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#1
06-06-2025, 02:57 PM
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RZT-SX 50 Engine Run Problems
Hi there,
I'm looking for some advice / guidance on troubleshooting my mower. I'm also wondering if my issues are common with other similar mowers. I have a 2020 RZT-SX 50 with an EFI Cub Cadet engine, model #17AWCBYZ596. It has frequent issues with starting when the engine is cold. When this occurs, the engine also has trouble staying running for the first 5 or so minutes. It feels like a carbureted engine with poor tuning, improper choke setting or fuel starvation. This is a fuel injected model with no individual choke control. When the engine is difficult to start, it will often stall with no warning even after an hour of use. When it stalls like this, it is often very difficult to restart. Other times, the engine fires right up without issues and works perfectly. The digital display has never shown any codes. The machine currently has 39 hours and has had these issues since I bought it last year with 27 hours. I initially assumed it had old gas since it would eventually run, but new gas and fuel system cleaner hasn't corrected the problems. The engine also always cranks over, just sometimes doesn't fire up or stalls immediately after firing up. I've checked the basics like looking for a clogged air filter, clogged gas tank vent, clogged fuel strainer, loose fuel line hose connections, sticky throttle & governor linkages, fouled spark plugs, poor grounds, loose connections but all of those where found to be in good order. Another issue that may or may not be connected is that the headlight inconsistently strobes when the engine is running. When the engine is off, the headlight stays continuously lit as it should. I've removed the headlight and tested it using a 12V battery and it worked fine. While I was at it, I checked the continuity of the harness and it was also fine. Just to make sure it wasn't a loose connection, I ensured the connections were greased and tight but this didn't fix the issue either. Any help on resolving this would be greatly appreciated. 
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| hard start, headlight, rzt-sx, stalls |
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.
MTD Products, Inc. of Cleveland, Ohio purchased the Cub Cadet brand from International Harvester in 1981. Cub Cadet was held as a wholly owned subsidiary for many years following this acquisition, which allowed them to operate independently. Recently, MTD has taken a more aggressive role and integrated Cub Cadet into its other lines of power equipment.
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