Small Engines (Lawn Mowers, etc.): Regards John C. Bridgers, craftsman weed trimmer, briggs stratton engine

Question
I have a craftsman weed trimmer 4 cycle it has a briggs&stratton engine mod. 21032 type 0112E1 code 0504282 The runs if you done petrol live by the carburetor but to the burn turns off and pulls against explosions by the carburetor i replace the carburetor by one new but remains the same not if the fails be related to the current or the time of camshaft hope can help thank you John C. Bridgers.


Answer
Hello Frank:

You can View a Breakdown/IPL of this Engine at this Site Addy, http://www.smallenginepartswarehouse.com/parts.asp and Select the Shop Online Parts Look Up. Then Select the Model Tab. Then Select the OEM and Enter the Model (5 or 6 Digits) and Type Numbers (first 4 digits Only). Example:  21032-0112. Then Double Click on the Model in the Results Area. Select Sectional Index. Now you can Select the Section of the Engine you Wish to View. From your Description it Sounds like the Flywheel Key is Damaged (on Some Models the Flywheel Key is a Part of the Flywheel and the Complete Flywheel has to be Replaced) or the Cam has Twisted. Is the Spark Plug Gapped to .035in.? The Following is a Basic Instruction File I made for Removing the Flywheel and Replacing the Flywheel/Flywheel Key.  Remove the Cover that Houses the Starter Assembly. Remove the Spark Plug and Use a Bolt the Same Diameter and Threads as the Spark Plug and About 3" Long. Thread the Bolt into the Spark Plug Hole Until it Engages the Piston. Slowly Tighten the Bolt Until you have Locked the Piston and it Does Not Move. **BE CAREFUL A LOT OF TORQUE IS NOT REQUIRED PISTON DAMAGE CAN OCCUR IF TO MUCH TORQUE IS USED ON THE STOP BOLT** Now **Remove the Flywheel Nut. Use a 3 Jaw Puller and Attach the Puller to the Flywheel. Look for a Puller with Flat Jaws. These Slide Under the Flywheel and Allow for Easier Removal. Tighten the Puller and then Hit the Puller with a Hammer. Tighten and Hit Again Until the Flywheel is Loose and Can be Removed from the Crankshaft. Note the Key that Aligns the Flywheel to the Crankshaft. This Key is Most Likely Sheared or Bent and Causing the Plug to Fire Slightly Out of Time and Causing a Compression Lock. There is Not Enough Compression to Kick Back (and Backfire Sometimes) but Enough to Cause the Engine to Seem to Have High Compression.**  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. Have a Happy Holiday Season and May the All Mighty Bless You and Yours. Be Safe and Happy. 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