Craftsman WS210 17 in 25.4 cc 2-Cycle Gas String Trimmer MECH-WONT-START Error Fix: Trimmer Engine Will Not Start

Error code MECH-WONT-START on the Craftsman WS210 17 in 25.4 cc 2-Cycle Gas String Trimmer means: Trimmer Engine Will Not Start. The gas string trimmer engine does not start after pulling the starter rope. Craftsman gas trimmers (like the WS210 with a 25.4cc 2-cycle engine) are simple engines but are sensitive to fuel quality. Check in order: (1) FUEL — use fresh 40:1 or 50:1 gas/oil mix (check the owner manual for the specific ratio). Stale fuel is the #1 cause of 2-cycle no-start. Drain old fuel and refill with fresh mix. (2) STARTING PROCEDURE — prime the engine by pressing the primer bulb 5-7 times until fuel is visible in the bulb. Set the choke to FULL. Pull the cord until the engine attempts to fire (usually 3-5 pulls). Move the choke to HALF, pull again to start, then move to RUN. (3) FLOODED — if you smell fuel, the engine is flooded. Move choke to OFF/RUN, hold the throttle trigger fully open, and pull 10+ times to clear excess fuel. (4) SPARK PLUG — remove, inspect, and replace if fouled or worn. Check gap (typically 0.025"). (5) AIR FILTER — clean or replace if dirty. (6) FUEL FILTER — pull the fuel line from the tank. The filter is on the end inside the tank. Replace if clogged. (7) EXHAUST/SPARK ARRESTOR — the screen in the muffler clogs with carbon, restricting exhaust flow. Remove and clean with a wire brush.

The most successful fix is "Inspect and Replace Spark Plug and Clean Air Filter" (medium difficulty, ~30 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Yes — the top-ranked community fix ("Inspect and Replace Spark Plug and Clean Air Filter") is rated medium difficulty and takes about 30 minutes. Tools needed: Spark plug wrench, Feeler gauge, T20 Torx screwdriver, Clean rag.

DIY cost: $10-$20. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

The Craftsman WS210 17 in 25.4 cc 2-Cycle Gas String Trimmer has 5 other known error codes, including: MECH-DIES-THROTTLE (Engine Stalls at Full Throttle or When Cutting), MECH-LINE-FEED (Trimmer Line Will Not Advance or Feeds Continuously), MECH-OVERHEATING (Engine Overheating — Loss of Power and Potential Seizure), MECH-PULL-CORD (Pull Cord Breaks or Will Not Retract), MECH-VIBRATION (Excessive Vibration — Uncomfortable to Operate).

Error code MECH-WONT-START also appears on 9 other Craftsman models: Craftsman B210 27cc 2-Cycle Gas Leaf Blower (210 MPH), Craftsman CMXGWAS021021 3000 PSI 2.3 GPM Gas Pressure Washer, Craftsman M110 140cc 21" Push Gas Lawn Mower, Craftsman R105 30" 10.5 HP Gear-Drive Rear Engine Riding Mower, Craftsman T110 42" 17.5 HP Briggs & Stratton Single-Cylinder Riding Lawn Tractor, M270 21 in 159 cc 3-in-1 Self-Propelled Gas Push Mower, and 3 more. The fix may vary by model, so check each model's specific page for tailored repair steps.