How to Change the Oil in a 1997 Cobra BM50
Shop parts for a 1997 Cobra BM50 Dirt Bike.
Changing the oil in your 1997 Cobra BM50 dirt bike is an essential part of regular maintenance. Proper oil changes help ensure a smooth-running engine and extend the lifespan of your bike. This exclusive MotoSport.com guide details the tools required, step-by-step instructions, and specific callouts owners should know for the BM50 model.
Tools and Materials Needed
- 5mm Allen wrench
- 300 cc (10 oz) of Cobra Venom 3 Shoe Clutch Milk (Part #MCMUGF32) (for best results, have up to 350 cc (12 oz) available)
- Clean rags
- Small drain pan or container (to catch old oil)
- Gloves (recommended for safety)
Before You Start
- Warm up the engine by riding the bike for between 5 – 10 minutes. This makes the oil less viscous ("runny") and helps it drain completely—but avoid letting the engine get too hot to prevent burns.
- Make sure the bike is on a level surface and securely supported.
Step-by-Step Oil Change Process
- Warm up the Engine
- Start and operate your Cobra BM50 for 5–10 minutes prior to beginning an oil change. This ensures old oil drains efficiently and completely.
Caution: Hot oil and engine parts can cause burns. Always check the temperature before proceeding.
- Start and operate your Cobra BM50 for 5–10 minutes prior to beginning an oil change. This ensures old oil drains efficiently and completely.
- Locate the Oil Drain Plug
- The drain plug is located on the right side of the engine, on the clutch cover, and near the brake lever. Look for a plug that can be removed with your 5mm Allen wrench.
Having good lighting will help you spot the drain plug location.
- The drain plug is located on the right side of the engine, on the clutch cover, and near the brake lever. Look for a plug that can be removed with your 5mm Allen wrench.
- Drain the Old Oil
- Position your drain pan underneath the drain plug.
- Using the 5mm Allen wrench, carefully loosen and remove the drain plug. Let the old oil drain completely into the pan.
Be sure to collect all old oil for proper recycling or disposal—do not dump oil onto the ground or into drains.
- Reinstall the Drain Plug
- After all oil has drained and no more drips, inspect the gasket on the drain plug and replace it if worn or damaged. Proper seal ensures no future leaks.
- Reinstall and tighten the drain plug with the 5mm Allen wrench, ensuring it is snug but not over-tightened to avoid damaging the threads or gasket.
- Refill with New Oil
- Remove the oil fill plug (check your manual if needed for location).
- Add 300 cc (10 oz) of Cobra Venom 3 Shoe Clutch Milk through the oil fill plug opening.
- Optional: You can add up to 350 cc (12 oz) for improved clutch life. Do not exceed this amount—adding more than 350 cc can degrade engine performance and is not recommended.
- Replace the Oil Fill Plug
- Inspect the oil fill plug gasket and ensure it's intact.
- Hand-tighten the oil fill plug securely.
- Final Check
- Wipe away any spilled oil with a clean rag.
- Start and run the engine for a couple minutes, then visually check for any leaks around the drain plug and oil fill plug. Shut off the engine and allow it to cool, then recheck oil level as needed.
- Dispose of Old Oil Responsibly
- Take used oil to a recycling facility or a MotoSport.com recommended service location. Never dump oil in the trash, storm drains, or on the ground.
Cobra BM50 Model-Specific Call-Outs
- Only use Cobra Venom 3 Shoe Clutch Milk oil. Cobra engineers developed this oil for the clutch/transmission environment of their auto-clutch bikes. Substituting other types of oil may reduce clutch performance and engine protection.
- Do not overfill. More than 350 cc (12 oz) in the BM50 will degrade engine performance.
- The drain plug and oil fill locations can differ from other brands and models. Always refer to your genuine Cobra owner’s manual for correct part identification and specifications.
MotoSport.com Exclusive Tips
- Warm engine—always start with a slightly warmed engine for best draining (never hot.).
- Correct oil amount—don't guess; use a graduated cylinder or measuring cup to get precisely 300–350 cc.
- Frequent oil changes—if riding in dusty or muddy conditions or during racing, change your oil more often for optimal protection and performance.
- Always inspect gaskets and seals—replace them when needed to prevent future leaks or costly engine damage.
Following this guide will keep your 1997 Cobra BM50 running smoothly. For genuine parts, oil, and expert gear, trust MotoSport.com—your authority in dirt bike maintenance.
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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.