Stihl blower - full throttle it stalls out. low speed ok. have replaced fuel line, spark plug.

It is a fuel / air problem. Do you have a primer bulb, did you replace it and put it in the right way around arrow to the carb? It is a known issue. There are lots of help online and there are some videos below..

I have a stihl model bg 55 blower it starts fine runs for 5 ...

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Stihl Blower BG55 Bogs Down - Arborist Site

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Dec 5, 2013 - It I lock it on full run eventually it works itself out within 10-20 seconds. Since it never lasts long I have always put up with it, until now.

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Blower: Runs For A While Then Dies

eReplacementParts.com https://www.ereplacementparts.com > lawn-equipment
If your blower runs for a while then dies, you'll need to check the fuel filters, spark plugs, and more. Our troubleshooting and repair guide can help.

Stihl BG55 Blower Problem!!! - Lawn Care Forum

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May 1, 2008 - After the first couple minutes of running, the blower will normally bog down briefly and then I let off the throttle. Once I reapply the ...

Missing: stalls ‎' Show results with: stalls

Stihl leaf blower- running problem

The Garage Journal https://www.garagejournal.com > forum > threads > sti...
Nov 12, 2009 - I have a BG 55 when fuel tank gets down to 1/2 empty it stalls out. ... run, it revs up to max then dies completely. It will only start on full ...

Air fuel mix screws need adjusting

Here is the parts manual, incase you didn't have it.
http://www.mediafire.com/download/1dr01bcdwhik7im

have you checked the exhaust.?? If the Muffler is blocked then it will hinder the running of the machine as the exhaust gasses wont be able to escape. Check it isn't 'carboned' up and that the exit of the muffler isn't damaged. I've had it on Stihl engine where the exit on the exhaust was dented in, hindering the flow of exhaust gassed.

If you find useful, please click the 'helpful' tab. thank you

With 2 strokes I always start with 'AIR' 'FUEL' 'SPARK' from the sounds of it the choke might be stuck on (choking the motor ha ha) also check the air filter, You have fuel and its moving through but the fuel filter might be slightly clogged. As its starting and going on low your spark unit is ok but you might need a new spark plug.

Disconnect the spark plug wire from the spark plug and ensure it can't come in contact with the spark plug. Removal of the spark plug wire removes any possibility that power can be supplied to the engine of the blower during the repair.

Remove the screws that hold the air filter cover in place. Remove the air filter cover and air filter. Remove the air filter housing from the side of the machine. Removal of these components allows you access to the primer bulb, fuel line and carburetor.
Repair Procedures for Stihl BR600 Backpack Blower Primer

dump the fuel --clean air filter-change spark plug-- use new fuel synthetic 2 cycle oil--93 octane

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/david_2f6e03df6c124197

the read valve at the head end of intake manifold needs replaced

Could be Excessive carbon build up in exhaust caused problem. Remove muffler and clean exhaust side of cylinder.

Check and make sure the exhaust outlet is totally open. If it has a metal gauze screen slide it out and wash with carby cleaner and replace.
Blocked exhausts are common problem in 2 stroke engines because users run the motor too slow and it ( + oily residue) carbons up the exhaust. With a blocked exhaust, usually the moror will start and idle pretty ok but will screw up when you try to run at full revs.

In Australia we get mud wasps building nests in there - a quick poke out of the mud and she's running full throttle again.

ps. Don't fiddle with the 2 mixture screws - unless your know what you are doing. You will only make it worse!!.

If you have the TB2BP EC Troybilt backpack and it bogs down or begins to stall out at full throttle with choke in FULL OPEN try the following:
1. Do the simple stuff first, Check spark plug, air filter and clean or replace if necessary.
2. Remove air filter cover, open choke and spray out the carb with carb cleaner.
3. Inspect carb and look for a flat surfaced screw with a small V notch on the side of it. It will be on the top side just forward of where the fuel lines connect. If you find it don't waste any more time looking for the High and Low fuel adjustment screws (there aren't any) this is the only adjustment other than the throttle adjustment screw you'll find.
4. Start your blower allow time for it to warm up and advance choke as far open as you can without stalling motor (mine just suddenly wouldn't run in anything other than full choke).
5. With motor running, adjust the screw to improve operation. Depending on your initial choke setting you may have to adjust, open choke to next position and fine tune.
6. Note- clockwise reduces fuel to carb, while counter clockwise increases it (if it's stalling when you attempt to throttle up it's starved for fuel) I'm sure there's a tool designed so that some tech can charge you 100.00 to turn the adjustment screw 1/4 turn but I found that a pair of fine needle nose pliers did just fine. Pay attention to original position of the V notch and what adjustments you make ( I tend to make 1/4 turns and fine tune from there) so you can always go back to your starting point. Note I'm not a technician so I can't say this the fix for your machine but it worked on mine.