MOTO1988 Ignition Coil & CDI Kit for Yamaha Timberwolf/Bear Tracker 250 — 1994-2000 OEM Fit, Includes Spark Plug

MOTO1988's Igniter CDI box, ignition coil and spark plug kit replaces the factory 4BD-85540-10-00 assembly for Yamaha Timberwolf 250 and Bear Tracker 250 models, restoring reliable spark and consistent starting performance.

This complete ignition kit from MOTO1988 is designed as a direct-fit replacement for worn or damaged ignition components on a range of Yamaha 250 ATVs from the mid‑1990s through 2000. The set contains an ignition coil, a CDI (Capacitor Discharge Ignition) unit and a spark plug, packaged to match OEM specs so you can swap parts quickly. Before ordering, compare the photos and the OEM number 4BD-85540-10-00 against your original parts to confirm fitment. Installation requires basic mechanical skills and electrical safety precautions such as disconnecting the battery and keeping wiring clear of heat sources.

How will this kit affect my ATV's starting and running?

Replacing worn ignition components typically improves spark strength, leading to quicker starts and steadier idling. A correctly matched CDI and coil pair helps maintain consistent timing and combustion under varying loads.

• Restores proper spark energy for reliable ignition.
• Reduces misfires and hard-start symptoms caused by aged components.
• Improves throttle response and low-end running stability.

Which Yamaha models and years are compatible with this part?

This MOTO1988 kit was built to fit Yamaha Timberwolf and Bear Tracker 250 models across the years listed and corresponds to OEM part number 4BD-85540-10-00. Always cross-check the picture and OEM number against your unit before purchase.

• Yamaha Timberwolf 250 YFB250: 1994–1998 (including FW 4x4 variants through 2000).
• Yamaha Timberwolf 250 YFB250FW 4x4: 1994–2000.
• Yamaha Bear Tracker 250 YFM250B/YFM250X: 1999–2000.

What comes in the box and what should I prepare for installation?

The kit ships with the core ignition parts you need to replace the system component set, but you’ll want basic tools and safety steps ready. Disconnect the battery before beginning and keep exposed wiring away from hot parts and moving components.

• Included: 1 ignition coil, 1 spark plug, 1 CDI unit (OEM 4BD-85540-10-00 reference).
• Recommended tools: basic hand tools, torque wrench for plug, and a multimeter for post-install testing.
• Safety: unplug battery, avoid routing wires near exhaust, verify connections are secure.

How do I know if the CDI or coil is the issue, and can I test them after fitting?

Common signs of ignition component failure include intermittent spark, poor idling, and difficulty starting. After installing the kit, simple electrical tests or a visual spark test can confirm proper operation.

• Symptoms: weak/no spark, running rough, or stalling under load.
• Quick checks: verify spark at the plug with a proper insulated tester or use a multimeter to check coil resistance per service specs.
• Post-install: start the ATV and check for steady idle and consistent throttle response.

Who is this for: This MOTO1988 igniter CDI box, ignition coil and spark plug set is intended for owners, mechanics and restorers of Yamaha Timberwolf 250 and Bear Tracker 250 ATVs who need a direct-fit OEM-referenced replacement. It’s suitable for DIY enthusiasts with basic electrical and mechanical knowledge as well as professional shops seeking a compact replacement kit to resolve ignition-related starting and running issues. If you’re unsure about compatibility, compare your current part to the provided pictures and the OEM number 4BD-85540-10-00 before ordering.