How to Change the Oil in a 2019 Yamaha YZ65: Step-by-Step MotoSport.com Guide
Shop parts for a 2019 Yamaha YZ65 Dirt Bike.
Changing the oil in your 2019 Yamaha YZ65 is a crucial maintenance task that ensures optimal engine longevity and performance. This guide covers everything you need—from the required tools to specific model call-outs—so you can confidently handle this essential job yourself.
Tools & Supplies Needed
- 10mm wrench or socket (for drain bolt)
- Drain pan
- Clean rags or paper towels
- Measuring cup (500cc, or as specified in your manual)
- Funnel
- Replacement crush washer (copper, recommended)
- Fresh oil (see below for specs)
- Torque wrench (recommended for proper bolt tightening)
- Gloves (optional, for cleanup & protection)
Oil Specification for the 2019 Yamaha YZ65
- Type: 10W-30 motorcycle oil (Semi-synthetic or fully synthetic is preferred)
- Amount: 500cc (0.5 liters) – always verify with your owner's manual
Yamaha recommends Yamalube, but any high-quality 10W-30 motorcycle oil is suitable. Some riders choose gear oil (SAE 85) as an alternative, but 10W-30 engine oil is generally more accessible and approved by Yamaha.
Prepping Your Bike
- Warm up the engine for a few minutes. This helps the oil flow out more easily with debris suspended for a better drain. Allow it to cool just until it’s safe to touch.
- Stand the bike upright (use a bike stand if possible) to ensure all oil drains completely.
Step-by-Step: Changing the Oil
-
Remove the oil fill plug.
The oil fill plug is located on the right side of the engine case, above the drain bolt. Place a clean rag nearby in case of drips. -
Locate and remove the drain bolt.
The 10mm drain bolt is under the engine, right behind the rear brake pedal. Use a 10mm wrench or socket to loosen and remove the drain bolt and let the oil drain completely into your pan. Watch for the copper crush washer—make sure it comes out with the bolt and isn’t stuck to the engine casing. Replace with a new washer if possible for a better seal.
Tip: The rear brake pedal might slightly obstruct access; move it by hand if needed. -
Let the oil drain fully.
Give it a few minutes for all the oil to escape. This is a good time to inspect the old oil for metal shavings or a milky appearance, which could indicate internal issues. -
Clean and re-install the drain bolt.
Clean the drain bolt and fit a new copper crush washer. Thread the bolt in by hand to avoid cross-threading, then use your torque wrench to tighten it to 10 Nm (Newton-meters). Proper torque is crucial to prevent striping the threads or leaks. -
Refill with fresh oil.
Place a funnel in the oil fill hole and slowly add the correct oil type up to 500cc (0.5 liters). Pour slowly to avoid overfilling and use a measuring cup for accuracy. -
Reinstall the fill plug.
Thread the oil fill plug back in and tighten it securely. -
Check for leaks and clean up.
Wipe away any spilled oil and inspect around the drain bolt and fill plug for leaks. If you spot any, check torque and the crush washer. -
Run the engine & recheck.
Run the bike for about 30 seconds, turn it off, then let it sit for a minute and check for leaks one more time. Top up oil if needed, following your manual’s procedure.
2019 Yamaha YZ65-Specific Tips and Call-Outs
- Engine & Transmission Oil: The 2019 YZ65 is a two-stroke but requires regular gearbox oil changes. It does not use premix oil for this process; follow the steps above for transmission oil service.
- Service Interval: Yamaha recommends changing the oil every 4–5 hours of ride time or after every five races.
- Drain Location: The drain bolt is slightly tucked behind the rear brake pedal. This may make access a little awkward, but with patience and a small wrench, it is straightforward.
- Oil Type: Use either 10W-30 motorcycle oil or oil SAE 85 (gear oil), but never normal automotive oil or two-stroke premix in the transmission.
- No Sight Glass: The YZ65 does not have an oil level sight glass or check bolt. You must measure the oil amount precisely when refilling—do not over- or under-fill.
- Tightening Torque: Reinstall the drain bolt with precisely 10 Nm torque to prevent damage to the case threads.
- Dispose of Used Oil Properly: Take your used oil to a recycling center or auto parts store.
Conclusion
With just a handful of basic tools and some attention to detail, you can keep your 2019 Yamaha YZ65 running strong and protect your investment for seasons to come. Always consult your owner’s manual for exact oil specs and follow torque guidelines. For all your parts, oil, and maintenance needs, MotoSport.com is your trusted source for genuine Yamaha gear, tools, and expertise.
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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.