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I got this craftsman mower with a chinese engine on it (420 CC) and changed the carb on it, now when i engage blades, it shuts off on me. I took the belt off of the engine spindle and turned the blades on and the engine didn’t shut off so it’s not a safety issue. i spun the blades with my hands and they seemed to spin freely. idk what it could be any ideas?

model is 247 203700

Does it fall on it's face or does it begin to die slowly like it cant recover from the sudden load of the blade action ?
Most of these you need to rev up almost full throttle when engaging the blades

247.203700 (13A277XS099) - Craftsman T1000 Lawn Tractor (2014) with a 4P90HU engine.​

What was wrong with the mower before the carburetor change?

Is the replacement carburetor an OEM or a clone? Clones are known for their problems. And I even had an OEM this year to come in defective.

Also when checking the deck did you check the two idlers pulleys for freedom of movement. IE bearing might be froze in one.

Bertrrr said:

Does it fall on it's face or does it begin to die slowly like it cant recover from the sudden load of the blade action ?
Most of these you need to rev up almost full throttle when engaging the blades

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even when i engage the blades slowly at full throttle it still dies. if i choke it up fast enough it will stay running

Do you have an electric PTO or is it manually engaged ?

Bertrrr said:

Do you have an electric PTO or is it manually engaged ?

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it is manually engaged

Look at the governor linkage and make sure it's free and not binding , it sounds like if you choke it quick enough it keeps running so I'd think maybe the governor is not reacting quick enough or you may have a carburator problem. Has this gotten worse over time or all of a sudden doing this ?

If the carb has a low speed mixture screw, richen it up a bit. Just to test, partially choke it while you engage the blades.

Bertrrr said:

Look at the governor linkage and make sure it's free and not binding , it sounds like if you choke it quick enough it keeps running so I'd think maybe the governor is not reacting quick enough or you may have a carburator problem. Has this gotten worse over time or all of a sudden doing this ?

Click to expand...

with the old original carb it had no issues apart from running a little rough and having a slight surge

Fish said:

If the carb has a low speed mixture screw, richen it up a bit. Just to test, partially choke it while you engage the blades.

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which way is to richen it up?

I'd clean the old original carb really good and re install to see what difference it makes

make sure the governor is working
With the engine stopped to throttle butterfly should be wide open and close down as the engine speeds up
On a lot of the clone carbs the throttle butterfly can be hooked up so pulling can either open or close the throttle butterfly
Also make sure the governor spring is in the right holes
The governor always tries to CLOSE the throttle butterfly and it works against the governor spring which it attached to your throttle control so the engine speed is maintained as a tug-O-war between the governor & this spring
Different carbs often require different ( in your case stronger ) springs .

Did you happen to remove any wiring? Almost sounds like the seat switch is disconnected.

Turn CCW