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M-Series

  • Briggs & Stratton | M-Series | Racing Engine

Primary Use: Quarter Midgets

Building off of the proven success of the Animal engine, the M-series is the first dedicated racing engine engineered to meet the needs of the Quarter Midget market.  Right out-of-the-box, the M-series is focused on the consistency, and simplicity that racers deserve.  Each engine is assembled by hand and tested in Milwaukee, Wisconsin with the craftsmanship and quality we stand behind.

Specifications
MODEL/TYPE(S)124332 8203-012017 M.A.P. Price$599.99Horsepower/Torque8.8 hp/10 ft. lbs. torque*
Displacement204ccBore/Stroke2.6875”/2.6885”Compression Ratio8.5 to 1
Rpm–Digitally Limited6,100 RPMFactory Timing29 degrees BTDCFuel Type87 Octane

Documents

Engine Cad File
CAD DRAWING - DOWNLOAD NOW

RACE ONLY FEATURES

  • Reinforced, Cast Iron Sleeved, Dual Ball Bearing RACING cylinder
  • Single cast, custom aluminum alloy cylinder head with high-flow intake port, custom seat/guide material
  • Squeeze cast, T-7 het treated aluminum rod with reinforced I-beam
  • Carbon steel crankshaft with Induction hardened micro-polished crankpin reinforced timing gear and hardened splined output shaft for 6-1 gearbox (555721)
  • Custom top control plate firewall clearance
  • Cam ground, barrel faced, eutectic alloy piston with 3 piece ring set with chrome faced top ring
SHOW MORE FEATURES
  • High silicon racing engineered valve springs for seasons of racing
  • High grade stainless steel, dished valves with nitrited exhaust
  • 3-piece automotive style keepers and reinforced rocker arm and lock ball
  • PVL Digital ignition with built in 6,100 rpm rev limiter
  • PVL steel hub, cast aluminum flywheel
  • Briggs & Stratton tooled 22mm round slide, fully adjustable jet carburetor
  • Custom graphoil composition head gasket

Fastener Torque Specs
DESCIPTION WRENCH / SOCKET SIZE TORQUE
Air Guard 7 mm 40-50 lb-in. (4.5-5.6 Nm)
Blower Housing 10 mm & 3/8” 60-110 lb-in. (7-12.5 Nm)
Carburetor (to manifold) 10 mm 80-110 lb-in. (9-12.4 Nm)
Connecting Rod 5/16” 125-135 lb-in (14-15 Nm)
Cylinder Head Bolts 10 mm 200-220 lb-in. (20-27 Nm)
Exhaust Brace Screws 10 mm 95-125 lb-in. (11-14 Nm)
Exhaust Stud 10 mm 95-125 lb-in. (11-14 Nm)
Flywheel Nut 15/16” 55-75 ft-lbs. (74.5-101 Nm)
Flywheel Fan 10 mm 180-240 lb-in. (20-27 Nm)
Intake (to cylinder) 5 mm Allen 70-90 lb-in. (8-10.2 Nm)
Oil Drain Plug 3/8” 100-125 lb-in. (11-14 Nm)
PVL Ignition Module 7 mm 20-35 lb-in (2.3-4 Nm)
Rocker Arm Stud 7/16 90-120 lb-in. (10-14 Nm)
Rocker Arm Set Screw 1/8” Allen 50-70 lb-in. (5.6-7.9 Nm)
Spark Plug 5/8” deep 95-145 lb-in. (11-16.4 Nm)
Side cover 10 mm (patched, grade 8.8)
10 mm (unpatched, grade 8.8)
10 mm (patched, grade 10.8 )		 215-230 lb-in. (24-26 Nm)
160-175 lb-in. (18-19 Nm)
260-270 lb-in. (29-30 NM)
Top Control Cover 10 mm 70-90 lb-in. (8-10 Nm)
Valve Cover 10 mm lower & 3/8” 30-60 lb-in. (3.5-7 Nm)

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