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Join Date: Nov 2002
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small 2 stroke engine HELP!

I've about had it with this leaf blower. It's a Stihl, not top o' the line but a good one. I run premium gas using the Stihl label oil at 50:1. Sometimes it runs great, more often not so much. 1 of 2 things happens that I cannot figure. 1) it starts and idles fine but won't take fuel without bogging (fuel filter/air filter OK) 2)starts and runs fine for awhile then starts to bog. Close the throttle the idle stabilizes but won't take fuel and bogs. The shop I bought it from says nothing wrong with it.

WTF? Any ideas guys? I'm ready to go get a cheap corded one,(but I'll need 200 ft of cord)

edit: forgot to mention I don't squat about these type of carbs but ready to hear about jets and such
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Old 11-04-2017, 03:43 PM
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Make sure you have a new spark plug. My Stihl chainsaw seems lately to go through plugs as quick as my 911 can burn up a brazilian bosch coil. It gives weird running symptoms and then suddenly craps out. Lately- and maybe it's just me, the plugs just don't last. Everything else stihl... strong like ox.

On my "lesser" blowers, the diaphragms on the carbs get trashed by the ethanol gas. All they need to do is stretch ever so slightly. At least on the other brands- they don't even sell the gaskets, you just buy the whole carb to replace. Cheap pieces of crap.

edit- "lesser" brand = "TOY BUILT" I think also I have a "TORO" blower, but I can't remember. Ever since I bought "Stihl" Blower, weedeater, and Chainsaw... I have never looked back. Like they say, the most expensive tool you can buy is a cheap one since you will have to start over and replace it with a quality one later.

Last edited by LEAKYSEALS951; 11-04-2017 at 04:23 PM..
Old 11-04-2017, 03:54 PM
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didn't think of the plug, I'll check that. tks!
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'99R1100SA DDP of course
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'10 M696 gone as down payment for '12
Old bikers don't get old by accident
equito ergo sum
Old 11-04-2017, 04:01 PM
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Make sure choke is opening fully when warmed up.. Not sure which model you have, but some have a cold start position on the idle switch... You can run it without the airbox on and look inside the carb opening
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Old 11-04-2017, 04:02 PM
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Quote:
Originally Posted by rattlsnak View Post
Make sure choke is opening fully when warmed up.. Not sure which model you have, but some have a cold start position on the idle switch... You can run it without the airbox on and look inside the carb opening
another good one, thanks!
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'10 M696 gone as down payment for '12
Old bikers don't get old by accident
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Old 11-04-2017, 04:22 PM
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If it has a spark arrestor on it clean it. Brake cleaner works.
Old 11-04-2017, 04:33 PM
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Quote:
Originally Posted by Crowbob View Post
If it has a spark arrestor on it clean it. Brake cleaner works.
Yes, it's a screen between the exhaust port and muffler. Gets clogged. I bought a good John Deere weed-eater for $10 at a yard sale and that's the only reason it didn't run.

Also, if left sitting with fuel in it, clean the carb. Idle jet and pilot jet get clogged. The "bog" is a sign it's running lean and not getting fuel....G'luck....
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Old 11-04-2017, 05:10 PM
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Quote:
Originally Posted by LakeCleElum View Post
The "bog" is a sign it's running lean and not getting fuel....G'luck....
Yep. They always do this when cold. If it does it when it's warm it's a sign of a lean mixture. ie restricted fuel flow.
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Old 11-04-2017, 05:22 PM
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Disclaimer: I'm not saying this is what it is. But it's worth a thought.

My Husqvarna weedeater was always a bit crappy. Then it went from bad to worse and I took it into the Husqvarna people for them to sort it. It was in and out of the shop about 3 or 4 times then they offered a big discount on another brand. I asked for one of their tuning screwdrivers and then found the shop's tuning was WAY out. Sure it doesn't idle but it's got way more revs, doesn't bog and die (just like your one is doing), and a LOT more power
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Old 11-04-2017, 05:30 PM
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Check the fuel line and return line for a obstruction. A buddy had a small piece of wood in his gas tank occasionally it would block one of the lines and cause running problems.
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Old 11-04-2017, 07:00 PM
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If you can, buy NO ALCOHOL premium gas. My small engines, 2 and 4 stroke both, run terribly on gasohol. Luckily, I can buy 92 octane no booze gas here...
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Old 11-04-2017, 08:30 PM
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Replace the carburetor
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Old 11-05-2017, 04:37 AM
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I have a bunch of Stil stuff...my weed eater is over 23 years old! Used it yeserday for over an hour. I do buy the Stil premixed, no alcohol, 93 octane gas at the dealer. Expensive but I've had no issues across the fleet since.

Check the primer bulb. They do deteriorate and can cause air leaks and "bog" at high revs.

Easy fix. I have a bag of them

Edit: FastFred is right. I have replaced carbs as well if the simple fixes don't work. Not worth the bug hunt. I just replaced one on a 25 year old mantis rotor-tiller: $45 online.
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Last edited by Seahawk; 11-05-2017 at 04:49 AM..
Old 11-05-2017, 04:43 AM
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I am guessing it has one of those small Zama square carburetors. My buddy owns a husqvarna dealership. He says their success rate was low , with cleaning the carburetors on the smaller equipment. They even had an ultrasonic cleaner, just the, passages are super small, and sometimes impossible to clear out.
Ive had similar experiences . Had a few that I just could not make run right, even after several carb rebuilds. Bought new, and no problems . they are pretty cheap, usually only about $40
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Last edited by fastfredracing; 11-05-2017 at 05:45 AM..
Old 11-05-2017, 04:46 AM
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Quote:
Originally Posted by fastfredracing View Post
Replace the carburetor
That's been my experience with 2 strokers. Once the carb. gets gummed up they will
generally start OK but won't take fuel unless running 1/2 choked. Never had any luck cleaning the carbs, just much easier to replace them.

and those square Zama carbs Fastfred mentions run $20-25 on the internet (or the last time I bought one anyway).
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Last edited by 74-911; 11-05-2017 at 04:53 AM..
Old 11-05-2017, 04:50 AM
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I haven't read all the replies but is it acting up on a full tank of fuel. These lines develop cracks and once the fuel level gets lower it can't pull fuel. Had this happen in a weed eater and a backpack blower. Also, the in tank fuel filter should probably be replaced if you're having a fuel issue.

Last edited by cabmando; 11-05-2017 at 04:56 AM..
Old 11-05-2017, 04:54 AM
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happens on a full tank, new fuel filter, new fuel line(in the tank). lots of learning opportunities from youse guys, thanks much!
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Old 11-05-2017, 06:45 AM
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Sound like you are at the "replace the carburetor" stage. Before you replace it, take the old one off and check the gasket for leaks. It might be as simple as a loose carburetor or a bad gasket. Homelites had a flexible connection between the crankcase and the carb to minimize vibrating the carb.
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Old 11-05-2017, 07:11 AM
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I'm having the same problems flatbutt is ...I went the "replace carb" route . no bueno. Can't figure it out. If you figure it out, let us know!
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Old 11-05-2017, 09:39 AM
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Also replaced filter in tank and lines ...its something else
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Old 11-05-2017, 09:40 AM
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