How to Change the Coolant in a 1986 Suzuki RM80

Shop parts for a 1986 Suzuki RM80 Dirt Bike.

Performing a coolant change on your 1986 Suzuki RM80 is essential for keeping the engine running cool and protecting internal components from overheating and corrosion. While the process is straightforward, attention to detail ensures your RM80’s longevity and peak performance on dirt trails.

Preparation

  • Let the engine cool completely before starting, as opening the radiator cap on a hot bike can cause injury – this is especially important since the RM80’s compact engine heats up quickly.
  • Have a drain pan, fresh coolant (specifically for motorcycles), and basic hand tools ready.

Drain the Old Coolant

  • Remove any covers obstructing access to the radiator and water pump – the RM80’s design places the drain bolt on the water pump cover, typically accessible with an 8 or 10mm socket.
  • Position your drain pan under the water pump and gently loosen the drain bolt. Tilt the bike if needed to encourage full drainage.
  • Take off the radiator cap to help the coolant flow out freely. Inspect for debris inside the radiator, and clean as needed.

Flush the Cooling System

  • Optionally, pour distilled water into the radiator and allow it to drain out to flush any leftover antifreeze. Avoid tap water due to mineral content which can build up in small cooling passages.
  • Repeat until the drained water runs clear.

Refill With Fresh Coolant

  • Re-install the drain bolt securely. Fill the radiator with fresh motorcycle coolant. On the RM80, make sure the coolant covers all the fins inside the radiator without overflowing – typically filled up to just below the filler neck.
  • Replace the radiator cap.

Bleeding the Cooling System

  • Start the engine and let it run until warm to help circulate coolant and purge air bubbles. Rev gently and monitor for leaks.
  • Turn off the engine, allow it to cool, then re-check the coolant level. Top off as necessary and repeat the process if you notice a dramatic drop in level after the initial run.

Key RM80 Details

  • The 1986 RM80 features a compact, high-revving two-stroke engine designed for youth and lightweight riders, meaning the cooling system operates under demanding conditions – don’t neglect coolant changes.
  • Inspect the water pump area for any signs of gasket leakage or impeller wear, as this can commonly appear on older RM80s. Address promptly to prevent overheating.
  • RM80 radiators and caps are unique in size and fitment – using OEM or reliable aftermarket replacements ensures proper sealing and heat resistance.

Disposal & Final Steps

  • Dispose of drained coolant responsibly per local regulations.
  • Reinstall any covers removed during the process, and check for any leaks after a test ride.

Successfully changing the coolant helps your 1986 Suzuki RM80 run reliably and safely all season. For replacement gaskets, hoses, radiators, or coolant, use the proprietary MotoSport guide above for exact-fit parts tailored to your bike.

Related Shopping Categories

Shop Radiators for a 1986 Suzuki RM80 Dirt Bike.

Shop Coolant for a 1986 Suzuki RM80 Dirt Bike.

Shop Temperature Sensors for a 1986 Suzuki RM80 Dirt Bike.

Shop Tools for a 1986 Suzuki RM80 Dirt Bike.

Shop Radiator Hoses for a 1986 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.