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Low speed circuit on carb is blocked. You can try using fresh fuel with some high quality cleaner added and run it through and see if it clear. Otherwise it means the carb has to be removed for cleaning. Which is especially hard these days with the EPA carb plugs on the mixing needles. These plugs are to minimize tampering by owners. You need to be a licensed shop with the tools to adjust the carbs and then put new tamper plugs on nowadays..
Many small carburator needles have plastic caps on them to limit how far they can be adjusted. If you need to go past their limited settings you'll have to break those caps off if you have them. Turn both the L and H needles in just to where they seat, not tight, then turn them out one full turn. Start the blower and let it warm up to operating temperature. With the motor idling, if necessary turn the L needle in or out to where it is idling smoothly. Turn it in until you notice the idle speed change or it starts running rough. Now turn it out, counting the turns, until you go past smooth idle and get to where it gets rough again. Turn it back in halfway and you're good on the L idle needle. For the H needle, hold the throttle at 3/4 full throttle and do the same thing to adjust the needle to half way between the rough running points.
Hi, Make sure your fuel /oil mix is correct, then, take a capfull of fuel and pour a few drops down the cylinder. After replacing the plug, give the starter a try. With fuel in the chamber and a confirmed spark, the engine has no choice but to fire. From here, you can determine if the idle adjustment needs to be changed.
Hope this helps.
That may be to keep dirt out. One of the screws should be for the richness setting and the other for the idle speed.
Adjust the richness setting so the tool runs the best (fast) then turn the idle speed down to normal.
Make sure you always keep the air filter cleaned or dirt will get into the carb and cause you to have to clean out the jets in the carb.
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!!.