Briggs & Stratton 550 series engine won't idle

Reply

  #1  
Old 05-27-12, 09:23 AM
Member
Thread Starter
Join Date: May 2012
Posts: 2
Briggs & Stratton 550 series engine won't idle

I have a Bolens mower with a Briggs and Stratton 550 series (10T802-0547-B2) engine - at the end of last season the engine was running really rough so I replaced the blade, oil, spark plug, fuel, air filter, and diaphragm. I also cleaned out the carb and fuel tank.

The engine is now running a little too great - it now seems like it doesn't want to idle. If I take the governor spring off the governor hunts and sometimes stabilizes (until I attempt to move the mower), but with the spring on it just seems like the governor doesn't have the force to overcome the tension.

I will also say that prior to the beginning of this season I had never emptied the fuel tank out between seasons, and even after cleaning out the carb/fuel tank there still appears to be some sediment in the carb.

I'm at my wits end with this - I can try cleaning the carb/tank again, but I wonder where the sediment is coming from (I made sure all tubes/connecting surfaces were clean before putting it all back together). I also wonder if that is enough to cause the problem I'm experiencing.

Does anyone have any thoughts/suggestions for me?

Thanks!
 
Sponsored Links
  #2  
Old 05-27-12, 10:30 AM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,821
Did you take out the main jet and clean it?
 
  #3  
Old 05-27-12, 01:47 PM
Member
Join Date: Jun 2006
Location: St. Louis
Posts: 2,365
You need to install a new diaphram kit, it is Briggs part # 795083 or old # 495770 also Lowe's has a kit #5083 which has the same parts.
Here we go:

Remove air cleaner, there are 2 bolts that hold things together, one on the front of the tank 3/8" and one into the block 1/2", remove these bolts, now "slowly" slide the carb/tank off the intake tube and breather tube, now tilt the tank in to release the throttle linkage and waalaa the carb/tank is removed. Check the intake tube to see if the O ring seal and plastic retainer are still on the intake tube, if so remove them and re-install them into the carb. Remove the 5 screws from the carb/tank remove carb(don't loose the spring) now spray all holes, cracks and crevases in both the carb and tank surface with brake parts cleaner, remove the main screen(looks like a thimble), now with a small screwdriver pry out the main jet(carefully) and clean it, check the O ring on the main jet for damage, if it is damaged it must be replaced, reinstall the jet, it can be difficult some times to get it to snap back in place(I use the rounded end of a screwdriver handle). Remove and clean the fuel pickup stem(not necessary if the fuel tank was clean). Clean any junk/rust from the tank. Install the diaphram on the tank then the gasket(no goo or sealer) now carefully replace the carb(the spring will try to misalign the diaphram), tighten all screws a little at a time so as not to crimp the diaphram until they are all tight. Install the carb/tank in reverse order and you are done. If I missed something one of the real mechanics will correct me. Have a good one. Geo
 
  #4  
Old 05-28-12, 12:23 PM
Member
Thread Starter
Join Date: May 2012
Posts: 2
Did you take out the main jet and clean it?
No, just sprayed out the carb with cleaner. Would that cause this problem?
 
  #5  
Old 05-28-12, 01:18 PM
BFHFixit's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Jun 2007
Location: USA.
Posts: 1,836
If I missed something one of the real mechanics will correct me. Have a good one. Geo
A "real" mechanic just gave a very detailed account of how to do the repair
 
Reply

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 Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes