Sounds like your carb is plugged up with gunk. Will require a good cleaning OFF the engine. This includes running small diameter wire into the ports and bore holes in the carb to dislodge any gunk in them. You can use low pressure air to blow out the channels and hoes, even your breath will be enough, just blow through a straw or tube, or use WD40 with the red tube that comes with it to flush the channels. Make sure you keep track of all parts you remove!! Work on a tray or other containment surface.
Make it nice and clean and then reassemble and reinstal on engine.
Yes, your gut may be right on the fuel mixture. It may also be the piston rings are worn and need replaced. But you should definitely try the right fuel mixture first! Another way to back up the gut is to take the muffler off and look into the cylinder that way. If there is a lot of carbon build up in there, then you know that that is the problem. There will also be carbon build up in the muffler too.
Although you may not have the exact mower that is in the video, all of your smaller mowers are pretty much the same.
Good Luck with your project!
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If this engine has been sitting for awhile I would guess the carb. is gummed up and need a good cleaning. First thing I would do is try a fresh spark plug. Just because the plug looks good doesn't mean it is. If you have a fuel filter check this also. If it is getting fuel into the carb and has spark and compression I would remove the carb and clean it.
For PaperPro Prodigy. Best stapler I have used but after about 8 years the flat steel staple driver broke. To repair, remove the bottom by forcing it back, force the stapler halves apart with a flat screw driver and the top comes off. The springs and levers are on one half and they will not fly apart. I couldn't find the staple driver part (on the left) so go to the store and buy a new stapler.
Scaffolding systems require the use of many accessories. Base jacks, U-head jacks, fork heads and adjustable fork head jacks, v-pressings, c-cups and make up some of the necessary accessories of a scaffolding.
In all ro systems filtering sea-water or brackish water, there should be much more waste water than potable water produced. You didn't say if the system is producing potable water. If you can give more information about your inlet water and the quality of your potable water quality I may be able to help.