Specifications
We recommend that you use an authorized Briggs & Stratton Service Dealer for all maintenance and service of the engine and engine parts. Use only genuine Briggs & Straton parts.
In the state of California, Model 540000 and 610000 engines are certified by the California Air Resources Board to meet emissions standards for 1000 hours.
Such certification does not grant the purchaser, owner or operator of this engine any additional warranties with respect to the performance or operational life of this engine. This engine is warranted solely according to the product and emissions warranties stated elsewhere in this manual.
Model 540000
Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.36 in. (85.5 mm) Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.07 in. (78 mm) Displacement . . . . . . . . . . . . . . . . . . 54.6 cu. in. (895 cc)
Model 610000
Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.36 in. (85.5 mm) Stroke . . . . . . . . . . . . . . . . . . . . . . . . 3.040 in. (86.5 mm) Displacement . . . . . . . . . . . . . . . . . 60.59 cu. in. (993 cc)
Tune-up Specifications
Armature air gap . . 0.005 − 0.008 in. (0.13 − 0.20 mm) Spark plug gap . . . . . . . . . . . . . . . . . 0.030 in. (0.76 mm)
Valve clearance with valve springs installed and piston 1/4 in. (6 mm) past top dead center (check when engine is cold).
Intake . . . . . . . . . . . . 0.004 − 0.006 in. (0.10 − 0.15 mm) Exhaust . . . . . . . . . . 0.004 − 0.006 in. (0.10 − 0.15 mm)
Note: Engine power will decrease
To get replacement parts or technical assistance in the future write your engine Model, Type and Code number along with the date of purchase here. These numbers are located on your engine. For the location, see page with Engine Features.
Model
Type
Code
Date of Purchase
Engine Power Rating Information
The gross power rating for individual gas engine models is labeled in accordance with SAE (Society of Automotive Engineers) code J1940 (Small Engine Power & Torque Rating Procedure), and rating performance has been obtained and corrected in accordance with SAE J1995 (Revision
Emission Information
Engines that are certified to meet the California Air Resources Board (CARB) Tier 2 Emission Standards must display information regarding the Emissions Durability Period and the Air Index. Briggs & Stratton makes this information available to the consumer on our emission labels. The engine emission label will indicate certification information.
The Emissions Durability Period describes the number of hours of actual running time for which the engine is certified to be emissions compliant, assuming proper maintenance in accordance with the Operating
&Maintenance Instructions. The following categories are used:
Moderate: Engine is certified to be emission compliant for 125 hours of actual engine running time.
Intermediate: Engine is certified to be emission compliant for 250 hours of actual engine running time.
Extended: Engine is certified to be emission compliant for 500 hours of actual engine running time. For example, a typical
Certain Briggs & Stratton engines will be certified to meet the United States Environmental Protection Agency (USEPA) Phase 2 emission standards. For Phase 2 certified engines, the Emissions Compliance Period referred to on the Emissions Compliance label indicates the number of operating hours for which the engine has been shown to meet Federal emission requirements.
For engines less than 225 cc displacement. Category C = 125 hours
Category B = 250 hours Category A = 500 hours
For engines of 225 cc or more displacement. Category C = 250 hours
Category B = 500 hours Category A = 1000 hours
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