Gasoline Chain Saw Ignition Coil Replacement Fit for McCULLOCH MAC 320 / 4‑20XT / 3‑14XT / CAT 335

A saw that spins over freely, has fresh fuel and a clean plug and still refuses to fire is usually telling you the ignition coil has quit. The classic symptom is a saw that starts from cold, then cuts out once it warms up.

Which McCulloch saws it covers

Fitment is listed for the MAC 320, MAC 4-20XT and MAC 3-14XT, the MAC CAT 335, 435, 436, 440 and 441, plus the M3416N and M3414 — a longer list than the product title carries. Check the plate on your saw against that full range. This is an aftermarket replacement rather than a McCulloch-branded part, and no original equipment number is published to cross-reference.

Silicone potting over an iron core

Two materials are named: silicone and iron. The silicone matters more than it sounds. Potting compound is what seals the windings against fuel vapour, two-stroke oil mist and the fine sawdust circulating inside the housing, and it stays flexible instead of cracking as the engine heats and cools through a day's cutting. The iron core carries the magnetic field that makes the spark.

Key features

• Direct replacement: bolts in against the original coil on the listed saws.
• Sealed body: silicone moulding keeps oil mist and dust off the windings.
• Single-part fix: restores spark without splitting the engine.
• Ten listed models: covers the MAC, MAC CAT and M-series saws above.

Specifications

• Part type: chainsaw ignition coil
• Material: silicone and iron
• Fitment: McCulloch MAC 320, MAC 4-20XT, MAC 3-14XT, MAC CAT 335, 435, 436, 440, 441, M3416N, M3414 petrol saws
• Air gap, coil resistance, lead length: not published

What's in the box

• 1 x chainsaw ignition coil

Before you fit the coil

• Pull the spark plug lead and let the saw cool right down before starting work.
• These saws run on petrol. Work in a ventilated space, keep the fuel cap shut, and keep ignition sources away from spilt fuel or vapour.
• Set the coil-to-flywheel air gap to your saw's service manual figure — the supplier publishes none.
• Confirm the model stamped on your saw against the fitment list above.

Rule out the plug, the fuel and the kill switch first. If they are clear, the coil is next.

Returns, Refunds and Replacements

Products received faulty, damaged, or not as described are eligible for a return, refund, or replacement in accordance with local consumer laws. We are committed to ensuring all products meet the standards of quality and reliability expected by our customers. Please note that we do not accept returns or provide refunds for change of mind. We encourage you to carefully consider your purchase to ensure it meets your needs and expectations.