QuestionHi John, My engine specs are -
18.5 twin -
mod#42A707 -
type2238 E1 -
code 9708215B I wrote to you before with the same problem I have today. That is my engine runs fine as long as I run at half choke and full throttle. I originally thought pressure washing caused the symtoms.Your suggestion was as follows
Hello Ed:
"Check for a Vacuum Leak. I Wash All my Equipment with a Pressure Washer and have No Problems. If the Crankcase Vent/Breather has been Knocked Off of the Carburetor it will do as you Described. Send me the Model, Type and Code Numbers Off of the Engine, Please. With these , I can Locate a Breakdown/IPL of the Engine and Better Assist you. Hope this Helps. I am here if you Require more Assistance. Let me know what Happens, Please. Thanks.
Good Luck
Respectfully
John "--------------------------
--------------I couldn't find a vacuum leak, but maybe I wasn't looking in all the right places, so if you could be more specific with what to look for that'd help. Any info on how to test and where to test for vac leak. Furthermore, assuming that the carbureter needed cleaning, I removed the carb from the engine, sprayed it soaked it and blew it out with compressed air. Put it back on the motor and if I still have the same problem. So if your vac test instructions fail to work can you send me instructions on what rebuild kit I'd need and possibly a "how to" on rebuilding this carb. I have most tools but little experience with these procedures. Much Thanks for being there ! ED
AnswerHello Again Fred:
Thanks for the Model Numbers. Go to this Site Addy, http://www.outdoordistributors.com/ and Select the B. Then Select Briggs and Stratton. Then Select Don't have Part Numbers. Then Select the File #42. Then Select the Folder #42A700. This is the Breakdown/IPL I am Using for Reference. You can See on Page 2 of 18, the Breakdown/IPL #11 is the Crankcase Breather/Vent Tube. All the Intake Points that have Intake Gaskets #51, 51A; Both Sides of #122 has Intake Gaskets. On this Type of Engine, Low Compression on 1 Cylinder will Cause this Problem and a Miss isn't Evident. If you Have Sprayed WD40 Around the Carburetor and the Intake, and it Didn't Effect the Operation of the Engine, Then I Don't Suspect a Vacuum Leak. Is the Gas Free Flowing to the Carburetor? Even with the Pump on the Carburetor, the Gas Must Free Flow From the Tank. Check the Compression. A Blown Head Gasket May be the Cause. The Valves May Require Reseating or Adjusting. The Carburetor Breakdown/IPL is Shown on Page 6 of 18 and Page 7 of 18. If you Feel the Carburetor is Clean, I Suggest the Compression Test First. The Compression Test will Eleminate the Head Gasket and the Valves. The Carburetor Kit is Going to Depend on the Fuel Pump. Either a 3 Bolt Pump (B&S Carburetor Kit #694056) or the 4 Bolt Pump (B&S Carburetor Kit #693503). When Disassembling the Carburetor you Don't have to Remove the Welch Plugs. Soak the Carburetor Overnight in Carburetor Cleaner (I use Gunk). Then Blow Out the Passages with Compressed Air and Install New Kit. REMEMBER Carburetor are Hard to Get Clean. I have Cleaned Some Carburetor 4 or 5 Times Before they have Come Clean and Functioned Properly. This was Done Of Course After Checking the Other Components I Listed and Ending Up Back at the Carburetor Being the Only thing that Could cause the Problem. Hope this Helps. I am here if you Require more Assistance. Let me know what Happens, Please. Thanks.
Good Luck
Respectfully
John
