Question about Briggs & Stratton Lawn-Boy Insight Series 21-Inch 190cc 650 Series Gas Powered Engine Variable Speed Self-Propelled Lawn Mower

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I have a yardman 5hp lawnmower with b&s motor. it will fire up if i pour gas in the carb but wont stay running. what is the problem

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Carb jet is clogged...B&S carbs require special tools...find a shop...

Posted on May 28, 2010

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2 Answers

3.5 hp Briggs & Stratton won't run unless I pour gas into carb


This sounds like a problem with the suction. If the air filter is clean then it will need new carb gaskets. There may also be an issue with the pressure being created by the engine.

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1968 mustang 302 standard 2 bbl carb will turn over and sound like it wants to stay running but will not.


Remove the air cleaner and carefully pour small amounts of gas down the carburetor. Have a fire extinguisher near by. If the motor keeps running then the engine is not getting fuel. Check the fuel pump & gas filter.

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My b&s 6.5hp log splitter wont stay running unless i spray gas directly into the carb... this is where it's get funny, i took a carb off my


If your gas is E-10 then there is a strong possibility that the line from the tank is blocked, also could be a filter and even sludge in the gas tank all caused by E-10 seperating and becoming thick.

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1 Answer

Lawnmower starts and dies... where is the main jet for the carb?


try cleaning the air filter, then a touch of starting fluid right into the carburator by taking the air filter off. If it then starts but wont run or stay running, the reservoir below the carb should be removed to clean at and the pinhole in the intake tube above the bowl nut. This is the most common problem with lawnmower start problems, the pinhole can be unplugged with one wire from a wire brush. Be careful with the gas, at least pinch off the gas hose with a vise grips while removing the carb bowl.. Never use a droplight around gasoline. most lawnmowers have no mixture adjustments, so it is a matter of cleaning the carb, tank, gas lines. Some oils in gas mix systems settle and clog after less than one season.

Aug 27, 2010 | Poulan "Poulan" Push Mower

1 Answer

Lawnmower sat up for a season would not crank replaced sparkplugs air filter fuel filter hose fuel pump is pumping gas to carburator but still will not start unless you pour some gas into the carburator or...


If it will start when you pour gas then its a fuel problem on some of these they have a screw at the bottom of the carb remove that and see if you have bad fuel. If that does not work then remove the carb and service it may just be a stuck float or something

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1 Answer

Yardman snowblower wont start


More often than not, old gas in the carburator breaks down. It turns green and smells like turpentine. This usually fowls the carb inlet. I dodnot know the technical name but You can usually solve the problem by removing the bolt that holds the bottom of the carb. to the carb. It looks like a very small tin can under the carb. This contains the carb float and lets gas into the carb. The bolt is usually hollow and has two extremely small holes that allow gas to be taken up to the carb venturi. They are usually clogged and therefore no fresh gas gets through into the chamber. Use a very thin wire or needle to clear debri. Clean out old gas and residue before reassambley. It could also be the Carb float stuck closed and again no gas is getting through. You can service these issues usually without taking the carb off the motor.

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2 Answers

Gas pouring out of carb into air box


sounds like it take bottom of carb off and see if needle is stuck

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5hp Briggs & Stratton lawnmower starts but stop running?


Try cleaning the air filter, and check fuel tank for any debris.
Replace fuel filter if there is, and give the fueltank a good cleanout.
Use fresh fuel to refill.

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MTD yardman chipper wont start get spark need manual


I am successful too at using the starting fluid in the carb or directly into the clinder. That is how I start my MTD 5.5hp chipper. My problem is I have to hold down the primer bulb to keep it running. If not, the engine will stall.

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2 Answers

5hp b&s mtd chipper wont start


defiantly the carb but its not bad - clean / soak it with some seafoam and blow out all the holes. its just clogged and isnt getting the fuel/air mixture right.

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