850iS I/C Series™ InStart®

850iS I/C Series™ InStart®

Start effortlessly every time.

The 850iS I/C SERIES™ InStart® lithium-ion electric starting engine combines the power and performance of petrol with reliable durable battery powered starting.

InStart® - No Priming - No Choking - No Pulling - Instant & easy starting.


Gross Torque (Nm)


Displacement (cc)


Fuel Tank Capacity (l)


Engine Type


Electric Start

Effortless starting, every time. Skip pulling the rope, just push the button and go. Our latest lithium-ion battery technology, InStart® provides the ultimate in starting performance.

Guaranteed quick start for InStart

The InStart® technology is backed by our S2 Start Guarantee®. The engine starts at the latest on the second attempt, or it will be fixed for free*.

*More information about the conditions.>

No Oil Changes

Never change the oil again. Ever. Simply check your oil levels and add as you go.

*More information.>

Quieter Operation

The Super Lo-Tone™ Muffler significantly reduces noise and delivers very good tonal quality.

Optional: Reduces wear and extends engine life

The Pressure Lubrication with Oil Filter keeps the engine clean for a longer life. Delivers oil under pressure to critical engine components for maximum lubrication as well as reduces wear.

For More Information

Visit our Glossary of Engine Terms

Just Check & Add™

Never change oil ever, just check and add

S2 Starting Guarantee

Our personal starting guarantee. Your engine starts within the first two attempts - or we will repair it free of charge.

Optional: Paper Air Cleaner (Oval) with foam pre-cleaner (dual element)

Provides added protection against airborne debris entering the engine.

Optional Full Pressure Lubrication with Oil Filter

Is similar to an automotive engine that continuously delivers oil under pressure to critical engine components for maximum lubrication and long engine life.

Magnetron® Electronic Ignition System

Ensures maintenance-free, easy starting.

Mechanical Governor

Controls the engine speed to deliver more usable power under heavy usage.


Only 2 products can be compared at once. Please remove one of your selections to compare this product.

Only 3 products can be compared at once. Please remove one of your selections to compare this product.

At least one product must be displayed. Please select another option to remove this product

Engine Technology
Cast iron sleeve cylinder, 4-stroke, air-cooled, OHV (Overhead Valve), InStart® Technology
Model Number
Gross Torque* (Nm) @ 2'600 rpm
Displacement (cc)
Bore (mm)
Stroke (mm)
Fuel Tank Capacity (l)
Oil Capacity (l)
Dry Weight (kg)
10,8 (11,1 with Battery)
Dimensions Length (mm)
Dimensions Width (mm)
Dimensions Height (mm)
Certified Power Rating

* Power levels are stated gross torque per SAE J1940 as rated by Briggs & Stratton.



Download the operator's manual or illustrated parts list for your Briggs & Stratton engine or equipment by following our step-by-step process.

Find Manuals »


Have a question? Search our FAQs to find answers related to model specifications, routine maintenance, repair or troubleshooting.

Search FAQs »

Maintenance How-To Articles

Find DIY articles on how to use and maintain your Briggs & Stratton engine or equipment.

Find Articles »

Dealer Locator

Take advantage of the expertise your local dealer can provide for service and support on your lawn mower engine.

Locate A Dealer »