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Toro leaf blower gas 20 years old runs great for about 20 minutes then engine performance becomes erratic. let rest for 10 minutes and runs great again for 20 minutes.
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I run a 40:1 ratio in all my 2-stroke equipment, regardless of factory reccomendations. If you run a 32:1, you get excess heat and carbon build-up. 50:1, is too light of lubrication. 40:1 is just right! About 3.6 oz. per gallon of gas. I've had great luck with it for years! One of my blowers has been used commercialy for almost 15 years!
The oil level is low. when the oil drains from the engine it fills the base to the level of the sensor. When it runs it takes a little time for the oil level to drop below the sensor..........Hope this helps.
Just take off your carb and give it a good cleaning. Be careful and watch how everything comes apart so you can put it back together with little or no trouble.
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.
You will need to check the fuel lines for cracks/breaks.
You will need to disassemble the carburetor and spraywith carb.cleaner. Use a Den Tek Brush, (http://www.drugstore.com/products/prod.asp?pid=165357&catid=1152), to clean the small portals and/or jet in carb. These portals can become blocked. you may need to replace the diaphragm. Reassemble and start.
(NOTE:If the carburetor parts are more than four years old, and depending onthe use, you will need a new carb. kit if the cleaning doesn't work.)
It sounds as if the gas cap may be clogged. It must be able to breathe so that the carburetor gets the proper gas flow. Does it run for about 10-15 minutes? If so, this is more than likely your problem.
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.
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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