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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 13581
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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Recently I bought a JD L120.Here is what what i know... the

Customer Question

Recently I bought a JD L120.
Here is what what i know... the person i got it from rebuilt 20 horse intex Briggs, one day started mowing our yard and it died, after time consuming hrs trying to figure out why here is what i have found..... got fuel, got spark..... Found problem is 1 rod was to lose and 1 was not even conected......put back together according to a video i watched and it still wont start.... what am i not seeing??
Submitted: 2 years ago.
Category: Small Engine
Expert:  Donald replied 2 years ago.
Hello and thank you for choosing Just Answer. My name is ***** ***** I will do my very best to get you the answer you need to your question.
I would like to confirm something. Are you referring to your push rods?
Customer: replied 2 years ago.
yes i am the filter side was lose and other side was completly off, brought to top dead center and backed off approx 1/4" on each cylender ( top ones only i did )
Expert:  Donald replied 2 years ago.
Thanks for this information. Do you have the model and type numbers for your engine? What valve settings did you use?
Customer: replied 2 years ago.
all i know is it a briggs & stratton 20 horse intex, In a JD L120
Customer: replied 2 years ago.
I used a 5mm I think thats what it was
Expert:  Donald replied 2 years ago.
Thanks! Is your engine a single cylinder, or a twin cylinder?
Customer: replied 2 years ago.
twin
Expert:  Donald replied 2 years ago.
Your settings are correct.
Expert:  Donald replied 2 years ago.
Will your engine start up briefly, if you spray some carburetor cleaner directly into your carburetor?
Customer: replied 2 years ago.
I have not yet tried that
Expert:  Donald replied 2 years ago.
Okay ...
Expert:  Donald replied 2 years ago.
I would like to ask you a troubleshooting question, just for confirmation.
Customer: replied 2 years ago.
is that what u want me to do now??
Cuz its 11pm here.
ask away i'll see if i can answer for what i have tryed
Expert:  Donald replied 2 years ago.
You can wait until tomorrow to try the procedure above.
Customer: replied 2 years ago.
ok... lets do questions for troubleshooting
Expert:  Donald replied 2 years ago.
You stated that from Top Dead Center, you backed your pistons off 1/4" on each cylinder. Are you saying that you spun your flywheel in the opposite direction from TDC?
Customer: replied 2 years ago.
yes
Expert:  Donald replied 2 years ago.
If you are turning your flywheel clockwise to achieve TDC, you will need to continue turning your flywheel clockwise, until your piston is 1/4" past TDC, on your Compression Stroke ( Both Valves Closed).
Customer: replied 2 years ago.
Both valve closed.... meaning both springs fully extened?? Do they extend at same time? or differant?
Expert:  Donald replied 2 years ago.
On your compression stroke, both valve should be closed at the same time.
Customer: replied 2 years ago.
closed... meaning fully extened or fully compressed??
Expert:  Donald replied 2 years ago.
Fully extended ...
Customer: replied 2 years ago.
I seem to recall both fully extened but i went backwards for that 1/4"....
Expert:  Donald replied 2 years ago.
Actually you should continue forward, rather than backwards.
Customer: replied 2 years ago.
I'll give that a try tomorrow and see what happen....
Is there any other options for me to look at??
Expert:  Donald replied 2 years ago.
Keep in mind that your engine need spark, fuel, and compression in order to run. You stated that your engine does have spark and fuel. Let's begin by double checking your valve clearances. After you are certain that your valves are properly adjusted, try starting your engine again. If your engine still does not start, try spraying a small burst of carburetor cleaner directly into your carburetor.
Expert:  Donald replied 2 years ago.
If you have a compression tester, check the compression on both cylinders. Let's see if the results are equal.
Customer: replied 2 years ago.
the video i watched said between 4 & 6,,,, what would you recommend??
Expert:  Donald replied 2 years ago.
.005" will work for you.
Expert:  Donald replied 2 years ago.
Please take a look at the attachment.
Customer: replied 2 years ago.
k..... thats what i used.... i will work on it tomorrow and see how things go.... I will let you know......Is it ok to leave this window open on my end?? and will i be able to send you a message sometime tomorrow?
Expert:  Donald replied 2 years ago.
Yes, we can continue tomorrow. I am not sure of the time I will be online, but I will respond to you, as soon as I can. Wait until we are finished, before leaving a rating.
Customer: replied 2 years ago.
I will be out working on it some what early tomorrow morning
Have a good nite/day where ever you are from... I am from Minnesota.
Expert:  Donald replied 2 years ago.
I am in Texas (central time). I hope you have good as well.
Customer: replied 2 years ago.
well least we are on same time zone... chat later
Expert:  Donald replied 2 years ago.
Absolutely!
Customer: replied 2 years ago.
Good afternoon I have spent some time working on my JD L120 this morning have been unsuccessful at getting it to run,,,There was something more inside that i am not capable of doing myself, so i took it in to get fixed. I Thank you for ur time