How to Change the Oil in a 2002 Husqvarna CR50

Shop parts for a 2002 Husqvarna CR50 Dirt Bike.

Maintaining fresh oil in your 2002 Husqvarna CR50 is crucial to the performance and longevity of the bike's transmission and clutch systems. While the CR50 runs a two-stroke engine (which requires pre-mixed fuel for top-end lubrication), the transmission still uses separate oil that must be changed regularly. Below you'll find a step-by-step oil change guide specific to the 2002 Husqvarna CR50.

Tools and Supplies Needed

  • Socket wrench set (with correct size for oil drain plug)
  • Catch/drip pan
  • Funnel
  • Syringe or measuring cup (to refill with precise oil volume)
  • Cleaning rags or paper towels
  • Fresh transmission oil (see your manual for oil type and quantity)
  • Optional: Nitrile gloves, new crush washer for drain plug

Preparation

  • Run the engine for a few minutes to warm up the oil. This allows the old oil to drain more thoroughly and carries away more contaminants.
  • Park the bike on level ground, using a bike stand to keep it upright and stable.

Step-by-Step Guide

  • Remove the oil filler cap.
    This is typically located at the top or side of the right crankcase. Removing the cap allows air in and ensures the oil drains smoothly.
  • Position a drip pan beneath the engine.
    Make sure your pan will catch all draining oil to avoid a mess.
  • Remove the oil drain plug.
    Locate the oil drain plug at the bottom of the right engine case. Use the correct socket size and be careful, as the oil may be hot.
  • Allow all the oil to drain out completely.
    Be patient and let gravity do its job. This ensures you flush out as much old oil and sludge as possible.
  • Inspect the drain plug and crush washer.
    Wipe off the drain plug and check the washer for damage. Replace the washer if necessary to prevent future leaks.
  • Reinstall the drain plug.
    Tighten the drain plug securely, but do not over-torque as this can strip threads or crack the case.
  • Refill with fresh transmission oil.
    Use a syringe or measuring cup to pour the recommended amount and type of oil through the oil filler hole. For the Husqvarna CR50, always consult your owner's manual for the exact oil volume and viscosity.
  • Replace the oil filler cap.
    Tighten the cap securely to avoid leaks.
  • Check for leaks.
    Wipe up any spills, start the engine, let it idle for a minute, and inspect for oil leaks around the drain plug and filler cap.
  • Check oil level.
    With the bike upright on level ground, remove the oil check screw (if equipped) and confirm oil is at the correct level. Add oil if needed.

Specific Call-Outs for the 2002 Husqvarna CR50

  • The CR50 is a two-stroke engine, so engine lubrication is handled by premix fuel–not separate engine oil. You are changing only the transmission/clutch oil; do not attempt to drain oil from the “engine” as with four-stroke bikes.
  • Oil capacity may vary by model year and region. Always reference your specific owner's manual for capacity and grade, but a common spec is about 250ml of 10W-40 or transmission-specific oil. If unsure, err on the side of filling until oil just skims the lower edge of the oil check screw port when the bike is upright on level ground.
  • Use only quality, motorcycle-specific transmission oil. Automotive oils may lack the properties to protect clutch components.
  • Dispose of old oil properly at an approved recycling center. Never pour it on the ground or in household garbage.

Pro Tips from MotoSport.com

  • Change the transmission oil often—every 5–10 hours of riding or after any race event, as clutch wear contaminates oil quickly in small 2-strokes.
  • Keep a maintenance log. Note oil changes, filter cleanings, and any parts replaced to ensure long-term reliability and maximum resale value.
  • If you ride in wet or muddy conditions, inspect and change oil more frequently, as water and debris can quickly compromise lubricating properties.
  • If you're unsure about oil capacity, add small amounts gradually and check level frequently using the level check screw—overfilling can cause leaks or clutch drag.

This comprehensive oil change guide is proprietary to MotoSport.com and tailored for the 2002 Husqvarna CR50. Proper care and timely oil changes will keep your mini motocross bike running strong and ready for the track.

Related Shopping Categories

Shop Motor Oil for a 2002 Husqvarna CR50 Dirt Bike.

Shop Oil Filters for a 2002 Husqvarna CR50 Dirt Bike.

Shop Oil Drain Pans for a 2002 Husqvarna CR50 Dirt Bike.

Shop Tools for a 2002 Husqvarna CR50 Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2002 Husqvarna CR50 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.