Question about Garden

1 Answer

Hi, my ST 30 Kubota was running fine, went to start it and it over revved, blowing black smoke, but stopped when the key was turned off. I suspect a stuck rack but don`t know how to get at it. Help! Robbo

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 12,061 Answers

Hi, if it blew black smoke overreved and then was stopped suddenly, most likely then you have broken one or more "Rings" i would expect.
To do anything with these units, one simply must obtain a shop or service manual, one cannot service nor repair without the reference contained in the manual, not to mention the parts numbers, needed to obtain spare parts too.
Also inside these manuals, ate all the relevant troubleshooting steps that you need to take to isolate and then repair your problem.
The first thing to check, is the throttle make sure it is working OK, it may simply have been stuck, and simply need, lube, & a few good opening and closing of the throttle a number of times, then try starting up again, a little high revving and black smoke, can be Ok if just in the initial startup.... but if it is throttle jammed wide open, well then no.. however sometimes a motor will cough up black smoke for a bit, as it starts, it sort of "Clears it's throat" so to speak.. this may/should settle down once it all warms up... but generally as related, it means that the Oil is able to get by the rings, and up into the combustion chamber, and hence the black smoke, usually indicating worn, or broken rings.. which need to be checked. > ... > Home Repair
Above are three DIY self help small motor repair for your info i am sure they will all help.

Posted on Nov 13, 2010

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My Kubota BX2200 will not run it will run fine if you hold the key to start but when you let it go to on it stops running

Sounds like the fuel shutoff solenoid. cost around $!50 for the part.
Whats happening is when you turn it over the solenoid is holding the pin and when you let go of the key the solenoid is releasing the pin and shutting off the fuel.

Hope this helps

Apr 17, 2015 | Kubota Garden

1 Answer

I recently bought a 1995 kubota m5400 tractor, when i got it it wasnt running. i put a new battery in it and attached the postive and negative wires to it and bam it started right up. i drove it around the...

As it went for a period of time I suspect that the fuel system has a problem. I take it that it is a diesel being a kubota. When diesel sits unused for a period of time gunk grows in the fuel tank. I suspect that this gunk has now blocked the fuel filter or that there is air in the system that has to be bled out. I would also check that the stop solenoid on the fuel pump is working to allow it to start.

Nov 12, 2014 | Cars & Trucks

1 Answer

Black smoke

May have a choke setting that it only needs at start up.

May 02, 2014 | Air Conditioning Orifice Tube 2004 Isuzu...

1 Answer

Last weekend my wife mowed on Friday evening and she says tractor ran fine, I went out Saturday morning and tried to start it and it made a banging noise and started backfiring and blowing black smoke, it...

Black smoke would indicate it is burning oil, Has the machine been working on an incline.? check valve clearences. My guess is that oil is somehow getting into the cylinder.

Jul 30, 2013 | Craftsman Garden

1 Answer

Honda GX 160 under 30 hrs from new, is running poorly

try removing the float bowl on the carburator and cleaning, sounds like needle valve is partially stopped up

Aug 02, 2010 | Honda Horizontal OHV Engine for Non Pumps ...

1 Answer

Lawn mower running rough

adjust the carby. also u might want to replace the diaphragm in the carby. might work wonders

Mar 31, 2010 | Mtd LAWN MOWER PART # 791-180705 Assembly,...

1 Answer

My 21 HP diesel zero turn mower starts blowing black smoke after running at higher throttle settings and temp gauge shows engine is warm. No air restrictions. New fuel filters. smooth running when cool or...

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.

Sep 28, 2009 | Garden

2 Answers

Kubota kh 91 excavator, blowing lots black smoke

If the Air filters are NOT restricted in any way and it's not skipping ( indivual cylinder problem ), check the small return line coming from the injectors going to tank for blockage. This will be a small line probably held on with a worm gear clamp. Good luck

May 06, 2009 | Garden

2 Answers

Engine runs wild with white smoke

If its a 4JX engine then its injectors and seals at fault dont run it any more cos it may blow up - like rods through the side !
The diesel is going straight into the engine without being injected and as the fuel lift pump is mechanical it wont stop on the key .
Should be under isuzu warranty though they are doin that repair on 1998 Troopers over here for free .

Apr 04, 2009 | 2002 Isuzu Trooper

Not finding what you are looking for?
Garden Logo

Related Topics:

413 people viewed this question

Ask a Question

Usually answered in minutes!

Top Garden Experts

Dennis Key
Dennis Key

Level 3 Expert

2478 Answers

john h

Level 3 Expert

12104 Answers


Level 3 Expert

75807 Answers

Are you a Garden Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides