Engine runs full throttle and won't throttle down

SOURCE: 2001 john deere saber briggs moter smell gas in oil

If you're using ethanol-blended fuel, the ethanol will eat away at the neoprene parts inside the Briggs carb.Going to need a carb rebuild.
Don't run your engine until it's fixed or you could damage it as gas will pour into the crankcase, causing the oil to thin and lose its lubricating ability.

SOURCE: my 21 HP diesel zero turn mower starts blowing black smoke

Looks like you've got a good idea on what makes diesels smoke, so I'm sure you know that black smoke is almost always from too much fuel for the air that's going in. So it can be too much fuel or too little air. If your filters are good, the next things to check are the fuel pressure and the injectors.

I know diesels, but I don't have any specific experience with lawn mowers (kubota?). Since it stalls eventually, it sounds like it's not a single cylinder (although not for sure) so I'd check injector pump first.

SOURCE: Zts has no Power when Blades Engaged

check the coils
I had the same problem 1 coil went out.
I replaced both to save time and money later

SOURCE: throttle control won't work after i cleaned the

Hi again Ed,
Starting at the carb throttle shaft, your linkage rod (with tiny spring wrapped around it) should be connected directly to the governor's arm. If there's more than one hole in the arm, connect the rod in the upper-most hole.
Now, at the base of the governor's arm is another hole (possibly on a tab jutting from the arm). The main governor spring should be hooked in this hole and then back to the sliding throttle control that moves when the lever on the dash is moved. (This one definitely has a tab and hole.)

The choke cable end hooks directly on the choke shaft and it has intuitive movement. Verify that the choke butterfly closes and opens relative to the cable control on the tractor's dash.

To insure that we only do this procedure ONCE, and we get it right the first time, let's set the internal governor to base-line at this time.

With everything bolted back up, move the throttle control lever on the tractor's dash to full throttle. Then get a 3/8 wrench and a slotted screwdriver and locate the round governor shaft coming out of the engine block. The governor arm attaches to this with a clamping-bolt. You will notice that the round shaft is slotted for a screwdriver as well.
Loosen the clamping bolt slightly with your 3/8 wrench, insert your screwdriver and rotate the round shaft clockwise until it stops. (It has VERY little travel, so turn it both ways to verify that your are at FULL clockwise position.)
Hold screwdriver there and move the governor's arm in the same (clockwise) direction until the carb's throttle is set to WIDE OPEN throttle. Still holding the screwdriver clockwise, retighten the clamping bolt with the wrench.
Next, move the throttle lever on the dash of the tractor to idle and back to full several times and observe the carb's throttle shaft, it should come down from full throttle to idle and back again freely.

Start the engine and be prepared to shut it off if it over-revs.
If it doesn't over-rev, your base-line settings are correct.

By bending the tab on the sliding throttle control (the one that has the main spring attached) you can now increase or decrease spring tension and change top speed of the engine. Do this in small increments and if you have a tachometer for single cylinder's set top speed to 3400-3600 RPM.

Sorry this is lengthy, but as mentioned above, we only want to do this once.

Hope this helps, and feel free to ask away if you need more info!
Dolf-

Testimonial: "thanks for the advice , i got the mower running well now. ed"

Bill Linda Rivard

• 197 Answers
• Posted on Nov 16, 2009

SOURCE: I have a 1988 318 John Deere garden tractor and it

If your rpm's are high/sluggish and slow reacting its do to your govenor inside your engine needing to be fixed.There is a plastic housing with fingers on it that will break and allowing metal balls to free float.Another problem with them is that the washer under the retaining ring will fail or loose tolerance,also located inside engine.