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I have a 18hp briggs. spark plug has fire airfilter is clean…

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i have a 18hp briggs...
i have a 18hp briggs. spark plug has fire airfilter is clean and getting fuel but wont start and the starter gets really hot fast. engine is brand new out the box
Submitted: 2 years ago.Category: Small Engine
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2/22/2016
Technician: Donald, Small Engine Technician replied 2 years ago
Donald
Donald, Small Engine Technician
Category: Small Engine
Satisfied Customers: 2,591
Experience: I have 25+ years of experience repairing 2 & 4 cycle engines
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Hello and thank you for choosing Just Answer. My name is***** will be happy to assist you. What type of equipment is your engine mounted on?

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Customer reply replied 2 years ago
z225 john deere zero turn mower. the original engine burnt up so i got a new one model #31N707. It has fire, fuel, and air. It pops like it wants to start and occasionaly backfires out of the intake.
Technician: Donald, Small Engine Technician replied 2 years ago

Have you checked to see if the fuel solenoid on your carburetor is clicking, after you turn your ignition switch on?

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Customer reply replied 2 years ago
i have and it is functioning properly.
Technician: Donald, Small Engine Technician replied 2 years ago

If you have some carburetor cleaning in a can, spray a small burst directly into your carburetor, to see if your engine will start up briefly.

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Technician: Donald, Small Engine Technician replied 2 years ago

Keep in mind that an engine needs three things in order to run. Spark, Fuel, and Compression. You have confirmed spark and fuel.

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Customer reply replied 2 years ago
i pulled the spark plug and sprayed starter fluid directly in the cylinder and all it did was pop when i cranked it. i had to rob the flywheel and all the elect. components (stater, regulator, etc.) i know it has the 3 things it needs to run. its brand new out the box. im a mechanic myself but this one has me stumped
Customer reply replied 2 years ago
i had to take those parts off of the old engine for this one to have enough "juice" to engage the pto. another thing, it doesnt take long for the starter to get extremely hot and the battery to die
Customer reply replied 2 years ago
is it possible for something electrical (flywheel, staiter, coil) to be bad or not installed properly and still have spark?
Technician: Donald, Small Engine Technician replied 2 years ago

I am back now. I had to reboot my computer.

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Technician: Donald, Small Engine Technician replied 2 years ago

You stated that your starter gets hot. Does your engine seems to be dragging as it spins?

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Technician: Donald, Small Engine Technician replied 2 years ago

You also mentioned that your engine pops, and sometimes backfire out of your intake. I would double check your flywheel key, just to be sure, due to the fact that you changed out your flywheel.

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Customer reply replied 2 years ago
what should i look for on the flywheel? im sure the key is there. and yes the motor seems to have some drag like its not turning fast enough to start
Technician: Donald, Small Engine Technician replied 2 years ago

I would like to ask you a troubleshooting question.

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Technician: Donald, Small Engine Technician replied 2 years ago

How did you prevent your flywheel from spinning, as you were tightening the flywheel nut/bolt?

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Customer reply replied 2 years ago
i used a pneumatic impack to tighten it
Technician: Donald, Small Engine Technician replied 2 years ago

Thanks for this information. Can you double check to see if your flywheel key is partially sheared.

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Technician: Donald, Small Engine Technician replied 2 years ago

This will give you and me a good starting point.

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Customer reply replied 2 years ago
the flywheel key is in tact. are you thinking the flywheel is occasionaly "free spinning"?
Technician: Donald, Small Engine Technician replied 2 years ago

It appears that your timing could be off. Many times when an engine spins with excessive resistance, the problem is caused by a sheared flywheel key, or your valves being out of adjustment.

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Technician: Donald, Small Engine Technician replied 2 years ago

Did you change out your flywheel, stator, regulator, etc., to keep your wiring the same?

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Technician: Donald, Small Engine Technician replied 2 years ago

Ok ...

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Technician: Donald, Small Engine Technician replied 2 years ago

I would like to make a suggestion to you.

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Customer reply replied 2 years ago
ill take any suggestion at this time haha
Technician: Donald, Small Engine Technician replied 2 years ago

Thanks. Use your impact wrench to remove your flywheel nut/bolt, and let's be sure your flywheel key is not partially sheared. If your flywheel key is ok, I would like to have the model and type numbers from your old engine. I would like to compare the two flywheels.

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Technician: Donald, Small Engine Technician replied 2 years ago

You can also look closely at both flywheels, to see the keyways, and magnets are positioned the same on both.

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Customer reply replied 2 years ago
ill do that to be sure. theres a part # ***** on the inside of the flywheels and there identical.
Technician: Donald, Small Engine Technician replied 2 years ago

If both flywheels are identical, we will focus on your flywheel key for now. I will be here to work with you until 10:00 pm central time tonight. There are no additional fees for us to continue.

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Customer reply replied 2 years ago
im shutting it down for the night and will check the flywheels tomorrow when i can get a puller. is there any additional fees if we do this again tomorrow?
Technician: Donald, Small Engine Technician replied 2 years ago

There is not a time limit on your question. We can continue tomorrow, and continue until your engine is running, at no additional fees. Take your time. We will figure it out.

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Customer reply replied 2 years ago
thanks. i hope we do before my grass gets too tall haha
Technician: Donald, Small Engine Technician replied 2 years ago

You are very welcome! We will get it done in time for you to beautify your lawn.

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Technician: Donald, Small Engine Technician replied 2 years ago

Wait until we are finished, before you leave a rating ...

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Customer reply replied 2 years ago
i put the new flywheel on and it started first crank. im good to go
Technician: Donald, Small Engine Technician replied 2 years ago

Very good! Thank you for letting me know. I am glad you got your engine up and running.

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