How to Change the Coolant in a 1995 KTM 300MXC: Complete MotoSport Guide

Shop parts for a 1995 KTM 300MXC Dirt Bike.

Changing the coolant in your 1995 KTM 300MXC is a vital maintenance task that keeps your two-stroke running cool on the toughest trails. This guide from MotoSport covers every step, highlights what makes the 1995 300MXC unique, and ensures you get the best performance & longevity from your dirt bike.

What Makes the 1995 KTM 300MXC Unique?

The 1995 KTM 300MXC stands out for its legendary two-stroke power, durable liquid cooling, and off-road prowess. Owners should note:

  • Simple radiator design: The 300MXC features a robust, easy-to-access dual radiator system ideal for maintenance and cleaning.
  • No overflow bottle: Like many older KTMs, this bike relies on a direct cap and hose setup, making coolant changes quick but requiring precise filling and burping to eliminate air pockets.
  • Original coolant spec: KTM recommends using high-quality ethylene glycol-based coolant. For modern protection, always opt for dirt bike-specific, silicate-free coolants formulated to prevent scale and corrosion.

Tools & Materials You'll Need

  • Flathead screwdriver or socket set
  • Drain pan
  • Funnel
  • Distilled water (for flushing)
  • Suitable coolant (see above note)
  • Latex gloves & safety glasses

Step-by-Step 1995 KTM 300MXC Coolant Change

  1. Prep the Bike
    Make sure the engine is completely cool. Set the bike on a stand or level surface for best access.
  2. Remove the Radiator Cap
    Carefully twist off the radiator cap. If the system is not cool, DO NOT remove – pressurized hot coolant can cause burns.
  3. Drain the Old Coolant
    Locate the coolant drain bolt on the water pump (left side of the engine case). Place the pan below, then remove the bolt & let coolant drain entirely.
    To promote full drainage, gently loosen the lower radiator hose clamp and disconnect the hose at the radiator base.
  4. Flush the System (Recommended)
    Reinstall the drain bolt and hose. Fill the radiator with distilled water using a funnel. Replace the cap, start the engine, and let it run for a minute (do not allow it to overheat). Shut off, cool down, then re-drain.
    Repeat until water runs clear–typically 2 times if old coolant was dirty or faded*.
    *Flushing is especially important if changing coolant types or after engine work.
  5. Add New Coolant
    With the bike cool, reinstall the drain bolt (torque to spec) and reconnect all hoses. Fill the radiator slowly until coolant just reaches the neck. Tap the hoses and gently rock the bike to burp trapped air.
  6. Bleed & Pressurize
    Start the engine and let it idle with the cap off for 30–60 seconds, adding more coolant if the level drops. When no more air bubbles emerge, top up and install the radiator cap firmly.
  7. Check for Leaks
    Inspect drain bolt, hoses, and radiator seams. Wipe with a paper towel and make sure everything is dry.
  8. Ride & Recheck
    Let the bike fully cool after a short ride, then open the cap (if needed) and recheck the level. Top up to the neck if needed.

Key Model-Specific Tips for the 300MXC

  • When bleeding, gently tilt the bike to the left and right to release air from the tall radiators
  • Use only distilled water for flushing to avoid mineral deposits
  • If your radiator fins are bent or clogged, gently clean them before reinstallation–avoid pressure washing
  • KTM's robust water pump usually seals well, but if your bike leaks from the weep hole, consider replacing the shaft seal for optimal cooling

Keep Your 1995 KTM 300MXC Cool on the Trail

Proper coolant maintenance prevents overheating and costly repairs–and keeps your 300MXC's legendary two-stroke engine performing at its best. For all your coolant, radiator, and KTM 300MXC maintenance parts, visit MotoSport for model-specific solutions and expert support.

Related Shopping Categories

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Shop Radiator Hoses for a 1995 KTM 300MXC 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.