6.75 B&S Quits running after 20 minutes, why? - Lawn Mower Forums : Lawnmower Reviews, Repair, Pricing and Discussion Forum
Lawn Mower Main Forum This is the main MyLawnMower Forum discussion forum. Here you can discuss the latest lawnmowers, and other lawn care machinery.

 
LinkBack Thread Tools
post #1 of 5 (permalink) Old 07-31-2019, 10:15 AM Thread Starter
Junior Member
 
Join Date: May 2016
Location: Parkersburg, WV
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
6.75 B&S Quits running after 20 minutes, why?

Changed almost everything - coil, carburetor, gas cap, spring for automatic choke. ONLY thing I did not change was spark plug.


Here is problem - the engine starts fine and runs for about 20 minutes then shuts down and will not start again until it cools, then the process continues.


HELP!!!!!!!!!!!!!
Joedaddy is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 08-02-2019, 03:11 PM
Junior Member
 
Join Date: Jul 2019
Posts: 5
Thanks: 0
Thanked 1 Time in 1 Post
Has to be a fuel delivery issue. The float bowl is using more gas than it is getting. Possibilities: plugged fuel line, leaky fuel line, plugged fuel tank or gas cap not venting properly. IMHO
Rickster55 is offline  
The Following User Says Thank You to Rickster55 For This Useful Post:
wh55 (08-04-2019)
post #3 of 5 (permalink) Old 08-02-2019, 05:32 PM
Senior Member
 
Join Date: Apr 2015
Location: New Lenox, Il
Posts: 228
Thanks: 13
Thanked 49 Times in 40 Posts
Do you have an inline spark checker to see if the coil is overheating and losing spark when it dies? Even NEW coils can go bad.


Could also be a fuel problem as suggested OR a faulty gas cap vent.

Experience is something you don't get until just after you need it.
Grunt is online now  
The Following User Says Thank You to Grunt For This Useful Post:
wh55 (08-04-2019)
Sponsored Links
Advertisement
 
post #4 of 5 (permalink) Old 08-07-2019, 02:05 PM Thread Starter
Junior Member
 
Join Date: May 2016
Location: Parkersburg, WV
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
fuel delivery is fine, new carburetor new fuel lines, bowl is fine, remember this happens after about 20 minutes after it has been running. I think it is related to heat. Remember I have change the following, with NEW - coil, carburetor, gas cap, spring for automatic choke. I have yet to try the spark plug.

I have yet to check with a spark tester.
Joedaddy is offline  
post #5 of 5 (permalink) Old 08-10-2019, 09:24 PM
Junior Member
 
Join Date: Jul 2019
Posts: 5
Thanks: 0
Thanked 1 Time in 1 Post
Just for the **** of it, crack the gas cap and see if the problem goes away. As far as heat is concerned - unless the fins of your machine is clogged with grass and whatnot, should not be an issue. I'm still not convinced it's not fuel related but......
Rickster55 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Lawn Mower Forums : Lawnmower Reviews, Repair, Pricing and Discussion Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome