17 HP B&S Backfire - Lawn Mower Forums : Lawnmower Reviews, Repair, Pricing and Discussion Forum
Small Engine Repair Discussion Talk about issues or tips you may have for others regarding small engine repairs.

 
LinkBack Thread Tools
post #1 of 3 (permalink) Old 08-30-2010, 11:28 AM Thread Starter
Pat
Junior Member
 
Join Date: Aug 2010
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
17 HP B&S Backfire

Hi,

I have a Murray Wide Body with the B&S 17 HP Twin II I/C Model # 42A707. For the past 2 years this thing has been back firing when I shut it down. Before shutting it off I wait for approx 1 minute at the lowest idle with the blades disengaged. That does not help. I have checked and the choke appears to be fully open. I can tell when it is going to back fire because the engine when nothing is engaged will idle up and down on it's own.

What I have done.....I was told by an older gentleman down the road that Briggs had a carb problem with this series of engine. He told me to loosen the screws holding the float bowl to the carb, then push the bowl as far forward as possible, then tighten the screws. This seems to work every time, but I do not know why, or what the real problem is. Anyone know what might be going on with this thing...........thanks.
Pat is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old 08-30-2010, 02:30 PM
Member
 
Doorkeeper's Avatar
 
Join Date: Aug 2010
Location: Randleman N.C.
Posts: 66
Thanks: 0
Thanked 1 Time in 1 Post
If the engine is running a little rough. Adjust the valves (use owner mnual),then remove carborator and blow through ports and all openings with air (gently)replace carb on engine and see if this helps. If not then it is probably time to rebuild or replace carb.
Hope this helps!
Doorkeeper is offline  
post #3 of 3 (permalink) Old 08-31-2010, 01:12 AM
Administrator
 
Mark / Ohio's Avatar
 
Join Date: Aug 2010
Location: Central Ohio USA
Posts: 4,565
Thanks: 268
Thanked 582 Times in 496 Posts
If it's one with a fuel solenoid valve on the carb, I think those are supposed to be shutdown at mid throttle. Might double check your manual and see which method it recommends.

Mark - 2002 John Deere LT150H

Mark / Ohio is online now  
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









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



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