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1. Remove carburetor heater box; use Starting and Stopping Instructions, paragraph one, steps A & B page 10. IMPORTANT: Do not close power adjusting screw too Toro 521 Snowthrower Operator's Manual · 1. Push high tension wire onto spark plug (Fig. 15). · 2. Move throttle to FAST (Fig. 14). · 3. Open fuel shut-off valveTO START ENGINE: Note: (Model 521 only) If engine is operated when temperature is +40° F (4° C) or higher, remove carburetor heater box (Fig. 15). However, the