OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Briggs & Stratton Engines Briggs&stratton engine

Hi,new to the forum, i picked up this rover lawn mower non goer,had been sitting for a long time.it had spark and compression i pulled down carby(flo jet) and found stale fuel and gumed up. Fuel tank was same.so cleaned up both.engine now running.
There was no decals on the mower to indicate what size/type the engine is.
Numbers stamped on engine cover are
121702 018501 91072956,hoping someone can give me more info on this engine
Thanks ps went to file manager to add photo just wasn't working for me

its manufactured July 29, 1991. HP was around 4.5 but Briggs didn't post those specs.

SKU 121702-0185-01
Technical Specifications

Model Series 1217
Engine Series 600
Displacement 205
Oil Capacity 20 oz (0.6 l)
Valve Configuration L-head
Flywheel Torque 55 lb/ft (74.5 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 .005-.007 in (.13-.18 mm)
Exhaust Valve .007-.009 in (.18-.23 mm)
Idle Speed 1750
Air Gap .006-.010 in (.15-.25 mm)
Flywheel Puller Part 19069
Flywheel Holder Part 19433
Connecting Rod Torque 100 lb/in (11.5 Nm)
Sump Torque 85 lb/in (9.5 Nm)
Head Torque 140 lb/in (16.0 N

G'day AVB,
Thank you for your reply,
the info is most useful, one other thing you may be able to answer, when i was working on this motor i noticed i could move the fly wheel up and down how much end play is acceptable on these motors?

Per service manual it is .002 – .030” (0.05 – 0.76 mm) for 120000 series side valve engines. Now there are shims that could be used when the play was excessive.

• 220624 .0625 thrust washer for .875” (22.23 mm) dia. crankshaft.
• 220708 .0625 thrust washer for 1.000” (25.4 mm) dia. crankshaft.
• 222949 .062 thrust washer for 1.181” (30.0 mm) dia. crankshaft.
• 222951 .062 thrust washer for 1.378” (35.0 mm) dia. crankshaft

thanks once again