How to Change the Coolant in a 1986 Yamaha XT350
Shop parts for a 1986 Yamaha XT350 Dirt Bike.Regular coolant changes are essential to keep your 1986 Yamaha XT350's engine running cool and reliable, especially since this model is revered for its balance of off-road capability and on-road manners. Here's a step-by-step guide tailor-made for your XT350, so you can service your cooling system with confidence and precision.
What Sets the XT350 Apart
- The XT350 is air-cooled with an oil cooler assembly but does not have a traditional radiator. Owners sometimes refer to refreshing the engine oil and cleaning the oil cooler as part of "coolant" maintenance, since the oil acts as the cooling medium.
- A true coolant flushlike you'd perform on a liquid-cooled motorcycledoes not apply to this bike. However, keeping the oil circuit clean and using the correct grade of oil is absolutely vital, as the XT350 relies on oil circulation to dissipate engine heat.
Step-by-Step: Changing the Engine Oil (XT350 "Coolant")
- Warm up your engine for a few minutes to thin the oil, allowing it to drain more completely. Be careful—hot oil can burn.
- Place your dirt bike on a stable stand on level ground. Remove the skid plate if equipped, for easier access.
- Locate the oil drain bolt (typically on the underside of the engine). Use a 17mm or 19mm wrench (verify on your specific bike).
- Place a suitable drain pan under the bolt. Remove the drain bolt and allow all oil to drain completely.
- Replace the drain bolt with a fresh washer to ensure a tight seal.
- Remove the oil filter cover and swap in a new filter. Clean the cover and spring if dirty. Replace the filter cover O-ring if cracked.
- Refill with manufacturer-recommended oil – typically a 10W-40 motorcycle-specific oil for this model. Fill through the filler cap on the engine’s right side. Use the sight glass or dipstick to check the fill level.
- Start the engine and let it idle for a minute, then stop and re-check oil level. Top up if necessary and check for leaks near the plugs or filter cover.
Extra Steps for Thorough Maintenance
- If your XT350 has been used in muddy or dusty conditions, consider flushing the oil circuit with fresh oil (run briefly, then drain and refill with new oil again).
- Clean the oil cooler fins with a soft brush and inspect for dirt or debris.
- Inspect all oil lines for cracks or leaks, which are vital for proper cooling.
Special Notes for XT350 Owners
- Never use automotive oils with friction modifiers; always use motorcycle-specific oil to avoid clutch issues and achieve optimal cooling.
- The XT350's simplicity is its strength. There's no radiator or water pump, so regular oil and filter changes are the key maintenance step for reliable engine cooling.
- If you notice excessive engine heat, check the oil cooler for airflow obstructions and confirm you are using the correct oil weight for your climate.
Responsible Disposal
- Always dispose of old engine oil and filters at an approved recycling center. Never dump oil in the trash or on the ground.
By following these steps, you'll keep your 1986 Yamaha XT350 running cool and strong for years to come, enjoying everything that made this legendary dual-sport a classic. For any replacement parts or upgraded components, MotoSport has your 1986 XT350 covered with everything you need for long-term reliability.
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Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.