Question about Craftsman 21 Hp 42" Deck, Ys 4500 Lawn Tractor

1 Answer

18 HP tractor cranks but will not start

I have an 18 HP Craftsman tractor that will not start. The B&S engine cranks, but freewheels w/o starting the engine. The engine seems to spin extremely fast, and the engine pulley spins as intended. It was worked fine one day and the next day would not start. The battery, air filter, and spark plug were all checked. Thank you, Rick

Posted by on

  • rlzpenny Jul 16, 2009

    Thank you, yes it did lose compression.

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,129 Answers

It sounds like you lost compression take out the spark plug and screw in a compression tester to check for engine pressure there should be 70 - 90 psi, if you can't buy one put you thumb over the spark plug hole and have a assistant crank over the engine push on the hole pretty hard, be careful not to get a shock from the spark plug wire while cranking the motor, if you feel pressure with your thumb reinstall the plug and connect the spark plug wire proceed to remove the air cleaner and pour a small amount (1 o.z ) of gas into the carburetor hole then try to start if it starts then stalls it is a fuel delivery issue. unscrew the carb float bowl to clear out any water or debree from it. the float bowl is round and is located on the under side of the carb, it should un screw by wraping a rag around it and turning it counter clockwise with a strong hand. also try cranking over the motor with your hand over the carb intake hole this will force any debree to get cleared out of the tiny passages in carb without having to full disassemble the carb this may also get the motor started for you if it starts remove your hand to allow the motor to breath and start/run.

Posted on Jul 16, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

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

Hi,
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.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

What is the the compression lbs for 18 hp intek brigg and stratton engine


you should see at least 60 psi but 90 is better... do to the compression release mechanism if the engine cranks slow you might not see anything above 60...

Aug 18, 2014 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

1 Answer

18.5 hp lawn tractor will not turn over when on compression stroke . If you move it a little by hand past compression stroke it will start.


Sounds to me that you have a weak battery and is not putting out enough cranking amps..Takes more cranking amps during compression strokes to start than in down stroke...That is why you are able to start it in the down stroke less amps needed to turn motor over..

Jun 28, 2014 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

1 Answer

Craftsman Intek Plus 18 HP engine won't crank


Adjust the valves. I had the same problem.

Jun 15, 2013 | Craftsman Garden

1 Answer

Wheels are locked cannot move in neutral


If, t's a Craftsman You might can go to rear of your Mower and Release the Freewheel Control Level.

Nov 11, 2011 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

2 Answers

My Craftsman 21 Hp 42"


check the soleniod with the key on cross the cables out with a screw driver if it starts that way its a bet its the soleniod

Jul 26, 2011 | Craftsman 21 Hp 42" Deck, Ys 4500 Lawn...

1 Answer

I have a craftsman 22 hp zero turn,it just cranksover and doesn't start. Thier is good spark at both plugs, I have zero comprssion.I guess this engine has some sort of compression release. Does this engine...


Is there a wire going to the bottom of the carb? If so this is an electronic shuttoff. cycle the key on & off and listen if you can hear it click. If it does not you will not get any gas to carb to start it. Replacement part is not cheap. Most units do pull gas into engine as it turns over.

Dec 17, 2010 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

3 Answers

Craftsman lawn tractor 917.271060w/kohler 15.5 hp engine cranks but backfires thru carb and wont start.


my 15 hp kohler engine backfired while i was using it, now it wont crank and backfires thru carb

Oct 10, 2010 | Craftsman Garden

Not finding what you are looking for?
Craftsman 21 Hp 42" Deck, Ys 4500 Lawn Tractor Logo

589 people viewed this question

Ask a Question

Usually answered in minutes!

Top Craftsman Garden Experts

Dean Gruber

Level 2 Expert

110 Answers

Roland W VanLue
Roland W VanLue

Level 3 Expert

486 Answers

Dennis Key
Dennis Key

Level 3 Expert

2475 Answers

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

Answer questions

Manuals & User Guides

Loading...