Briggs & Stratton 276535, Repair Manual

Page: 9 / 38

2-Cycle Snow Engine
Section 1 - General Information
Page 3
At slower speeds, the flywheel magnet induces a smaller
charge in the trigger coil. This action triggers the (SCR),
enabling easier starting in a “retarded firing position”
-about 5° before top dead center (BTDC). See figure 8.
Fig. 8
At faster speeds (about 800 RPM), the flywheel magnets
induce a large enough charge in the trigger coil to trigger
the SCR in the “advanced firing position,” -about 28°
BTDC (Figure 9).
Fig. 9
REWIND STARTER
The rewind starter operates through a retainer/friction
disc and two engagement dogs that extend from the
center of the rewind starter and engage the inside of the
starter hub on the flywheel. The engagement dogs
contact the starter hub when the rewind rope is pulled.
When the engine starts, the starter cup exceeds the
speed of the recoil starter causing the ramps on the
inside of the cup to contact the back side of the starter
dogs, pushing them inward. When the starter rope is
relaxed, spring tension retracts the dogs.
ELECTRIC START (OPTIONAL)
The electric start models use a 120VDC starting system.
When the starter is supplied with voltage, the helical
shaft spins to force the pinion gear out on the shaft and
engage the ring gear (Figure 10).
Fig.10
RECOMMENDED MAINTENANCE
SCHEDULE
25 Hours
• Clean/replace or re-gap spark plug
50 Hours
• Clean exhaust ports
• Check for fuel leakage
Pole Shoe
Flywheel Rotation
Crankshaft at 5° BTDC
Magnet
Starting Leg
Charging Leg
Pole Shoe
Flywheel Rotation
Crankshaft at 25° BTDC
Charging Leg
Running Leg 25°
Advanced