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#1
08-21-2025, 01:56 PM
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RZT-SX46 won't start
I have a RZT-SX46 that was working, then died while cutting grass. Model is 17RWCBYN010 date of manufacture is 08/21, SN 1H26MH10050. It has a MTD679cc EFI engine. It has about 321 hours
I have replaced the battery, hour meter, magnetic key, solenoid, ignition coils, and spark plugs. The engine will turn over, so I don't think it is one of the safety switches preventing it from starting. I checked the spark plugs and they are firing. I removed the fuel hose to the throttle body and cranked the engine, getting a lot of gas into the throttle body. The butterfly valve in the throttle body is open. Could one of the electrical connections on the throttle body be bad? How is the fuel distributed once it enters the throttle body? How is the fuel/air mix handled with a EFI? thanks 
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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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