The Briggs & Stratton 11.5hp Intek Series delivers unmatched reliability along with superior performance and durability. The new Intek series engines were designed to be best in its class combining power, performance, features and size.These engines offer consumers and professionals commercial grade features including easy starting, quieter operation, longer life.

Typical Applications :- This Briggs & Stratton Intek series engine is a ideal replacement engine for most ride on mowers on the market. It is a ideal replacement for all previous Briggs & Stratton 8.0 - 11Hp models.

Key Features

  • Automotive Style Dipstick
  • Briggs Model 21R877
  • Electric Start 
  • Super Quiet Muffler / Fuel Tank supplied
  • Dura-Bore cast iron cylinder sleeve
  • Over Head Valve Engine (OHV)
  • High capacity Dual Clean Premium Air Filter
  • Rewind Starter Fitted
  • Float-Feed Carburetor & Mechanical Governor
  • Electronic Ignition
  • 1 inch Diameter / 3.5/32' Long Keyway Shaft
  • Vertical Shaft
  • 479 (mm) x 393 (mm) x 327 (mm) (LxWxH)
  • 2 Year Warranty - Australia Wide


    Engine Series

    Briggs & Stratton Intek Series

    Engine Style




    Engine Type

    4 Cycle OHV

    Cooling System


    Dry Weight

    65 Lbs

    Engine CC


    Engine HP


    Cylinder Bore Type

    Cast Iron


    3.44 inches


    2.26 inches

    Starting System

    12 volt key start w/back up recoil

    Ignition System

    Electronic Spark

    Oil Filter


    Oil capacity

    48 oz



    Air Cleaner

    Dual Element

    Fuel Tank


    Crankshaft Rotation


    Shaft Size

    1 x 3-5/32 Inch

    Crankshaft Type

    Straight Keyway

    Crankshaft Diameter

    1 Inch

    Crankshaft Length


    Crankshaft End Tapped Size


    Crankshaft Keyway Width

    1/4 Inch


    2 Years


    479 (mm) x 393 (mm) x 327 (mm) (LxWxH)

    Customer Questions

    Ask Question
    Q: I have a Rover Ranger with an 10.5 Briggs Stratton Engine Model 257707 Type 012901 Code 9108071. Would this engine fit on as replacement same drive shaft and engine mounts?

    A: The new Briggs 11.5HP Intek Series engine with fuel tank will be your new replacement option, it will have the same shaft and mountings.

    Q: Hi there I gather that I'd have to purchase a ignition system and wiring loom to connect the electric start?

    A: The engine comes complete with ignition and wiring loom. You will just need to connect it up to your mower.

    Q: My question is almost identical to the one below except my engine is Model 28B707 Type 0120 01. From the photos it would appear to have a very similar throttle set up on LH side. Is that the case?

    A: If the engine you are replacing had a fuel tank fitted, then the new Briggs 11.5HP Intek Series engine with fuel tank will be your replacement option. If the engine you are replacing did not have a fuel tank fitted, then the new Briggs 13.5HP Intek Series engine will be your replacement option. Both these engines will have the same shaft and mountings. The throttle setup will be similar.