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About BEN
Expertise
I will answer most questions related to this field of small engine repairs,servicing them and trouble shooting problem.Can not answer questions with out the proper Engine Model#,Spec # and Manufacture.
Experience
Presently own a small engine repair shop and a Electrical contracting business.I have been in this field for 26 years.
Education/Credentials
Kohler,Briggs & Stratton,Tecumseh,MTD,Honda,and other Dealer Schools
Awards and Honors
HONORABLE DISCHARGE FROM THE UNITED STATES NAVY VIET NAM SERVICE MEDAL,GOOD CONDUCT AWARD EXPERT MARKSMANSHIP AWARD
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You are here: Experts > Home/Garden > Home Appliances > Small Engines (Lawn Mowers, etc.) > 12.5 Tecumseh OHV125
Expert: BEN
Date: 9/6/2008
Subject: 12.5 Tecumseh OHV125
Question
Tecumseh 12.5 engine Mod.# OHV125 206603A (H)Wouldn't run unless fully choked.Backfires 1 time when first starts I replaced carb bowl kit (new preset float,valve & seat,feeder tube) Free flowing fuel to carb. carb has NO adjustments.I checked flywheel pin & all conections for aie leaks &fuel cap vent.I need valve lash settings.Runs when primed then dies. I have never seen this type carb.Thank You for any help You might have. Deane
Answer
Deane
Check the exhaust outlet if it is clogged with carbon your engine will not run good.
Crankcase breather passing oil.
Possible causes:
1. Too much oil in crankcase.
2. Engine speed is excessive.
3. Oil fill cap or gasket is damaged or missing.
4. Breather mechanism is dirty or defective.
5. Piston ring gaps are aligned.
6. Piston rings are worn.
Engine backfires.
Possible causes:
1. Carburetor set too lean.
2. Magneto is not timed correctly.
3. Valves are sticking.
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