I have a Craftsman DYT 4000 that runs fine, but only when I push the thorttle into the choke a little. When I just run on full throttle without the choke, it revs up and down and backfires. At first I thought it was my air filter so I took it off to see if it would run right, but no change. Any ideas would be greatly appreciated. Thanks.
You will have to take it apart and clean it really well, expecially the jets and all passages, Most notibly the idle circuits in the carb which is what usually causes the surging when it is partially clogged.
I 'm having problem with the tractor bogging down at full throttle and engaging the blades , runs fine as long as you don' t engage the mower deck , has anyone out there have or had this problem ?
you might be crossing over at full throttle to choke with the cable being slightly off. Keep it in the run fast area without crossing over to choke. Your deck may need cleaning, or you may have a belt off and stuck creating drag on the engine.
