2017 Suzuki RM85 Smokes on Startup: Causes – and Fixes

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Understanding Startup Smoke on the 2017 Suzuki RM85

Seeing smoke from your 2017 Suzuki RM85 when you first fire it up can be concerning, but it isn’t always a sign of trouble. Knowing when smoke is normal and when it signals a problem helps you keep your RM85 running strong and avoid unnecessary repairs.

When Is Startup Smoke Normal?

  • Cold Starts: A brief puff of smoke is common when starting the RM85 after it’s been sitting. This is especially true in cooler weather or after the bike hasn’t run for a while.
  • Premix Oil Burn-Off: The RM85 uses a premix of oil and fuel. Some oil can settle in the crankcase or exhaust when the bike is off, leading to a small cloud of smoke on the next startup as it burns off.

In these cases, the smoke should clear up quickly as the engine warms. If the smoke persists or is excessive, it’s time to investigate further.

Common Causes of Excessive Startup Smoke

If your 2017 Suzuki RM85 smokes more than usual or the smoke doesn’t clear, consider these possible causes:

  • Incorrect Premix Ratio: Using too much oil in your fuel mix is a leading cause of heavy smoke. The RM85 requires a specific oil-to-fuel ratio. Too much oil leads to incomplete combustion and visible smoke.
  • Oil Pooling in the Crankcase or Exhaust: If the bike has been stored on its side or not run for a long period, oil can collect in the crankcase or exhaust. This pooled oil burns off at startup, causing a smoky exhaust.
  • Worn Crankshaft Seals: The crank seals keep transmission oil and crankcase oil separate from the combustion chamber. If these seals wear out, oil can leak into the combustion area, causing persistent smoke.
  • Excessive Idling or Low-Speed Riding: Prolonged idling or slow riding can cause oil to build up in the exhaust, which then burns off as smoke when the engine is revved or restarted.

Diagnosing the Source of Smoke

To pinpoint the cause, observe the following:

  • Color of Smoke: Blue or white smoke typically indicates burning oil. A brief burst is normal, but continuous smoke suggests a problem.
  • Duration: If the smoke disappears after a few seconds, it’s likely normal. If it lingers or worsens, further inspection is needed.
  • Smell: Burning oil has a distinct, sharp odor. If the smoke smells sweet or unusual, it may indicate a different issue.

Practical Fixes for a Smoking RM85

  • Check & Adjust Premix Ratio: Drain your fuel tank and refill with the correct oil-to-fuel ratio as specified for the 2017 Suzuki RM85. Use a measuring cup for accuracy.
  • Clear Excess Oil: If the bike has been stored for a while, remove the spark plug and kick the engine over several times to expel pooled oil. Clean or replace the plug if fouled.
  • Inspect Crank Seals: Persistent smoke, especially if accompanied by a drop in transmission oil level, may indicate worn crank seals. Replacing these requires splitting the engine cases, so consider your mechanical comfort level before proceeding.
  • Clean the Exhaust: Excessive oil buildup in the exhaust can be burned out by running the bike at higher RPMs for a short period. If buildup is severe, remove and clean the exhaust system.
  • Monitor Oil Consumption: Keep an eye on your transmission oil level. A steady drop can point to a seal issue.

When to Seek Further Help

If you’ve checked the basics and your 2017 Suzuki RM85 still smokes heavily on startup, it may be time for a more in-depth inspection. Persistent smoke can indicate internal engine wear or seal failure. If you’re not comfortable with engine disassembly, consult a qualified technician familiar with the RM85.

Summary

Startup smoke on the 2017 Suzuki RM85 is often normal, especially after sitting or in cold weather. However, excessive or persistent smoke usually points to issues with premix ratios, oil pooling, or crank seals. By understanding the common causes and following these practical fixes, you can keep your RM85 running clean and strong for every ride.

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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.