top of page

Hard Starting? Bad Gas?

Updated: Jun 11

Identifying bad gas in a two-stroke outboard can be crucial for maintaining performance and preventing damage. Here are some signs that you might have bad gas in your engine:

1. Hard Starting: Difficulty starting the engine or needing multiple attempts to get it running can indicate bad gas.

2. Rough Idling: If the engine runs unevenly or stumbles at idle, this could be a sign of fuel issues.

3. Reduced Power: A noticeable drop in performance, such as lower speed or power output, might suggest the fuel is no longer providing optimal combustion.

4. Engine Misfires: Irregular or inconsistent firing of the engine, often accompanied by unusual noises, can be caused by degraded fuel.

5. Poor Acceleration: If the engine hesitates, sputters, or fails to respond smoothly when you accelerate, bad gas could be the culprit.

6. Increased Smoke: Excessive smoke from the exhaust can indicate improper combustion, often due to bad or old fuel.

7. Fuel Odor: Bad gas often has a sour or varnish-like smell, different from the normal gasoline odor.

8. Clogged Carburetor/Fuel Injectors: Residues and varnish from old gas can clog the carburetor or fuel injectors, leading to poor engine performance.

To confirm if bad gas is the issue, you can:

  • Inspect the Fuel: Check the fuel for discoloration or debris. Good gasoline should be clear and free from particles.

  • Smell the Fuel: Fresh gasoline has a specific, sharp odor. If the gas smells sour or like varnish, it’s likely gone bad.

  • - Test with Fresh Fuel: If you suspect bad gas, drain the fuel tank and replace it with fresh gasoline. If the engine runs better with the new fuel, it confirms the old gas was problematic.

Regular maintenance and using fresh, high-quality fuel can help prevent these issues and keep your two-stroke racing outboard performing at its best.

17 views0 comments

Recent Posts

See All


Rated 0 out of 5 stars.
No ratings yet

Add a rating
bottom of page