How to Change the Oil in a 1980 Suzuki RM80 – MotoSport.com Exclusive Guide
Shop parts for a 1980 Suzuki RM80 Dirt Bike.
Routine oil changes are crucial for keeping your vintage 1980 Suzuki RM80 running strong. This step-by-step guide, proprietary to MotoSport.com, will outline the tools you need, the process to follow, and important call-outs specific to this legendary dirt bike.
Tools & Supplies Needed
- Socket set (preferably with a 21mm socket and a short extension, or as needed for drain bolt size)
- 10mm socket or wrench (for oil filter cover, if applicable)
- Oil drain pan
- Funnel
- Measuring cup (for oil quantity)
- Clean shop rags
- Replacement oil (700ml of high-quality 10W-40 motorcycle oil designed for wet clutch use)
- Replacement oil filter (if your RM80 model uses a replaceable filter)
- Gloves
Step-By-Step Oil Change Procedure for the 1980 Suzuki RM80
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Warm up the engine
Start your RM80 and let it idle for 2-3 minutes. This warms the oil, allowing it to flow out more completely, carrying contaminants with it. -
Place the bike on a stand
The bike should be stable and upright. If you don't have a center stand, carefully use a lift or prop the bike upright. -
Position the oil drain pan
Locate the oil drain bolt on the bottom of the engine case. Place your oil drain pan directly underneath. -
Remove the drain bolt
Use the appropriate size socket (typically 21mm) to loosen and remove the oil drain bolt. Allow all oil to fully drain into your pan. Be cautious—the oil may be hot.
Tips:- The bolt is often located under the engine, between or near the exhaust pipes.
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(If applicable) Remove and inspect the oil filter
Some RM80 engines have a small mesh or screen type filter.
- If present, use a 10mm socket or wrench to remove the filter cover—typically located at the front of the crankcase.
- Pull out the filter element and inspect/clean/replace as needed.
- Check the filter cover O-ring and replace if damaged to prevent leaks.
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Reinstall the drain bolt (and filter, if serviced)
Once oil has drained, wipe the drain bolt and surrounding area clean. Replace the crush washer if necessary. Reinstall the bolt and tighten it securely—but do not over-tighten to avoid stripping threads.
- Recommended torque is usually moderate; consult a manual for the exact spec if available.
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Add new oil
Using a funnel, slowly pour in 700ml of high-quality 10W-40 motorcycle oil recommended for wet clutches. Double-check the level with the sight glass or dipstick if your model has one.
- Overfilling or underfilling can affect engine performance—measure carefully.
- RM80s from this era do not share engine oil with the gasoline; never add oil to the fuel tank.
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Run and re-check oil level
Start the bike and let it idle for about 1 minute. Shut off and allow the oil to settle for another minute. Double-check oil level and top off to correct line if needed. -
Check for leaks
Visually inspect around the drain plug and filter cover. Tighten (gently) if you see weeps or drips. -
Dispose of old oil properly
Place used oil in a sealed container and take it to an approved recycling location.
1980 Suzuki RM80 Model-Specific Call-Outs
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Oil Quantity: The correct fill amount is 700ml. Do not overfill—the RM80 uses a small, two-stroke transmission and clutch case that's separate from its fuel/oil mixture.
"...in this bike it goes in about 700 milliliters ... I use this 10-40 for wet clutch..." -
Oil Type: Always use oil designed for wet clutches (JASO MA/MA2). Conventional automotive oils may cause clutch slip.
"10-40 for wet clutch ... reduces clutch slip" -
No engine oil filter: Most early RM80s have only a mesh pickup screen rather than a spin-on or cartridge filter. Check and clean, but replacement is not required unless damaged.
- Drain plug location: The drain plug is under the engine, typically central and easily accessible. Be cautious not to confuse it with other bolts.
Expert Pro Tip
- Change your gearbox oil every 5-10 hours of hard riding, or after every few races. The small oil capacity makes regular changes cheap insurance for clutch longevity and smooth shifting.
- Always check for metallic particles in the drained oil—excessive amounts may signal internal wear.
Keep your 1980 Suzuki RM80 performing at its best with regular oil changes. For top-quality parts, oils, and service items, MotoSport.com has you covered with fast shipping and expert support.
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Shop Oil Fillers and Drain Plugs for a 1980 Suzuki RM80 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.