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Mita Prima
Mita Prima

The Briggs & Stratton Powerbuilt™ 500cc Engine features 12V electric start, rewind backup and a 9 Amp DC alternator. The exhaust manifold and muffler are included but fuel tank is omitted. For use on riding lawn mowers, wide area walk-behind mowers and trail mowers. Emission-compliant engine is for sale in all 50 states.

What's Included
  • (1) Engine with electric start/recoil backup

Features + Benefits

  • Dura-Bore™ cast iron cylinder sleeve for extended life
  • Maintenance-free Magnetron® electronic ignition and float carburetor for consistent, easy starts
  • Dual-Clean™ dual-element air cleaner for maximum protection
  • Patented balancing system for smoother performance
  • Gear-driven DuraLube™ splash lubrication bathes all internal engine parts with oil
  • Tool-less air filter cover for easy access
  • Heavy-duty Teflon sleeve bearing withstands load and reduces wear
  • Automotive dipstick makes checking oil levels easy
Key Specs
Item# 42551


Manufacturer's Warranty2 years consumer use / 1 year commercial use
Ship Weight88.0 lbs
Engine Displacement (cc) 500
Start Type Electric w/recoil backup
ApplicationRiding mower, lawn tractor, trail mower
Engine TypeIntek
Shaft Output Vertical
Crankshaft1 x 3 5/32
Shaft Diameter (in.)1
Shaft Length (in.)3 5/32
Shaft Keyway (in.) 1/4
Shaft End Tapped (Diameter (in.)/Threads per inch)7/16-20
Shaft Rotation (From PTO Shaft Side)CCW
Gear Reduction No
Bearing Type Plain
Cylinders (qty.) 1
Cylinder Bore Cast iron
Bore x Stroke (in.) 3.56 x 3.06
Compression Ratio 8.5:1
Cooling System Air cooled
Air Cleaner Type Dual element
Fuel Tank Not included Fuel Type Gasoline Fuel Pump No Fuel Filter No Oil Capacity (qt.) 1 1/2 Lubrication System Splash Low Oil Alert No Low Oil Shutdown No Ignition System Electronic Governor System Mechanical Carburetor Float Throttle Control Remote Choke Control Manual Max. RPM 3,300 Charging System Amps 9 Muffler Included Yes Flywheel Brake No Auto Compression Release Yes Bolt Circle (in.) 10 Dimensions L x W x H (in.) 19 x 16 x 13 EPA/CARB Approval (California Air Resource Board) Yes

Warranty: 1-Year Warranty

Briggs & Stratton Powerbuilt OHV Vertical Engine — 500cc, 1in. x 3 5/32in. Shaft, Electric Start with Recoil Backup, Model# 31R907-0006-G1

  • Product Code: MTP3477871

The Briggs & Stratton Powerbuilt™ 500cc Engine features 12V electric start, rewind backup and a 9 Amp DC alternator. The exhaust manifold and muffler are included but fuel tank is omitted. For use on riding lawn mowers, wide area walk-behind mowers and trail mowers. Emission-compliant engine is for sale in all 50 states.

What's Included
  • (1) Engine with electric start/recoil backup

Features + Benefits

  • Dura-Bore™ cast iron cylinder sleeve for extended life
  • Maintenance-free Magnetron® electronic ignition and float carburetor for consistent, easy starts
  • Dual-Clean™ dual-element air cleaner for maximum protection
  • Patented balancing system for smoother performance
  • Gear-driven DuraLube™ splash lubrication bathes all internal engine parts with oil
  • Tool-less air filter cover for easy access
  • Heavy-duty Teflon sleeve bearing withstands load and reduces wear
  • Automotive dipstick makes checking oil levels easy
Key Specs
Item# 42551


Manufacturer's Warranty2 years consumer use / 1 year commercial use
Ship Weight88.0 lbs
Engine Displacement (cc) 500
Start Type Electric w/recoil backup
ApplicationRiding mower, lawn tractor, trail mower
Engine TypeIntek
Shaft Output Vertical
Crankshaft1 x 3 5/32
Shaft Diameter (in.)1
Shaft Length (in.)3 5/32
Shaft Keyway (in.) 1/4
Shaft End Tapped (Diameter (in.)/Threads per inch)7/16-20
Shaft Rotation (From PTO Shaft Side)CCW
Gear Reduction No
Bearing Type Plain
Cylinders (qty.) 1
Cylinder Bore Cast iron
Bore x Stroke (in.) 3.56 x 3.06
Compression Ratio 8.5:1
Cooling System Air cooled
Air Cleaner Type Dual element
Fuel Tank Not included Fuel Type Gasoline Fuel Pump No Fuel Filter No Oil Capacity (qt.) 1 1/2 Lubrication System Splash Low Oil Alert No Low Oil Shutdown No Ignition System Electronic Governor System Mechanical Carburetor Float Throttle Control Remote Choke Control Manual Max. RPM 3,300 Charging System Amps 9 Muffler Included Yes Flywheel Brake No Auto Compression Release Yes Bolt Circle (in.) 10 Dimensions L x W x H (in.) 19 x 16 x 13 EPA/CARB Approval (California Air Resource Board) Yes

Warranty: 1-Year Warranty

$222.03

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Tags: briggs stratton vertical 390cc 241cc 31r907 model backup recoil start with electric shaft 32in 500cc engine powerbuilt engines Briggs Stratton Powerbuilt Vertical Engine 500cc 1in. 5/32in. Shaft Electric Start Recoil Backup Model# 31R907-0006-G1 241cc - 390cc Briggs & Stratton Vertical Engines 241cc - 390cc Briggs & Stratton Vertical Engines Briggs & Stratton Powerbuilt OHV Vertical Engine — 500cc 1in. x 3 5/32in. Shaft Electric Start with Recoil Backup Model# 31R907-0006-G1 Briggs & Stratton Powerbuilt OHV Vertical Engine — 500cc 1in. x 3 5/32in. Shaft Electric Start with Recoil Backup Model# 31R907-0006-G1 241cc - 390cc Briggs & Stratton Vertical Engines

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Yes, parts are not ordered via the Internet. If you wish to order a part please email us directly at sales@mitaprima.com with the product name and model number.

See the under product name in product page listed availability in stock or not. If in stock, you can make order the item. but if no in stock, you will cannot order the item.

Yes, we offer free shipping cost. We will ship your order in 2 - 3 business days after your order have been placed.

The prices of all our items are final prices including sales tax. You will not be charged any additional fees after placing an order through our online store.

In stock items usually ship between 2 - 3 business days. Our delivery time is 7 - 20 business days.

Yes, we ship to overseas.