1. Initial Inspection:
* Visual: Look for any signs of rust, corrosion, or damage on the frame, engine, bodywork, and components.
* Fuel: Check the condition of the fuel in the tank. If it's old, drain it completely.
* Oil: Check the oil level. If it's been sitting for a long time, it's best to change it even if it seems full.
2. Essential Maintenance:
* Battery: Charge or replace the battery. A dead battery can be a major hassle.
* Engine Oil and Filter: Change the engine oil and oil filter. Use fresh, high-quality oil appropriate for your motorcycle.
* Air Filter: Clean or replace the air filter. A dirty air filter restricts airflow and can cause engine problems.
* Spark Plug: Inspect and clean or replace the spark plug. A fouled spark plug can prevent the engine from starting.
* Tires: Check tire pressure and inspect for cracks or damage. Ensure the tires are inflated to the correct pressure.
* Chain and Sprockets: Clean and lubricate the chain. Inspect the sprockets for wear.
* Brakes: Check brake pads and rotors for wear. Bleed the brake system if needed.
3. Engine Related:
* Carburetor: Clean or rebuild the carburetor. This is crucial for proper fuel flow and starting.
* Fuel System: Inspect fuel lines, hoses, and filters for cracks or leaks.
* Cooling System: Check coolant level and condition. Flush and refill if necessary.
4. Other Important Items:
* Fork Seals: Check for leaks. If necessary, replace the fork seals.
* Suspension: Check for leaks and inspect for signs of wear or damage.
* Steering Head Bearings: Check for play in the steering head bearings.
* Lights and Signals: Ensure all lights and signals are working correctly.
5. Starting and Running:
* Start the Engine: Once you've completed the above steps, try starting the engine. If it doesn't start easily, you may need to investigate further.
* Warm-Up: Let the engine warm up for a few minutes.
* Test Ride: Once the engine is warm, take the bike for a short test ride. Pay attention to how the bike handles and any unusual noises.
Additional Tips:
* Use a Service Manual: Consult a Yamaha WR426 service manual for detailed instructions and specifications.
* Safety First: Always wear appropriate safety gear when working on your motorcycle.
* Professional Help: If you're not comfortable performing some of these tasks, consider taking the bike to a qualified mechanic for professional service.
Remember: This checklist is a good starting point. The specific maintenance needed for your WR426 may vary depending on its condition and the length of time it has been sitting. A thorough inspection is always recommended before riding.
