2013 Suzuki RM85 Smokes on Startup: Causes – and Fixes

Shop parts for a 2013 Suzuki RM85 Dirt Bike.

Understanding Startup Smoke on the 2013 Suzuki RM85

Seeing smoke from your 2013 Suzuki RM85 when you first fire it up can be concerning, but it isn’t always a sign of trouble. Knowing what’s normal and what needs attention helps keep your RM85 running strong and reliable. This guide breaks down the most common reasons for startup smoke, how to tell if it’s a problem, and practical steps to fix it.

When Is Startup Smoke Normal?

  • Cold Weather: On chilly mornings, a little white vapor is often just condensation burning off in the exhaust. This disappears as the engine warms up.
  • Initial Oil Burn-Off: After sitting for a while, some oil may settle in the engine or exhaust. A brief puff of smoke at startup is common and usually not a concern if it clears quickly.

Common Causes of Excessive Smoke on the 2013 Suzuki RM85

The 2013 Suzuki RM85 is designed for performance, but certain issues can cause it to smoke more than expected. Here’s what to look for:

  • Premix Ratio Issues: The RM85 relies on a precise fuel-to-oil premix. Too much oil in the mix leads to thick, bluish smoke at startup and while riding. Double-check your premix ratio and use a quality two-stroke oil.
  • Oil Pooling in the Crankcase or Exhaust: If the bike sits for extended periods, oil can settle in the crankcase or exhaust. This pooled oil burns off when you start the engine, causing noticeable smoke. Regularly starting and running the bike helps prevent this.
  • Worn Crank Seals: Failing crank seals can allow transmission oil to seep into the combustion chamber, resulting in persistent white or blue smoke. This is more than a startup issue and usually comes with a burnt oil smell.
  • Rich Fuel Mixture: An overly rich air-fuel mixture can cause incomplete combustion, leading to extra smoke. Check your carburetor settings and air filter for blockages.

Diagnosing the Source of Smoke

To pinpoint the cause, observe the following:

  • Color of Smoke:
    • White smoke that disappears quickly is usually condensation.
    • Blue or bluish-white smoke points to burning oil.
    • Thick, persistent smoke after warm-up suggests a mechanical issue.
  • Duration: If smoke clears after a minute or two, it’s likely normal. If it continues, further inspection is needed.
  • Smell: A strong, burnt oil odor can indicate oil is entering the combustion chamber from a bad seal or incorrect premix.

How to Fix Startup Smoke on Your RM85

Once you’ve identified the likely cause, use these practical fixes:

  • Adjust the Premix Ratio: Use the correct fuel-to-oil ratio for your 2013 Suzuki RM85. Too much oil is a common culprit for excessive smoke. Mix carefully and use a measuring cup for accuracy.
  • Run the Bike Regularly: Letting your RM85 sit for long periods can cause oil to pool. Start and run the engine every few weeks to keep fluids circulating and prevent buildup.
  • Inspect and Replace Crank Seals: If you notice ongoing smoke and a burnt oil smell, inspect the crank seals for wear or leaks. Replacing worn seals will stop oil from entering the combustion chamber.
  • Check Carburetor Settings: Ensure your carburetor isn’t running too rich. Clean or replace the air filter and adjust the fuel mixture screw as needed.
  • Clean the Exhaust: Excess oil can accumulate in the exhaust system, especially after repeated short rides. Remove and clean the silencer and expansion chamber to prevent oil burn-off smoke.

When to Seek Further Help

If you’ve tried these fixes and your 2013 Suzuki RM85 still smokes excessively on startup, it may be time for a deeper inspection. Persistent smoke can indicate internal engine wear, such as piston ring or cylinder issues, which may require professional attention.

Keep Your RM85 Running Clean

Startup smoke on the 2013 Suzuki RM85 is often normal, especially after sitting or in cold weather. However, understanding the difference between harmless vapor and signs of trouble helps you keep your bike in top shape. Regular maintenance, correct premix, and prompt attention to unusual smoke will ensure your RM85 delivers reliable performance every ride.

Related Shopping Categories

Shop Oil for a 2013 Suzuki RM85 Dirt Bike.

Shop Spark Plugs for a 2013 Suzuki RM85 Dirt Bike.

Shop Carburetor Accessories for a 2013 Suzuki RM85 Dirt Bike.

Shop Gaskets for a 2013 Suzuki RM85 Dirt Bike.

Shop Air Filters for a 2013 Suzuki RM85 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.