42031201610 Carburetor replacement for Stihl BR340 BR380 BR420 BR420C SR340 SR380 SR420 backpack blowers. Direct replacement for Walbro HD28A HD29 HD45 carburetors. Designed to restore proper fuel and air metering for reliable engine operation. Key benefits Restores starting, idling, and throttle response by replacing a worn or clogged carburetor. Directfit compatibility with listed blower models for faster, straightforward . Replaces common Walbro carb models HD28A HD29 HD45, making it suitable for many standard service situations. Helps avoid downtime for equipment used in landscaping, property maintenance, or rental fleets. What it does Controls the correct fuel and air mixture for twostroke backpack blowers, supporting consistent performance across load and throttle changes. Functions as a likeforlike replacement to maintain factory fit and basic operating characteristics. Compatibility Fits backpack blower models BR340, BR380, BR420, BR420C, SR340, SR380, SR420. Replaces Walbro carburetor models HD28A, HD29, HD45. Model number: 42031201610. Practical applications Onsite for a commercial landscaper whose blower will not idle or is hard to start. Seasonal maintenance for homeowners preparing leaf and debris cleanup equipment. Service replacement for rental fleet units to equipment to service quickly. Notes for use Intended as a replacement carburetor for compatible models only. Installation by a technician or a person familiar with small engine is recommended to ensure correct adjustment and safe operation. Check compatibility with your blower model and existing parts before . This carburetor provides a focused replacement option for restoring reliable operation of compatible backpack blowers and keeping equipment running when a worn carburetor is the cause of performance problems.