121S07-0986-F1 Briggs and Stratton Engine - Overview

Sections of the 121S07-0986-F1

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Key-flywheel – Part Number: 222698S
Key-flywheel
PartSelect #: PS8925657
Manufacturer #: 222698S
This is a Genuine OEM replacement part used on a variety of Lawn and Garden equipment. The key helps to secure Flywheel in place. This is a Metal Key and it is Sold Individually. You would need Plier...
$5.95
  In Stock
Order within the next 9 hrs and your part ships today!
Retainer-Gov Shaft – Part Number: 690340
Retainer-Gov Shaft
PartSelect #: PS9062930
Manufacturer #: 690340
$7.95
  Special Order
Crank-Governor – Part Number: 798327
Crank-Governor
PartSelect #: PS9138635
Manufacturer #: 798327
$22.95
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Pin-piston/std – Part Number: 298909
Pin-piston/std
PartSelect #: PS8942667
Manufacturer #: 298909
$15.95
  Special Order
Ring Set-020 – Part Number: 590403
Ring Set-020
PartSelect #: PS9034607
Manufacturer #: 590403
$95.95
  Special Order
Lawn Mower Starter Rope Grip – Part Number: 281434S
Lawn Mower Starter Rope Grip
PartSelect #: PS9274582
Manufacturer #: 281434S
$6.95
  In Stock
Order within the next 9 hrs and your part ships today!
Gasket-intake – Part Number: 590398
Gasket-intake
PartSelect #: PS9044000
Manufacturer #: 590398
$8.95
  Special Order
Seal-oil – Part Number: 399781S
Seal-oil
PartSelect #: PS8960670
Manufacturer #: 399781S
This is an authentic replacement part manufactured for use with small engines. Seals can deteriorate overtime, and it is recommended to replace worn seals when servicing an engine. This seal is the lo...
$13.95
  Special Order
Screw – Part Number: 691664
Screw
PartSelect #: PS9074230
Manufacturer #: 691664
$7.95
  Special Order
Seal-o Ring – Part Number: 691031
Seal-o Ring
PartSelect #: PS9063625
Manufacturer #: 691031
This authentic item is supplied directly from the original equipment manufacturer for use with engines, outboard motors, portable generators, snowthrowers, and lawn mowers made by Briggs & Stratton an...
$9.95
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Lever-control – Part Number: 691028
Lever-control
PartSelect #: PS9062994
Manufacturer #: 691028
This is an original replacement part sourced directly from the manufacturer. The control lever is commonly found in engines, generators, and pressure washers from Briggs & Stratton, and in lawn tract...
$85.95
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Adjuster-Rocker Arm – Part Number: 796631
Adjuster-Rocker Arm
PartSelect #: PS9138586
Manufacturer #: 796631
$24.95
  Special Order

Questions And Answers for 121S07-0986-F1

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Kenneth
July 15, 2023
My mower suddenly stopped just like running out of fuel.. I have fuel, spark and clean air filter. Cleaned and checked the carb bowl..all looks good. Just crank and no start. Checked plug and was dry,would not even start with starter fluid. Makes no sense, everything's there. Do I need to open the carb and check the flap? I'm a shade tree mch..lol. thanks for your help PS: mower is about 7 yrs old and in good shape, reg maintained
For model number 121S07-0986-F1
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Hi Kenneth, thank you for the question. Make sure your fuel filter is also clean and the spark plug wire is firmly connected to the spark plug. Remove the flywheel and check the flywheel key. Check the wire harness connection on the fuel solenoid valve. Reconnect the valve wire harness if you found it disconnected. Check the fuel line from the fuel tank to the carburetor for clogs or damage, clear any clogs. Make sure the fuel pump is moving gas through the fuel line to the carburetor. If the issue is still persisting, we recommend replacing the carburetor overhaul kit, part number PS9983616. We hope this information is useful!
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Bought Troy Built pressure Washer at garage Sale for $30.00 leaked fuel
I have a solid understanding of small engines. This pressure washer was used twice in 2013, when purchased. Sat in a garage for a couple of years with gas in tank and carburetor. Owner was moving and after 7 years of moving it around he sold it at a garage sale.
I took it home and took off gas tank and thoroughly cleaned it. Then went through the carburetor and let soak in cleaner. Cleaned up the spark plug, tested and has good spark. reinstalled carburetor but would not start. I knew I had gas issues. I ordered a carburetor kit and replace the needle valve and seals. Still would not start. Ordered a new carburetor and spark plug. Installed both. Two pulls and it runs like new. Advice: don't try to clean out old carburetor, just buy a new one and install.
Parts Used:
Kit-carb Overhaul
  • Laird from North Las Vegas, NV
  • Difficulty Level:
    Difficult
  • Total Repair Time:
    More than 2 hours
  • Tools:
    Nutdriver, Pliers, Screw drivers, Socket set
2 of 3 people found this instruction helpful.
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Screw in new dipstick, check oil level
Very well
Parts Used:
Dipstick
  • Kim from KENNER, LA
  • Difficulty Level:
    Very Easy
  • Total Repair Time:
    Less than 15 mins
5 of 18 people found this instruction helpful.
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