How to Change the Oil in a 1998 Yamaha XT350 — A Complete Guide for MotoSport.com Riders
Shop parts for a 1998 Yamaha XT350 Dirt Bike.
Keeping your 1998 Yamaha XT350 running smoothly means performing regular oil changes. This comprehensive guide covers everything you need to change the oil on your XT350, including specific notes for this model year. Whether you're a seasoned pro or a weekend dirt biker, follow these steps to ensure a clean and efficient oil change every time.
Tools and Supplies Needed
- SAE 20W40 or 10W40 motorcycle oil — 1998 Yamaha XT350 specific (periodic oil change: 1.3L; with oil filter replacement: 1.4L)
- Genuine Yamaha oil filter
- Drain pan (minimum 2 liters capacity)
- Socket wrench set (8mm–12mm sockets recommended)
- Funnel (to help pour oil without making a mess)
- Clean rags or shop towels
- Torque wrench (for reinstalling drain bolt and filter cover to spec)
- Rubber gloves (recommended for cleanliness and safety)
Preparation Steps
- Start your XT350 and let it idle for 2-3 minutes. This warms the oil, thinning it so it drains faster and more completely.
Do not overheat — just a brief warm-up. - Place the motorcycle carefully on its center stand or a secure work stand to keep it upright and stable.
- Gather all your tools and supplies so you won't have to hunt for anything mid-job.
Step-by-Step Oil Change Instructions
-
Remove the Skid Plate (if equipped)
The XT350 may be fitted with a skid plate. If yours has one, remove it to access the oil drain bolt using the correct socket.
Pro tip: Lay out removed parts so reassembly is easy. -
Locate the Oil Drain Bolt
The oil drain bolt is found on the bottom of the engine case, typically on the left side of the bike.
Have your drain pan ready underneath before loosening the bolt. -
Drain the Engine Oil
Use your socket wrench to loosen (counterclockwise) and remove the oil drain bolt.
Allow old oil to drain completely into the pan — this may take several minutes.
Inspect the drain bolt for metal shavings or particles.
Note: Replace the crush washer on the drain bolt if it's worn or deformed. -
Remove and Replace the Oil Filter
The oil filter cover is located on the right side of the engine.
Use the correct socket to remove the filter cover bolts. Pull the cover straight off (some oil may spill, so have rags handy).
Remove the old filter and replace it with a new, genuine Yamaha oil filter.
Tip: Lightly oil the new filter's gasket for a better seal. -
Clean Mating Surfaces
Before installing the new oil filter and replacing the cover, clean the cover and engine surfaces with a clean rag to prevent leaks.
Ensure the O-ring is in good shape or replace it if needed. -
Reinstall the Oil Filter Cover and Drain Bolt
Reinstall the oil filter cover and torque the bolts evenly (do not overtighten.). Refer to your service manual for exact torque specs.
Clean the drain bolt, replace the crush washer, and reinstall it.
Factory torque spec for the drain bolt should be checked (usually 29 Nm is typical for this bolt). -
Refill with Fresh Oil
Remove the oil fill cap on the right side of the engine.
Use a funnel to pour 1.3 liters of new oil (after draining only; use 1.4L if also changing the filter) into the engine.
Recommended oil: SAE 20W40 or SAE 10W40 motor oil (for most climates).
Replace oil fill cap securely. -
Start and Check
Start the engine and let it idle for 2 minutes. Watch for leaks at the drain bolt and oil filter cover.
Shut off the engine. Let oil settle, then check the oil level with the dipstick or sight glass.
Add oil if needed to reach the correct level; do not overfill. -
Dispose of Old Oil Responsibly
Pour the used oil into a suitable container and take it to a proper recycling or disposal facility.
Never pour oil down drains or onto the ground. - Reinstall the Skid Plate (if equipped)
1998 Yamaha XT350 Specific Call-Outs
- Oil Capacity: 1.3L for oil change only, 1.4L when replacing the oil filter as well.
- Recommended Oil: Factory recommends SAE 20W40 Type SE motor oil, but SAE 10W40 is also commonly used and available.
Check your climate and ride conditions. For extreme cold, 10W40 may be preferable. - Drain Bolt Location: Some XT350 models may have two drain bolts (one on the engine case, another on the frame downtube). For 1998, the engine case bolt is primary.
- Double-check the Oil Filter Orientation: The XT350's oil filter installs in one correct direction (spring facing out). Verify against the old filter's position.
- Inspect O-Rings: Replace crushed or cracked O-rings/gaskets at the filter cover or drain bolt to avoid leaks.
- Routine Service Interval: Oil should be changed every 1,000–2,000 miles, or after heavy off-road use.
Always inspect oil for metal or milky color, which can indicate other problems.
Conclusion
Changing the oil on your 1998 Yamaha XT350 is a straightforward, essential maintenance task. Following the steps above keeps your engine lubricated and protected, extending its life and preserving performance on the trail. For OEM parts, filters, and performance oils, trust MotoSport.com — your source for everything XT350.
Ride safely and enjoy the trails.
Related Shopping Categories
Shop Motor Oil for a 1998 Yamaha XT350 Dirt Bike.
Shop Oil Filters for a 1998 Yamaha XT350 Dirt Bike.
Shop Oil Drain Pans for a 1998 Yamaha XT350 Dirt Bike.
Shop Tools for a 1998 Yamaha XT350 Dirt Bike.
Shop Oil Fillers and Drain Plugs for a 1998 Yamaha XT350 Dirt Bike.
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.