Question
carburetor
QUESTION: I have a Craftsman 19.5 tractor with a Briggs engine model number 42e707 type number 2631-e3, according to the manual anyway. It started to run very badly like it was being starved for gas, but ran pretty good if I run it with the choke on. This model has a fuel pump, according to the picture I sent. I checked it and it seems to run by a diaphragm with a hose running to the engine for vacuum. I was going to adjust the carburetor according to instructions, but there is no idle mixture screw like it says in the booklet. I'm at a loss. I changed the fuel filter, still the same problem. The missing idle mixture screw baffles me. Any ideas as to why it could be running so bad. I did change the plugs, but I think it might be in the carb. Thanks.
ANSWER: Hello Robert:
From your Description it Sounds like the Idle Air Mixture Screw is Missing and Requires Replacing. You can View a Breakdown/IPL of the Engine at this Site Addy; http://www.briggsandstratton.com/maint_repair/manual_and_more/doclist.aspx?categ and Enter the Model Numbers (42e707) and the First 4 Type Numbers (2631) in the Appropriate Boxes and Click GO. Then Select Download PDF. The Idle Air Mixture Screw is #94 in the Breakdown and is Briggs and Stratton Part #491538. The Missing Idle Air Screw and Spring will Cause the Engine to Run Poorly. If you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Thanks.
Good Luck
Respectfully
John
PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Comments and Ratings are Greatly Appreciated. Thanks.
Respectfully
John
---------- FOLLOW-UP ----------
carburator
QUESTION: John, I could not find that last message you sent me about maybe misunderstanding the question I went to the website and downloaded the pdf file for my engine type, but you said something about sending you the manual parts list. I'm sorry, I just could not find that last answer. Anyway, I am sending a couple more pictures and hopefully you can find out about the missing needle valve. I remember you saying that the needle air/gas adjuster should be on the side, but the only one there is the idle stop plate. Look at the pictures and hopefully we can get this together. Many thanks. Rough when you are only allowed 10 questions per day. Should be new questions, not repeats.
Bob
AnswerHi Again Robert:
The Following is the Correspondence that we have had that was in my Files at All Experts:
You answered this question on 10/23/08
Questioner: Robert
Category: Small Engines (Lawn Mowers, etc.)
Private: No
Subject: Briggs & Stratton carburetor
Question: QUESTION: I have a Craftsman 19.5 tractor with a Briggs engine model number 42e707 type number 2631-e3, according to the manual anyway. It started to run very badly like it was being starved for gas, but ran pretty good if I run it with the choke on. This model has a fuel pump, according to the picture I sent. I checked it and it seems to run by a diaphragm with a hose running to the engine for vacuum. I was going to adjust the carburetor according to instructions, but there is no idle mixture screw like it says in the booklet. I'm at a loss. I changed the fuel filter, still the same problem. The missing idle mixture screw baffles me. Any ideas as to why it could be running so bad. I did change the plugs, but I think it might be in the carb. Thanks.
image: Small-Engines-Lawn-1746/2008/10/carburetor.jpg
ANSWER: Hello Robert:
From your Description it Sounds like the Idle Air Mixture Screw is Missing and Requires Replacing. You can View a Breakdown/IPL of the Engine at this Site Addy; http://www.briggsandstratton.com/maint_repair/manual_and_more/doclist.aspx?categ and Enter the Model Numbers (42e707) and the First 4 Type Numbers (2631) in the Appropriate Boxes and Click GO. Then Select Download PDF. The Idle Air Mixture Screw is #94 in the Breakdown and is Briggs and Stratton Part #491538. The Missing Idle Air Screw and Spring will Cause the Engine to Run Poorly. If you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Thanks.
Good Luck
Respectfully
John
PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Comments and Ratings are Greatly Appreciated. Thanks.
Respectfully
John
---------- FOLLOW-UP ----------
QUESTION: Thanks for the quick response. The picture I sent you, does the mixture screw go into the bottom of the 2 holes that are shown? How in the world could it have fallen out if it is spring loaded? I thought maybe this carburetor did not have one. While looking at the bottom small hole, I did notice a circular indentation there but it looks like there are no threads in the hole. Would I be able to just order the needle valve or do I have to order the whole rebuild kit, which I hope not. Thanks again.
Answer: Hello Again Robert:
Send me the Carburetor Numbers, Please. With these I can Locate the Proper Manual and Better Assist you. Some of these Style Carburetors have 2 Holes at the Bottom as Seen in your Picture that are Support Bracket Mount Holes. Some of these Carburetor have No Idle Air or High RPM Air Mixture Screws. If this is the Case with this Carburetor, then a Good Soaking is Required. Usually the Idle Air Screw is Located on the Side Near the Top of the Carburetor. I May have Misunderstood the Original Question. Thanks.
Respectfully
John
PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Thanks.
Respectfully
John
10/23/08 11:00pm : Now there is 1 Thing I need to Add. If the Engine Still has the Old Spring Style Hose Clamps for the Fuel Lines (Pump Included), then Change them to the Screw Style Hose Clamps. This will Eliminate the Loss of Vacuum to the Fuel Pump as the Cause of this Problem. If you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Thanks.
Good Luck
Respectfully
John
PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Comments and Ratings are Greatly Appreciated. Thanks.
Respectfully
John
