17 HP B&S Backfire - Lawn Mower Forums : Lawnmower Reviews, Repair, Pricing and Discussion Forum
Register Home Forum Active Topics Lawnmower Reviews Search Today's Posts Mark Forums Read

Small Engine Repair Discussion Talk about issues or tips you may have for others regarding small engine repairs.

LinkBack Thread Tools
Old 08-30-2010, 10:28 AM   post #1 of 3 (permalink)
Junior Member
Join Date: Aug 2010
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Default 17 HP B&S Backfire


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   Reply With Quote
Sponsored Links
Old 08-30-2010, 01:30 PM   post #2 of 3 (permalink)
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   Reply With Quote
Old 08-31-2010, 12:12 AM   post #3 of 3 (permalink)
Mark / Ohio's Avatar
Join Date: Aug 2010
Location: Central Ohio USA
Posts: 3,719
Thanks: 197
Thanked 479 Times in 407 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 offline   Reply With Quote
Sponsored Links

Thread Tools

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

Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 07:32 PM.

Powered by vBulletin® Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.0