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Jul 6, 2023 #1
T
TeeTime71
Snapper P2187520 8.75 ft/lbs 190cc Professional Series with a Briggs and Stratton 12S902-0126-B1 and it heavily smokes on startup, more than normal. 15+ years old. Self-propel also quit working but that is a separate issue. On small engines such as this, what entails a "rebuild"? Carb kit?
Jul 6, 2023 #2
StarTech
Well if you don't already have the necessary tools it would cost more than a new to rebuild. Most shop now don't even rebuild these engines. Current direct replacement was 121S02-2025-F1 which is around $300 plus shipping but it is NLA. But the 190CC promo 125P02-0012-F1 (around $320 + shipping) is available.
Jul 6, 2023 #3
T
TeeTime71
Spoke to an out of state shop today (will be there next week and had my fingers crossed) and was told Snapper is out of the walk behind mower business. Local shop had no information. Murray purchased the name 10 years ago "and is not same company". I love the Hi-vac design.
Jul 6, 2023 #4
T
TeeTime71
Well if you don't already have the necessary tools it would cost more than a new to rebuild. Most shop now don't even rebuild these engines. Current direct replacement was 121S02-2025-F1 which is around $300 plus shipping but it is NLA. But the 190CC promo 125P02-0012-F1 (around $320 + shipping) is available.
What is the difference between the two engines? NLA I understand, just curious.
Jul 6, 2023 #5
StarTech
The main is the promo does not have an alternator or electric start capabilities. Engine Overview Information Model Number 121S02-2025-F1
Engine SeriesPROFESSIONAL
Replacement Engine Replacement Engine:121S02-2025
Crankshaft 796468
PTO Shaft Diameter0.984
PTO Shaft Length3.156
Woodruff Keys2x #605
PTO Threads0.375-24 UNF
Replacement Shortblock:798773
View Replacement Details
Engine Specifications Model Number121S02-2025-F1
Engine Specifications
Engine Fuel Gasoline Configuration Vertical Cylinders One SKU 121S02-2025-F1 Gross Horsepower* 875.00 Air Cleaner AIR CLEANER, DUAL ELEMENT OVAL Air Cleaner Cover AIR CLNR COVER, 290 SATIN BLAC Bearings BEARINGS, PLAIN PTO Blower Housing REWIND COVER, LS, 290 SATIN BLACK Bore Type Koolbore Bore Size 2.688 Stroke 2.040 Casing Clamps CASING CLAMP & SCREW, LOOSE Controls Groups CONTROL GROUP 82, MODEL Cylinder Head CYLINDER, ALUMINUM Dipsticks DIPSTICK, OPPOSITE CA Oil Drain OIL FILL, OPPOSITE Flywheel FLYWHEEL, LIGHT NON-ELEC START & NON-ALT Fuel System FUEL TANK, CIC, FUEL FRE Exhaust MUFFLER, PERFORMANCE W/TUB Spark Plug SPARK PLUG, RESISTOR Starting System STARTER, REWIND POSITION - 5:30 O'CLOCK
Technical Specifications
Model Series 121S Power Lbs/Ft of Torque 8.75 Engine Series 875 Displacement 190 Oil Capacity 20 oz (0.6 l) Valve Configuration OHV Flywheel Torque 60 lb/ft (81.5 Nm) Governor Arm Torque 40 lb/in (4.5 Nm) Carb Mount 40 lb/in (4.5 Nm) Plug Gap 0.02 in (0.50 mm) Intake Valve .003-.005 in (.08-.13 mm) Exhaust Valve .005-.007 in (.13-.18 mm) Idle Speed 1750 Air Gap .010-.014 in (.25-.36 mm) Flywheel Puller Part 19619 Flywheel Holder Part 19433 Connecting Rod Torque 100 lb/in (11.5 Nm) Sump Torque 100 lb/in (11.5 Nm) Head Torque 220 lb/in (25.0 Nm)
Alternator Specifications
Alternator 794103 Type DC Only Testing RPM 2800 DC Amps 0.5 adc
Engine Overview Information Model Number125P02-0012-F1
Engine Specifications Model Number125P02-0012-F1
Engine Specifications
SKU 125P02-0012-F1 Model/Type/Trim 125P02-0012-F1 Air Cleaner Dual Element Alternator Without Carburetor ReadyStart - Full System Casing Clamp Without Controls Fixed Speed Crankshaft Straight - 25MM 3.156" PTO Crankshaft Details 1/4" Keyway, 3/8-24 UNF-2B Emissions Certification EVAP/EXH/EU Engine Base Standard (Non Flange Mount) Engine Package High Debris Engine Sold In B&S Eng Replacement - USA/CAN Engine Speed 3100 +/- 0100 RPM - No Load Flywheel Light - Aluminum Fuel Cap Black 1/4 Turn Fuel Shutoff Without Fuel Tank EVAP - 1.0L Label Power 875 Professional Series,8.75TQ Muffler Guard Stamped Oil Dipstick Extended - Black Cap Oil Drain Plug Oil Filter Without PTO Bearing Plain Rewind Position 5:30
Technical Specifications
Model Series 125P Power Lbs/Ft of Torque 8.75 Engine Series 875 Displacement 190 Oil Capacity 20 oz (0.59) Valve Configuration OHV Flywheel Torque 60 lb/ft (81.3 Nm) Governor Arm Torque 30 lb/in (3.4 Nm) Carb Mount 60 lb-in (6.8 Nm) Plug Gap 0.02 in (0.50 mm) Intake Valve .004-.008 in (.10-.20 mm) Exhaust Valve .004-.008 in (.10-.20 mm) Idle Speed 1750 Air Gap .010-.014 in (.25-.36 mm) Connecting Rod Torque 97.5 lb/in (11.0 Nm) Sump Torque 110 lb/in (12.4 Nm) Head Torque 210 lb/in (23.7 Nm) Top No Load (rpms) 3100
Jul 6, 2023 #6
sgkent
As an alternative watch FB marketplace and CL for a similar mower that has a lower hour engine but needs maint, then use that engine.
