advance product service information - the...

BRIGGS & STRATTON CORPORATION

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DATE:

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of 10 Copyright Briggs & Stratton Corp.

NEW 550 SERIES OHV ENGINE

69

7/21/10

550 SERIES (MODEL 083100) HORIZONTAL SHAFT OHV ENGINE

Briggs & Stratton recently introduced the 550 Series horizontal shaft engine. The following lists some of the fea-tures of this engine.

This APSI provides basic servicing information in advance of the repair manual currently in development. See the Illustrated Parts List for service part numbers. The speci! cations, part numbers, and/or procedures provided are PRELIMINARY and subject to change.

ADVANCE PRODUCT SERVICE INFORMATION

Pleated paper air ! lter element• Gear reduction option• Carburetor has an integral fuel shutoff valve• Metal fuel tank with 2 Liter (.5 gallon) capacity•

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Model 083100 MetricArmature Air Gap .15-.25 mmBore 62 mmCrankshaft End Play .05 - .33 mmDisplacment 127 ccExhaust Valve Clearance .13-.18 mmIntake Valve Clearance .13-.18 mmOil Capacity .54-.59 LSpark Plug Gap .76 mmSpark Plug Torque 20 NmStroke 42 mm

Common Speci! cations

2.56˝(65.1)

2.56˝(65.1)

12.60˝(320)

4.17˝(106)

1.18˝(30)

3.78˝(96)

3.46˝(88)

2.6˝(66)

1.40˝(35.7)

5x .312-24UNF 2B, 15 deep

5.49˝(139.5)

9.0˝(232)

4.53˝(115)

2 - .35˝ (9)

2 - .35 x .55˝(slot) (9 x 14)

3.15˝(80).2˝

(5)

3.95˝(100)

.41˝(10.5)

6.38˝(162)

7.32˝(186)

1.36˝(12)

Dimensions

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Cylinder and Crankcase Cover Assembly

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Cylinder Head, Rocker Cover and Gear Reduction Assembly

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Fuel Tank and Carburetor Assembly

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Governor Assembly

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Muffler and Air Cleaner Assemblies

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Blower Housing, Flywheel, and Ignition Assemblies

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Description SAE MetricAir Cleaner Base / Backplate 100 lb-in 11 Nm

Armature 100 lb-in 11 NmBlower Housing 100 lb-in 11 Nm

Carburetor Bowl Nut 70 lb-in 8 NmCarburetor Drain Screw 70 lb-in 8 Nm

Carburetor Nut 100 lb-in 11 NmCasing Clamp 20 lb-in 2 Nm

Connecting Rod 135 lb-in 15 NmControl Bracket 100 lb-in 11 Nm

Crankcase Cover 100 lb-in 11 NmCylinder Head 260 lb-in 29 NmCylinder Shield 100 lb-in 11NmFlywheel Guard 100 lb-in 11 Nm

Flywheel Nut 55 lb-in 75 NmFuel Tank 100 lb-in 11 Nm

Governor Lever Nut 100 lb-in 11 NmMuffler 240 lb-in 27 Nm

Muffler Guard 80 lb-in 9 NmOil Drain Plug 240 lb-in 27 NmRewind Starter 80 lb-in 9 Nm

Rocker Arm Stud 240 lb-in 27 NmRocker Ball Setscrew or Nut 100 lb-in 11 Nm

Spark Plug 240 lb-in 27 NmValve Cover 100 lb-in 11 Nm

Fastener Torque Specs

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Description Standard Dims. Reject Dims.

Cylinder

Mag Bearing Ball Bearing N/A

Bore out-of round N/A .04 mm

Cam Bearing 14.00 mm 14.08 mm

Cylinder Head

Intake and Exhaust

Valve Guide 5.50 mm 5.58 mm

Valve Stem Diameter 5.48 mm 5.40 mm

Crankcase Cover / Sump

PTO Bearing Ball Bearing N/A

Cam Bearing 14.00 mm 14.08 mm

Crankshaft

Crankpin Journal 25.98 mm 25.92 mm

Mag Journal 21.98 mm 21.92 mm

PTO Journal 21.98 mm 21.92 mm

Cam Shaft

Mag Journal 13.98 mm 13.92 mm

PTO Side Journal 13.98 mm 13.92 mm

Connecting Rod

Crankpin Bearing 26.02 mm 26.07 mm

Piston Pin Bearing 13.02 mm 13.05 mm

Piston Pin

Diameter 13 mm 12.97 mm

Piston / Rings

Pin Bore 13.02 mm 13.05 mm

Ring End Gap - Top .23 mm .76 mm

Ring End Gap - Middle .23 mm .76 mm

Ring End Gap - Oil .46 mm .76 mm

Ring Land Clearance- Top .05 mm .10 mm

Ring Land Clearance - Middle .05 mm .10 mm

Ring Land Clearance - Oil .10 mm .15 mm

Starter Rope

Rope Diameter #4 White, (3.18 mm) N/A

Rope Length 178 cm N/A

Standard and Reject Dimensions

BRIGGS & STRATTON CORPORATIONDistribution Sales & Customer Support

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