Sounds like the adjustments need to be worked on outside the carb. If they are dry put a little bit of light oil or even WD40 on all the moving parts on the carb. Sometimes they just get dry and a little rusty from sitting.
SOURCE: toro 421 snowblower won't start
check to see if in line fuel shut off valve is open.If so,sounds like carb is gummed up.
SOURCE: i have a toro ccr 3650 snowblower the electric start just grinds
This problem has been solved! I took the covers off the machine, removed the starter and eventually replaced the drive. Apparently the drive parts were put on back ordered and took about 4 weeks to get the drive set. One thing I suggest if anyone does this is to look at the fly wheel to insure it's in good working order. The dealer I worked with said often that is chewed up (the teeth on the fly wheel) and leads to a bigger headache. Fortunately mine was just fine. The machine now works likes like new as I put in a new spark plug as well!
SOURCE: toro recycler will run until primed gas is consumed.
The problem is that the gas that sat in the carb all winter glazed it over and gummed it up. Begin by going to any auto parts store, like an aiutozone, and getting a bottle of carb. cleaner. Seafoam is one I use. Add it to your gas, one ounce per gallon of gas. Also, pick up a can of engine starting spray.
Remove the air filter and spray the engine starting spray into the air intake. Pull start the engine and give it additional squirts of engine starting spray until it runs smoothly.
SOURCE: toro 521 snowblower..nn replace gas line to carb,
Or, you can try the easy approach. Take a 1/4" bolt about 2" long and cutoff the head. Force the bolt into the old fuel line on the fuel tank side (after removing fuel tank), push other end into new fuel line, tape the lines together well with electrical tape. Gently pull from one side and push from the other until new section of line comes through. Just did this and it too all of 5 minutes.
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