Engine Running Problem

Reply

  #1  
Old 06-12-02, 11:01 AM
Mark Whitcomb
Visiting Guest
Posts: n/a
Lawn mower oscillating

I have a yard man 3.75 HP lawn mower which seemed to run well last year, but oscillates (revs up then slows down) when running this summer. I tried a new spark plug and cleaning the air filter, but neither has helped. The carburetor is all plastic and doesn't have any adjustments on it.

Does anyone have any suggestions.

Mark
 
Sponsored Links
  #2  
Old 06-12-02, 09:11 PM
Sharp Advice's Avatar
Admin Emeritus
Join Date: Feb 1998
Location: The Shake and Bake State USA
Posts: 10,440
Hello: Mark

There are several possibilities that can cuase the problem you described. Most likely it's a fuel flow problem.

Check the fuel flow into the carb by disconnecting the fuel hose at the carb. Fuel should flow freely and continuously. If it does, the problem is the carb.

There is most likely some gummed up fuel ports in the carb. Cleaning and cleaning them will resolve the problem.

Suggestions:
Read the manufacturers online web site for product information, problem possibilities, causes and solving methods, part locations, disassembly, reassembly methods, repair proceedures and instructions, pictorials and schematics, which may be available online.

Read the RECENT postings and replies offered and the ARCHIVES, within this forum, for other postings and replies on this topic.

Most likely this is not all of the potential problems. The other resident small engine service and repair professionals and moderators, may offer additional suggestions, advice & help.
Check back several times for additional replies.

If you need or would like further assistance, use the REPLY button to add any additional information or ask another question, etc. Using the above method also moves the topic back up to the top of the list automatically.

Regards and Good Luck, Small Engine Forum Moderator
Tom_Bart.....TCB4U2B2B.....Company Enterprises.
Fast...Fair...Friendly & Highly Efficient Services....
"Accurate Power Equipment Company"
Small Engine Diagnostics Services and Repair.
 
  #3  
Old 06-12-02, 10:37 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,818
Sounds like you have the Briggs & Stratton 3.75 classic. There is a diaphragm between the carb and the tank. Replace it, and clean the screen on the carb pickup tube while you have it off. That should take care of your problem.
 
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