When a carburetor is clean and is working properly, the engine should start easily, idle smoothly, and accelerate without stumbling. Signs that it's time to replace your carburetor include hard starting, stalling, rough idling, and flooding. This fuel efficient Carter style BBD 2-BBL 1 1/4 inch carburetor from Omix-ADA helps restore engine efficiency so it'll run smoothly for years to come.