Keep your Toro 51978 string trimmer running reliably with genuine OEM replacement parts from Repair Clinic. The 51978 is a two-cycle gas string trimmer from Toro’s residential trimmer lineup, using a two-stroke engine that requires a premixed fuel and oil ratio. Repair Clinic stocks genuine Toro OEM parts for the 51978 including the Toro string trimmer carburetor parts, Toro string trimmer air filter parts, Toro string trimmer spark plug parts, and Toro string trimmer string head parts. Browse the Toro string trimmer parts catalog filtered by 51978 for the complete parts inventory.
Toro 51978: Two-Cycle Gas String Trimmer Service
The Toro 51978 uses a two-stroke engine requiring a premixed fuel and oil ratio as specified in the owner’s manual. Carburetor varnish from ethanol-blend fuel during off-season storage is the leading cause of hard starting. Annual carburetor float bowl draining before off-season storage prevents this. The string trimmer repair help section covers Toro 51978 carburetor service, fuel filter replacement, and trimmer head line winding.
Most Replaced Parts on the Toro 51978
Carburetor for the Toro 51978
Ethanol varnish during off-season storage causes most hard-start and stall-under-load complaints. Drain the float bowl before storage and replace the fuel filter before disassembling the carburetor.
Air Filter for the 51978
Replace the air filter at the start of each trimming season. A clogged filter causes the engine to run rich and lose cutting power.
Spark Plug for the Toro 51978
Annual spark plug replacement maintains reliable starting. Always use the fuel mixture ratio specified in the Toro 51978 owner’s manual.
Trimmer Head for the 51978
The bump-feed trimmer head advances line when tapped against the ground. Replace the head when the bump knob mechanism no longer advances line reliably.
Why Choose Repair Clinic for Toro 51978 Parts
- Genuine Toro OEM Components: Carburetors, air filters, spark plugs, and trimmer heads confirmed for the Toro 51978 two-cycle gas string trimmer Toro string trimmer parts.
- Two-Stroke Fuel Mixture Guidance: The 51978 requires a premixed fuel and oil ratio. Using the wrong ratio causes premature plug fouling and engine damage.
- String Trimmer Repair Resources: Carburetor service, fuel filter replacement, and trimmer head line winding through string trimmer repair help.
- 365-Day Returns: Return any uninstalled Toro part within a full year of purchase with no restocking fees.
Toro 51978 String Trimmer Parts FAQ
What is the Toro 51978 and what type of trimmer is it?
The Toro 51978 is a two-cycle gas string trimmer from Toro’s residential trimmer lineup. The Toro 51978 uses a two-stroke engine requiring a premixed fuel and oil ratio as specified in the owner’s manual.
Why does my Toro 51978 not start after off-season storage?
Hard starting after storage is almost always caused by carburetor varnish from ethanol-blend fuel in the float bowl. Drain the float bowl before off-season storage. Replace the fuel filter and clean the carburetor before ordering a replacement.
How do I reload the trimmer head on the Toro 51978?
Press the retainer tabs on the bump knob to remove the spool. Wind new line in the direction indicated on the spool, thread the ends through the eyelets on the head housing, and snap the spool back into place.
How often should I replace the spark plug in the Toro 51978?
Replace the spark plug annually or every 50 hours of use. A plug with black carbon deposits indicates a rich fuel mixture from a clogged air filter or improperly mixed fuel.
