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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Briggs mod 216112011E. Won't start, carb cleaned wiith no change. I'd like to see a carb diagram to make sure the re-assembly was correct . I suspect the float could out of position but I'm not sure.Any hints? Thanks a million! Mike

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This should help. As far as the float being out of position, if you invert the carb body (carb off mower) with the float hinge clip attatched, it should rest just about parallel to the body of the carb..a small straight edge will help..here are some diagrams
http://www.lawn-mower-shop.com/carb2.htm
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Posted on Sep 08, 2010

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Working on a Briggs and Stratton 10T502-1457-B1. Runs rough and has black smoke coming from exhaust. This engine has no float to stick so that is not the problem. It does have a fuel primer bulb that works...


if you replaced the diaphragm and gasket below the carb and are completely positive they are installed correctly and not damaged, then the carb is defective and they usually warp or the primer system goes bad

Oct 21, 2013 | Briggs & Stratton Garden

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17 hp briggs stratton ohc


Clean or change air filter. Clean, gap or change spark plug. Empty gas tank add fresh gas with Stabil. When spark plug is removed pull rope several times to blow out cylinder. Spray starter fluid in spark plug hole before replacing spark plug. Clean outside of carb so choke works freely. Spray starter fluid into carb breather hole with air filter removed and try to start. if running replace air filter and cover. If no start disassemble carb and clean. If no start replace carb.

Jun 19, 2013 | Garden

1 Answer

I have a briggs & Stratton 675 series engine in a Craftsman front wheel drive rotary mower which won't start. It was fully serviced and used 3 times this season but now it won't start. It


if it has hit a object, the flywleel key is partially sheared, and needs to be replaced. they are very inexpensive,CHEAP. this will through the engine out of time just enough it wont start.

Apr 16, 2013 | Briggs & Stratton Garden

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Won't start


yes your moving in the right direction if over head valve remove the valve cover and check the rocker arms and for bent push rods if a flat head remove the head and check the valves

Aug 19, 2012 | Briggs & Stratton Garden

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I have 120000 model engine on a troybuilt 566 self propelled mower. The engine will start and run for about 3-4 seconds and die. I have changed the spark plug,air filter, cleaned the fuel line, and...


You have done the correct things. This is definetely a problem with the fuel supply. Here are some other things to check.

1. Loosen the gas cap to ensure you don't have a vacuum in the tank. If you have a vacuum in the tank, it can prevent fuel from flowing to the carb. This is an easy thing to check, typically the engine will run for longer than 3-4 seconds when first started, but when restarted I have seen short run times like this. There should be a vent hole on the gas cap to prevent this from happening. If this is the problem clean the vent hole or get a new cap.

2. I don't know if this engine has a fuel pump, but the troubleshooting process is the same. Take off the hose to the carb and make sure you have fuel flow to the carb (use gravity if it doesn't have a fuel pump, or crank the engine if it does). If you have fuel, then the problem is in the carb (probably a stuck needle in the bowl assembly). Disassemble the carb bowl and clean the needle and seat with carb cleaner.

3. If you are not getting fuel through the hose to the carb, then you have a bad fuel pump or a plugged line.

Apr 18, 2011 | Briggs & Stratton Briggs Stratton Intek V...

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The engine starts ok but it keeps revving up and down, as though its about to conk out, although, so far, it hasn't. It has also started to blow out some white smoke? I have changed the spark plug - but...


Your Briggs & Stratton has a Sprint or Classic motor on it. Every few years, the diaphragm in the carburetor must be replaced.
Briggs part #495770

1. Remove the air filter assembly. This is a good time to clean and re-oil the filter.
2. Remove the 3/8" head bolt from the front of the fuel tank.
3. Remove the 1/2" head bolt from the side of the fuel tank.
4. Gently pull the fuel tank assembly toward you and tilt it away from you. While doing this, you will need to unhook the governor wire from the throttle plate.
5. Drain the gasoline (you can use it again later)
6. Remove the 5 screws that hold the carburetor on top of the fuel tank.
7. Pull the carb straight up. Be careful not to lose the spring or strainer on the bottom of the carb.
8. Remove the diaphragm.
9. Clean the carb and tank surfaces with carb cleaner spray.
10. Open the package with the new diaphragm in it. You will find 2 pieces. One is rubber, the other is paper.
11. Place the rubber diaphragm onto the fuel tank, then the paper one. Gently reinstall the carb onto the tank.
12. Push the 5 screws back into the carb. Before you tighten any of the screws, have all 5 pushed through and wiggle the carb a little, this will allow the diaphragm to align properly. Tighten the screws.
13. Reinstall the tank/carb assembly. Make sure you hook up the governor linkage.
14. Inspect the governor spring(s). They should be connected on both ends. You should not disconnect them for this repair.
15. Reinstall the air filter, gas, prime, and GO!

Good Luck!

Oct 25, 2010 | Briggs & Stratton Garden

4 Answers

Bolens MTD push mower with B&S 4.5HP 10H902-0285-E1 (SN-03122354).. Runs rough (pulsing) after cutting on an incline where mower was tipped to the right (carb) side.. It seems as if oil leaked over...


This is probably not a blown gasket issue. A bad head gasket can allow oil to enter the cylinder head/combustion chamber if it's not sealing off the valve area. A simple suggestion is to check on the engine opposite the carb side for the oil/crankcase breather. It will have 2 screws holding it onto the block. It has a type of filter media in it that traps excessive oil and oil vapors from the engine. It is also connected by a tube to the air filter housing. When you tipped, you probably put too much oil in the breather and it was inducted over to the air filter/carb intake side.
Clean or replace the breather after checking it and also make sure you haven't overfilled the Briggs with oil and only use SAE 30 in the engine. Muti-viscosity isn't recommended in summer unless you run synthetic, then it is OK.
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Sep 05, 2010 | Briggs & Stratton Garden

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I have a Snapper yard cruiser with a 15HP Kohler and Nikki Carb. THis Carb has no way to adjust Idle or High Speed fuel mixture. Since this engine repeatedly stalls with any load on it ecold or hot, I...


Correct that there are no adjustments, but try cleaning the carb jets first, as many times a small amount of debris in the fuel can cause a performance problem. A replacement carb will be close to $200, and NO carbs will be adjustable. A gasket kit is available if you need. Contact your local Briggs dealer to procure the part.

Try cleaning the jets first.
Fuel Starvation - Float Bowl Carburetor
1) remove air filter assembly
*be cautious of tearing the mounting gasket. If it does tear, you HAVE to replace it. It is part of the priming system
2) remove the float bowl fastener. This is the main jet
3) carefully remove the float bowl, the rubber o-ring/gasket will not be able to be used if it is removed, you WILL have to replace it
4) using a spray 'carb cleaner'
spray up thru the center of the carburetor
spray and clean the main jet with cleaner and 'tag' wire
(tag wire is very thin, and can be used to clean the hole in the center of the main jet)
5) clean any debris from inside the bowl or carb body
6) re-install bowl and center bolt, air filter assembly

*if you need gaskets, your Briggs dealer can supply. The kit is cheaper than individual gaskets, and all the parts needed to finish the above repair are in the kit.

Nov 21, 2009 | Garden

1 Answer

Briggs & stratton Modal No 490179 carburettor linkage


it sounds like the governer needs to be set and the carb needs to be cleaned out> I would get a carb rebuild kit and go to briggs online and look up how to set the gov dont run it till you do or you may blow the motor

Aug 31, 2009 | Briggs & Stratton Power Products 5,550...

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