the L screw jet clockwise cound the number of turns it takes to just barely stop turning and then remove the screw.
- Spray carb cleaner into the hole and then reinstall the L screw by first turning it all the way clockwise closed and then back it off the number of turns it took to close it to begin with. (Should be 1 & 1/4 to 1& 1/2 turns)
- Next close the H screw clockwise counting the number of turns it takes to just stop turning. Remove the screw jet by rotating CCW and spray carb cleaner into the hole.
- Reinstall the H jet by rotating clockwise until it just stops. Then back it off the number of turns it took to originally close it.

TEST engine.
Start the engine and make sure it is warm.
- Increase engine speed slowly until at medium range speed than try full throttle. If you have any hesitation at all adjust the L screw until the hesitation with a rapid speed increase stops. i.e let it idle... mash the throttle it should NOT hesitate if the adjustment is correct.
- Run the engine at full throttle. Adjust the H screw until maximum RPM is reached.
- Re test for hesitation from idle to full speed with a rapid cycle of the throttle. Make another L screw adjustment if necessary to get rid of the hesitation.

The Walbro manual is here:
http://wem.walbro.com/distributors/servicemanuals/WZseries.pdf

The repair kit can be found here:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110668147195

I do NOT recommend changing the Welch plug if you buy the repair kit unless it is severely corroded.

If after all of the above it is still stalling out with a WOT you will need to search for damaged fuel lines from the fuel tank to the carb and inspect the fuel pick up tube inside the fuel tank.
Hard or cracked fuel lines can cause havoc. If you have a fuel shut off make sure that it is free of debris.

Given your original symptom of stalling out at high speed only... you should just have to clean and adjust the H screw jet. Screw Jet adjustment: CCW = more fuel CW less fuel. Make the CCW adjustment until you obtain max RPM. Then check for hesitation from idle to MAX. If it hesitates... adjust the L screw turning not more than 1/8 th turn each adjustment until the hesitation from IDLE to MAX is gone.

Thanks for choosing FixYa.
Kelly

Posted on Apr 09, 2011

  • 41 Answers

SOURCE: Stihl BR600 leaf blower starts but won't make

Check the air filter and clean or replace if needed. Clean or replace the spark plug. Check the in-tank filter as well (located in the tank attached to a freely moving fuel line) Also, the Stihl 2-stroke machines have a spark arrestor screen located at the outflow port of the muffler, either in the form of a bolt nozzle, or screen plate. Remove that screen and clean it or replace it if its dirty. Clogged exaust is a typical problem! All of these things are VERY easy to do, good luck!

Posted on Sep 26, 2011

gobarnto
  • 3 Answers

SOURCE: I have a new Stihl FS90R Trimmer...Idles fine but

My nephew had a problem with his Stihl FS55R trimmer, sez it would run on high for a few then quit. Sez it restarts easy and runs on idle with no problem. I pulled carb & found fuel screen full of fine contaminant. This is the screen you see when you drop the bottom pan of the carb. (single screw does it). Reassembled and the trimmer runs on high speed w/o problems. If your primer bulb doesn't pop right back up when you punch it down, it means that the fuel can't get past that screen....

Posted on Apr 04, 2012

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I have a blower/vac made by McCulloch that won't start! I tore the carb apart & cleaned it! Got it started but w n rev up! Turned I&H screws all t w in & bk out now won't start! help!


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McCulloch won t start Leaf Blowers Questions & Answers ...

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McCulloch leaf blowers won t start related questions and answers. Ask your McCulloch questions. Get free help from leaf blower experts.

Nov 07, 2015 | McCulloch Garden

1 Answer

Stihl BG 72 blower starts and idles fine, but when I give it more gas its power and speed variate. Will not maintain steady speed.


Did you check the seal between the carburettor manifold and the cylinder? Could also be a fuel starvation problem, fuel tap, pinched lines, stuck carb float.

Nov 06, 2015 | Garden

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Blower starts fine and idles ok but will not rev up and seems to bog down


That is symptom of a lean condition. Check fuel filter and be sure you have fresh fuel. Carb may need to be adjusted or rebuilt

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Stihl BG55 blower idles fine but when you give it throttle it starts to rev up but then dies?


first you need to let it warm up. one minute. it is 2 stroke. most common issue is too much oil in fuel. mix ratio exact. make sure no water in fuel

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Km90 starts but won't run on full revs


The KM90 is a 4mix engine that has valves. You may need to check the valve clearance, using the clearance tool.

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1 Answer

My toro snowblower keeps stalling. It starts up fine, but won't run continuously.


If you haven't already, dump out gas and put fresh in it and try this, if it doesn't work you will have to clean the carb, take it apart and clean all jets ports etc and put back together and you should be Good to Blow Snow, pretty common problem with Small Engines that set half the season.

Dec 04, 2011 | Garden

1 Answer

Stihl BR600 leaf blower starts but won't make any power. This blower was bought brand new in 2009 I think. I haven't really done anything to it and it has always ran great. I have always used the...


Check the air filter and clean or replace if needed. Clean or replace the spark plug. Check the in-tank filter as well (located in the tank attached to a freely moving fuel line) Also, the Stihl 2-stroke machines have a spark arrestor screen located at the outflow port of the muffler, either in the form of a bolt nozzle, or screen plate. Remove that screen and clean it or replace it if its dirty. Clogged exaust is a typical problem! All of these things are VERY easy to do, good luck!

Sep 26, 2011 | Garden

2 Answers

My Stihl leaf blower starts fine but wants to cut off when I pull the trigger. This problem started out of the blue and gave no prior indication that anything was wrong. I cleaned the air filter and...


first thing is to throw out that ngk plug and install a bosch wsr6f the ngk plug works fine in rev-limit engines,

on to the bogging issue, im assuming its a bg 85 or therebouts? with a zama carb, if so then depending on when it was purchased it might be a warranty due to faulty welch plugs inside the carb.

if the welch plugs have fallen out you might as well replace the carb, in my 20 years exp servicing stihl equipment i have never been able to reinstall the welch plugs with any success.

the fuel to oil ratio is 50:1 or 3.2oz of oil per gallon......dave i wish u the best of luck hope this steers you down the right path.

Nov 21, 2009 | Garden

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