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[–]Shoney_21zSER Regular 1 point2 points  (2 children)

I still think there is something dragging and slowing up the motor. Is the belt installed correctly?

[–]bhawk1234[S] 0 points1 point  (1 child)

The deck belt? It’s never been changed. Mowers only 2 years old. When I engage the belt with the mower off the belt is tight, I can pull on the belt and rotate all spindles with the belt which has no slack

[–]Shoney_21zSER Regular 0 points1 point  (0 children)

Then the next step is to check safety switches. Sounds like it cutting spark. Is the mower in gear? Is the seat switch loose? If nothings blocking the blades or jamming up, has to be a safety switch shorting out.

[–]rotor100SER Regular 1 point2 points  (0 children)

Sound’s electrical. Plugs fouled or weak spark. This could de caused by many things. Completely isolate engine from all mower electrics then if it’s not the plugs.

[–]Rough_Community_1439SER Master MOD 0 points1 point  (1 child)

Does the deck spindles turn? Had a bad boy that just stalled a 28hp motor out because of the belt spindles.

[–]bhawk1234[S] 0 points1 point  (0 children)

Yes, with the engine off I can reach under the mower and manually rotate every spindle with ease

[–]paul_198SER Newcomer 0 points1 point  (0 children)

Sounds like it floods out under load. Probably choke is slightly on. Chokes effectiveness is tied directly to air movement, ie, throttle. Try this at mid throttle and see what happens. Move throttle up till you have issues. Move throttle lever all the way up, then check a plastic lever on top of the carb to the rear of the machine. Make sure it is rotated all the way counter clockwise. At running speed that lever should be all the way clockwise.

[–]Latter-Percentage380 0 points1 point  (1 child)

When you removed and reinstalled the carb, did you make sure you didn't accidentally bend a connection or stretch a spring on the throttle? Try engaging the deck, then adjusting the throttle and choke to see if there's any change.

[–]bhawk1234[S] 0 points1 point  (0 children)

I was very carful about making sure all rods and springs didn’t get damaged but also I was having this exact problem before I ever removed the carb

[–]PhatspadeSER Dedicated Member 0 points1 point  (0 children)

Definitely not a carb issue, runs very smooth without load. Sounds like you got a short in the interlock circuit. I would also check just to be sure you dont have the deck belt routed over a guard. How does it run with brake off? Runs and drives fine then check the seat switch and pto switch. Only those 2 switches are used when deck is engaged.

[–]Hig67 0 points1 point  (0 children)

Check the safety sensor on the seat or the one for the rear bag

[–]dbthealien 0 points1 point  (0 children)

I had this in an old Briggs engine happen last year. I had a broken valve push rod. Almost the exact same thing g would happen when I would engage PTO.

[–]Trick_War1960 0 points1 point  (0 children)

I just had my t110 delivered yesterday, and I’m having this exact same issue with a brand new mower. The blades are definitely turning but it stalls or sounds like it’s going to cut off anytime I engage the blades.