small 2 stroke engine HELP!

[enzo1]

What about the coil? Mine idles fine ...

[cabmandone]

Try running it with the choke half on and see if it straightens out.

[cabmandone]

Originally Posted by enzo1

What about the coil? Mine idles fine ...

If it starts and idles fine but dies or almost dies when you give it fuel, I'm going with a fuel issue like a partially blocked main jet. As you're opening the throttle you're getting more air than fuel and going lean to a point where the engine dies or almost dies.

[asphaltgambler]

My experience: All of the remaining 2-stroke powered equipment being sold today are being tuned 'lean' from the factory to reduce emissions and smoke. That little carb has plastic 'limiters' on the mixture adjusting screws / low and high speed fuel circuits. Typically only allowing @1/2 turn either way.

They are installed by the factory to prevent 'Joe Consumer' from 'adjusting' the mixture out of range to the point of not running.

You are running lean on both. You'll need to first carefully turn counter-clockwise the low speed fuel mixture screw to the limit / limiter range. See if that cures the problem, because that is where you need it somewhat 'fat' when idling - so when you hit the throttle, the cylinder is loaded properly with fuel to accelerate as there is no accelerator pump shot.

If the mixture does not 'fatten' up enough - you can force it gently further by continued turning further which will break the limiter cap to get into the range you need.

Those screws should be clearly marked 'Lo' and 'Hi" - also do not confuse those with the idle speed screw which is a separate adjustment that does not have a limiter cap.

Any happy 2-stroke should emit a nice rolling, 'gurgling' sound at idle. Then instantly RPM when the throttle is hit WO. When held WOT and no load - there should also be a slight 'gurgling' that cleans up when a load is placed. If not, you'll need to adjust the 'Hi' speed mixture screw in the same way.

PM me with any questions past answered here if need be.

[Bill Douglas]

Originally Posted by asphaltgambler

on the mixture adjusting screws / low and high speed fuel circuits.

Yes, it's these I mentioned on my earlier post. The Husky people were trying to get it running to factory, low emission, spec's that just didn't work. I just turned them until it rev'ed like a, well like a small two stroke engine should.

[wdfifteen]

Originally Posted by enzo1

Also replaced filter in tank and lines ...its something else

Did you change the fuel tank vent? Try running it with the fuel cap loose.

[herr_oberst]

Make sure you replace all the fuel lines with alcohol/ethanol resistant hose while you're at it. Cheap insurance.

[Crowbob]

2-stroke engines smoke, even when the fuel is mixed correctly. That means exhaust gasses and particles get, well, exhausted through the spark arrestor as is on most 2-stroke engines on yardequipment. So when you throttle up the combusted air/smoke cannot exit and the engine acts like it's not getting air when actually it is not exhausting it.

After checking fuel lines, gaskets, spark plug, carb, air/fuel adjustments, pure gas, blah blah blah and it still acts like it's starving for air------clean the arrestor.

Or clean it first and avoid doing all that other stuff.

If it still doesn't work, give it to your son-in-law to mess with and then throw out eventually.

[DanielDudley]

Dump out your tank and start with all new fuel mix, fresh this week. Try running it without the air filter. Those new Stihl filters are made to clog. they won't blow out like the old ones would.

[Rednine11]

Mine was doing that. I took the carb apart and cleaned it up. Works fine now. I saw some yellowish looking build up in it from the crappy fuel we have now.

[cabmandone]

Turns out my brother was working on his friend's older Stihl BP blower that was having a similar issue. He cleaned the carb and adjusted and the thing ran fine for him but when his friend got it home it would run fine for a while and then start bogging down. His friend ended up buying a new blower. I almost wonder now if it might not be a coil issue were when it warms up from running it isn't losing resistance in the coil due to heat and then cutting out or not firing right?
I still think I'd try running it with the choke partly closed when it starts acting up to see if it clears. If it does clear that would indicate a lean situation meaning a plugged jet somewhere in the carb.

[flatbutt]

New carb on order.

[MBAtarga]

When my Echo blower acts up and bogs down like your symptom a brand new fuel filter has fixed the issue.


Sent from my iPhone using Tapatalk Pro

[cabmandone]

Keep us posted! I hope the new carb fixes it for you. I'm looking into buying some adjustment tools for my Husqvarna chainsaw, leaf blower and trimmer

[flatbutt]

Originally Posted by MBAtarga

When my Echo blower acts up and bogs down like your symptom a brand new fuel filter has fixed the issue.


Sent from my iPhone using Tapatalk Pro

Tks MB that was the first thing I checked, well the air filter first then the FF. Then following advice here I spent some time with the L and H screws but that didn't do anything. So I pulled the gas tank and the lines were "OK" but not great. Went on to the carb and found it to be ...well not to get too technical but it didn't look so very freakin' good. Ran over to my local chainsaw guy and he said the diaphragm was shot.

He also said that it looked like I had used old gas, which I had. He says that even if treated gasohol shouldn't be used if it's more than a month old. huh I didn't know that.