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

1 Answer

Have a B&S engine that will not stay running. I have replaced the fuel, battery, air filter and spark plug. Cleaned the fuel filter. If I remove the air filter and shove a rag in the hole, the mower will run until I remove the rag....Anyone know what my next step to fix the problem is?

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Hello,

My name is Dane and I am going to help you solve your problem. I believe that you have clogged jets/passages inside of your carburetor. This can happen when an engine gets little use, allowing the fuel in the system to get old and begin breaking down. If fuel is left in a carburetor for more than a year, it can eventually turn into a jelly like consistency, and clog the fuel system. The other way to block these passages is to allow dirt or other debris to enter the fuel tank. This will be picked up through the fuel line, also clogging the system. The symptoms can be anywhere from a slight miss, to the engine not running at all. Always check your spark plug first before starting any troubleshooting procedures on an ignition system. Clean or replace it if it appears fouled, burnt or otherwise unserviceable.

You will probably need to remove, disassemble, soak, and use compressed air to blow out the jets in your carburetor. Pay close attention to how the carburetor is attached to the engine. Make a drawing if you need to or take some pictures. Remove the Carburetor from the engine. Remove the air filter, linkages, throttle/choke cables and fuel line. Remove the mounting bolts/nuts. You will need to disassemble the carburetor as far as possible and put it in some Carburetor cleaning solution. You can get this at any auto parts store. Do not place rubber parts in the solution. Allow it to soak in cleaner as directed, and then blow out the ports and jets with compressed air immediately after you take it out of the cleaning solution. Be careful not to get any spray back on your skin or in your eyes. Reinstall the Carburetor in the reverse order. Replace any worn or torn gaskets or o-rings as you assemble and reinstall it. Check the air filter and make sure it's clean and not oil soaked. Replace if needed. If you suspect your fuel was contaminated or old you should also drain, and flush your fuel tank. Dispose of your old fuel properly.

Just a TIP: Always mix your fuel with an approved fuel stabilizer. Fuel begins to go bad after a few months and that's why many people have fuel problems in the spring

I hope I've helped. Thank you! Dane

Posted on Dec 29, 2010

  • dakotadriver Dec 29, 2010

    Thanks so much for your advise. I really appreciate how detailed you were.

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I have replaced the gas filter & spark plug. Cleaned the air filter & carbuator & it will start but won't stay running.


sounds like a fuel supply problem. replace the fuel filter.
clean the fuel pipes back to the fuel tank.

Aug 09, 2015 | Garden

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When I turn the key on I can hear fuel pump prime and from some where around the carburetor I hear a buzz noise.


Make/Model/Year helps get a more specific answer.

However, that buzz noise around the carburetor may be a fuel cutoff solenoid.
Note: On Riding Mowers if battery voltage drops below 9 volts when cranking or while the engine is running, the fuel solenoid will not function. That means the engine will not start or will die soon after starting.

  1. verify battery fully charged.
  2. verify the fuel cutoff solenoid clicks when you turn the key switch.
  3. Check your battery voltage before, during, and after cranking. If the battery voltage is good before but drops below 9 volts while cranking this is generally a sign the battery has one or more bad cells.
If the problem is not the fuel solenoid you will have to go step by step through the fuel, fire, and air diagnostics. Here is the routine we use on riding mowers.

For a more precise answer we need Make/Model/Year/Engine Model/Deck Size, and hours on meter if you have one.
Let's say you have less than 300 hours on the engine. Let's further assume it worked last summer, or last week, but now it's acting up. Let's also verify the battery is in good shape and fully charged.

A mechanically functional (meaning all the internal parts are working, i.e. pistons, valves, etc) engine requires 3 things, air, fuel, spark. So the quickest way to start your diagnostics is to remove the cover over the air filter and then remove the air filter. I do not recommend spraying Quick Start.

  1. remove air filter (set it aside for the rest of the diagnostics)
  2. put throttle on fast run (do not choke)
  3. pour an ounce or two (a shot glass) of fresh gas into the carburetor
  4. crank engine (15 to 20 seconds, rest to cool the starter, repeat 3 times if it does not fire at first).
Removing the air filter and placing the throttle at full speed with no choke eliminates the "air" question. Dumping in the fuel eliminated all fuel related questions. What's left? Spark. If the engine fires and runs a bit, then dies, you have eliminated the spark question. The engine started so Spark and Air are good; you have to track down a fuel problem.

If the engine does not fire, you have eliminated the Air & Fuel questions; you must tract down a Spark problem.

Tracking down fuel problems.
  1. Make sure there is plenty of fresh fuel in tank.
  2. Remove fuel line from filter and remove the filter, gas should pour out of the hose coming from the tank. If it does not, remove gas tank cap. If fuel flows now, you need to unclog the cap vent or replace the cap. If the fuel still does not flow then blow air from the filter end of the hose back up through fuel line to blow out blockage inside the gas tank. Once you have fuel flowing out the line to the filter, PUT ON A FRESH FILTER. Try cranking the engine. If it still does not start move on to the carburetor.
  3. Note: many systems have a fuel shut off solenoid. This is a small black cylinder on the bottom of the carburetor. It has two wires running to it. It should make an audible click when you turn the key on.
  4. NOTE: if battery voltage drops below 9 volts when cranking or while the engine is running, the fuel solenoid will not function. That means the engine will not start or will die soon after starting. So check your battery voltage before, during, and after cranking. If the battery voltage is good before but drops below 9 volts while cranking this is generally a sign the battery has one or more bad cells. Replace the battery. If the battery is in fact good and the voltage is still dropping you may have a bad starter motor and it is drawing too much amperage.
  5. Ck to see that the carburetor bowl is full of fuel, if not...you may have to disassemble and clean the carb at this point.
Tracking down Spark problems.
  1. verify battery fully charged.
  2. verify the fuel cutoff solenoid clicks when you turn the key switch.
  3. get fresh spark plugs and verify gap
  4. install plugs and crank. Perhaps verify spark with a spark tester.
If these simple steps do not solve the spark problem, you have a Spark problem that moves into the arena of complex. You will need to check coil gap and coil performance. If it still doesn't start you will need to diagnose the electrical system for wiring and safety switch problems, key switch problems, fuses, etc.

A Problem of Air Control.
If you determine the Spark & Fuel systems are good, the next likely problem is Valve adjustment out of wack. This is a problem of Air Control (and its sister compression), the third element in the engine trinity. Usually this problem shows up as backfire; either back through the carburetor or out through the exhaust. It will backfire while you are trying to start it. HOWEVER, it does not always generate backfire. You may instead notice that the engine spins more freely than usual; or oddly enough just the opposite and the engine bind while you are cranking it. This is because the compression is lost by out of wack valves or the compression is out of sync with the spark. You need a valve adjustment.

Once you get it running be sure to replace the Air Filter with a new one.

These simple steps solve most starting and running questions and problems.

Mar 19, 2015 | Garden

2 Answers

My d100 will not start


Check for good , strong spark. Take spark plug out and ground the outer core of the plug to the engine. Hold the plug with a pair of insulated pliers. Have someone crank the engine while you observe for a good strong blue spark. If the spark looks nice and bluish, then next would be to clean the carburetor. I suggest trying a "quick clean before taking the carburetor bowl off. Take spray carburetor cleaner and spray inside the carb throat with the air cleaner off. Also take about 1/2 can/bottle of fuel line injection cleaner and put it in the gas tank. Then try starting the mower. May sure the gas in the tank is fresh.

Jun 20, 2014 | John Deere Garden

1 Answer

Toro Timecutter 14.38Z Model 74301 Briggs & Stratton Engine Model 280H07-0166-E1 Has NIKKI carb Starts & runs for ~ 15 minutes then stops. Will restart after 5 minutes rest and run...


Recheck spark when the unit cuts out. I am gonna guess you spent a lto of money chasing a bad coil! When a coil starts to go bad they become temperature sensitive. Time does the rest!

Dec 27, 2012 | Garden

1 Answer

I have a 1990 mitsubishi might max it wont run smooth unless you keep your foot on the gas and keep the rpms up a little bit and it wont drive cause it stalls everytime you try to move it. ive replaced the...


You've already eliminated the spark plug & wireset, distributor cap & rotor.
Sounds like your car needs a tune-up, specifically, the PCV (positive crankcase ventilation) valve, and/of the EGR (Exhaust Gas Recirculation) valve.

Components checked/replaced during a tune-up are:
air filter
motor oil
motor oil filter
breather filter
fuel filter(s)
fuel strainer
PCV valve
EGR valve
spark plugs
spark plug wires
ECM or distributor cap & rotor
cabin air filter
transmission oil filter
transmission oil
engine coolant
check all vacuum hoses and lines

Troubleshooting the no-start condition - from the 1990 Mitsu Mighty Max Repair Manual:

Priority Action Part Type -- Cause
1 Inspect Battery -- Battery Discharged or Faulty.
2 Inspect Battery Cable -- Corroded, Broken, Shorted or Poorly Connected Battery Cable.
3 Inspect Distributor Cap -- Distributor Cap Cracked or Burned.
3 Inspect Fuel Filter -- Clogged or Dirty Fuel Filter.
5 Inspect Ignition Coil -- Faulty Ignition Coil.
6 Inspect Wireset -- Worn, Damaged or Faulty Spark Plug Wire(s).
7 Inspect Spark Plug -- Incorrectly Gapped or Fouled Spark Plug(s).
8 Inspect Starter -- Starter Motor Faulty.
9 Inspect Fuel Pump -- Low Fuel Pressure.
10 Inspect Solenoid Switch -- Faulty Starter Solenoid Switch.
11 Inspect Fuel Pump Relay -- Faulty Fuel Pump Relay.
12 Inspect Fuel Injector Pressure Regulator -- Faulty Fuel Injector Pressure Regulator.
13 Inspect Ignition Switch -- Improperly Connected or Faulty Ignition Switch.
14 Inspect Starter Drive -- Faulty Starter Drive.
15 Inspect Fuel Injector -- Dirty or Worn Fuel Injectors.
16 Inspect Fuel Pump Strainer -- Clogged or Dirty Fuel Pump Strainerat.
17 Inspect Engine Control Computer -- Incorrect Operating Information Being Delivered and Sent From The EEC.
18 Inspect Fuel Tank -- Fuel Tank Empty.
19 Inspect Carburetor -- Carburetor Flooded or Faulty Choke.
20 Inspect Distributor -- Worn, Loose, or Incorrectly Installed Distributor.

Aug 17, 2011 | 1993 Mitsubishi Mighty Max

2 Answers

How do I get my lawn mower ready for spring time use?


This is what a "General service" looks like at www.arcolawn.com
  • (Mower 2 cycle GS)
GENERAL SERVICE:
1. SHARPENED & BALANCED BLADE
2. REMOVED BLOWER HOUSING & CLEANED COOLING FINS
3. REPLACED SPARK PLUG
4. FLUSHED FUEL SYSTEM
5. CLEANED CARBURETOR HOUSING
6. LUBED CABLES
7. CHECKED OIL SEALS
8. SERVICED AIR FILTER
9. CLEANED EXHAUST PORTS
10. TESTRAN & ADJUSTED.

  • (Mower 4 cycle gs)
GENERAL SERVICE 1. SHARPENED & BALANCED BLADE 2. REMOVED BLOWER HOUSING & CLEANED COOLING FINS 3. REPLACED SPARK PLUG 4. CHANGED OIL 5. FLUSHED FUEL SYSTEM 6. CLEANED CARBURETOR 7. LUBED CABLES 8. CHECKED OIL SEALS 9. SERVICED AIR FILTER 10. TEST RAN & ADJUSTED.


  • (rider tuneup)

Tune up
1.TIGHTENED ENGINE MOUNTING BOLTS
2. INSPECTED BOTTOMOIL SEAL.
3.TEST GOVERNOR OPERATION & ADJUSTEDRPM'S.
4.CHECK SHAFT BEARING.
5.REMOVED BLOWER HOUSING &CLEANED COOLING SYSTEM.
6. REPLACED SPARK PLUG
7.CHANGED OIL.
8.REPLACED OR CLEANED AIR FILTER.
9.ADJUST FUEL/AIR MIXTURE & SPEED LIMIT SCREWS.
10.REPLACED FUEL FILTERS AS REQUIRED.
11.CHECK FUELLINES, VALVES, & CLAMPS.
12.INSTALL FRESH FUEL IN GASTANK.
13.SHARPEN BLADE(S) & CLEAN UNDER BLADE COVER.
14.CHECK DECK, EXAMINE BELTS, PULLEYS.
15. EXAMINETRANSMISSION/DIFFERENTIAL FLUID LEVELS,
16.CHECKGREASE FITTINGS, WHEELS, WHEEL BEARINGS, HEIGHTADJUSTER.
17. CHECK CABLES & CONTROLS ADJUST BRAKE &CLUTCH.
18. CHARGE & TEST BATTERY. (IF EQUIPPED).
19. TESTSAFETY SYSTEMS.
20.REMOVED CYLINDER HEAD & CHECKEDCYLINDER FOR WEAR/DAMAGE. CHECKED ROD BEARINGPLAY. 21.CHECKED VALVES FOR PITTING, WARPING, CARBONBUILDUP & SEATING.
22.CHECKED VALVE STEM CLEARANCESFOR EXCESSIVE WEAR.
23.CLEANED CARBON BUILDUP FROMCOMBUSTION CHAMBER.
24.MACHINED HEAD FLAT.
25.CHECKEDTIMING KEY FOR DAMAGE.
26.CLEANED OR REPLACED POINTSAND CONDENSER (AS NEEDED).
27. SET TIMING. ADJUSTEDMAGNETO AIR GAP.
28.CHECKED THROTTLE SHAFT FOREXCESSIVE WEAR & REPLACED IF NEEDED.
29.DISASSEMBLED& CLEANED CARBURETOR. REPLACED DIAPHRAGM, NEEDLE &SEAT, NEEDLE VALVES ETC. AS NEEDED.(see carburetor section)



I hope this helps! get parts for the service at a dealer like www.arcolawn.com

Feb 14, 2011 | Garden

1 Answer

My 5.5 honda engine on my lawnmower will start but wont stay running already cleaned the carb out didnt help there is no restrictions in the fuel lines im lost please help


it sounds like a fuel problem.
first drian fuel out of tank.
i know you have already cleaned the carby but dis assemble carby and clean with carby cleaner.
re assemble carby & fill tank with fresh fuel.
also clean air filter & check oil level & check spark plug,if the spark plug is black and the tip is blocked with oil build up, then replace.

Oct 22, 2010 | Honda Garden

1 Answer

Drove 96 dodge caravan thru a flash flooded roadway. had to make a quick a quick stop, van died. Have replaced starter because of grinding upon trying to start. Now it just makes one click when trying to...


Check cables must be tight at battery & starter. You must have 12 volts coming out of battery to starter.
Pull your dip stick is it over filled or milky looking. If so you very likely have water in engine.
Can you turn the fly wheel or is the engine locked up?
Drain the oil replace filter remove spark plugs turn engine backward to unlock engine. Drain fuel and replace fuel filter. Remove air filter has it gotten wet? Now crank it over with Air filter & spark plugs out. Now put in new air filter spark plugs dry wires & coils. And start the car, If car starts don't drive drain transmission change filter. If it did not start you may have done damage to computer or wiring.
But you got to see if engine is locked up if 12 volts is to starter & that no water is in oil or fuel.

May 31, 2010 | 1996 Dodge Grand Caravan

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