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Try removing the needle from the carburetor and soaking it in brake fluid (and any other parts that may look suspicious) over night; clean and regap or replace spark plug; ...also, try using high test fuel.... this runs cleaner on my Toro826.
Shuts off -I would look for a bare place on the spark plug wire. Slows down and stops under load (snow) then check for a bind in the throttle linkage. The govenor is not opening the throttle as the engine slows down.
if it's still under warranty, a toro dealer will do an over the counter exchange. or you can call customer service and they might ship you a new one. if it out of warranty than your better off buying a new one.
If this is a brand new mower you could take it to the shop where you purchased it. I will say that newer units are set to run pretty lean to meet emission standards and may surge a bit when not under a load. You could take a look at the carb and see if there are any adjustment screws visible. A minor turn with a screwdriver may solve your problem, probably turn the screw out about 1/4 turn or so, just until the surging stops. Many of the new machines today do not have any owner adjustable parts. If you don't feel comfortable trying this, please supply a model number off the mower and more info might be available.
You have carburetor problems. Chances are the diaphragm needs to be changed and the carb. needs a good cleaning. If you need tips on carb. cleaning, let me know.
Sounds like your carburetor needs to be cleaned out. The surging is usually a sign of running to lean (not getting enough gas) because of possible water, rust, gum, varnish or trash in your carb. Hope that helps.....
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