Question

Ninja 650 won’t start on first crank when the engine is cold. Starts right up second time as well as any time after the engine has warmed up. Any suggestions?

Answer 1

If your Ninja 650 motorcycle is experiencing difficulty starting on the first crank when the engine is cold, but starts fine on the second attempt or after the engine has warmed up, there could be a few possible causes. Here are some suggestions to consider:

1. Fuel-related issue: Cold starts can sometimes be affected by fuel delivery problems. Check if the fuel pump is functioning properly and delivering an adequate amount of fuel to the engine. It's also worth inspecting the fuel lines for any blockages or leaks that could be affecting fuel flow.

2. Spark plugs: Worn or fouled spark plugs can cause starting issues, particularly when the engine is cold. Inspect the spark plugs to ensure they are in good condition, with the correct gap and properly tightened. If they are old or worn, consider replacing them.

3. Battery condition: A weak or aging battery may struggle to provide enough power for a cold start. Check the battery voltage and ensure it is within the recommended range. If the battery is old or showing signs of weakness, it might be worth considering replacing it.

4. Cold start enrichment system: Some motorcycles, including the Ninja 650, have a cold start enrichment system (choke). Make sure the choke is properly engaged when starting a cold engine. If the choke is not functioning correctly, it could cause starting issues.

5. Throttle position sensor (TPS): A faulty or misaligned TPS can affect cold starts. Ensure the TPS is calibrated correctly and providing accurate throttle position information to the engine management system.

6. Air intake and filter: Check the air intake system and air filter for any obstructions or dirt accumulation. A clogged air filter can impede proper air flow, affecting starting performance.

If the issue persists after checking these common causes, it might be helpful to consult a professional motorcycle mechanic or Kawasaki dealership for a more in-depth diagnosis and potential resolution. They will have the expertise and tools to identify any specific issues with your Ninja 650 and recommend appropriate solutions.