Mercury 9.9 Pro Kicker Problems – 5 Problems 

Do you own a Mercury 9.9 pro kicker and recently facing issues with your 9.9 Pro Kicker? It’s common and I’ve already heard many people looking for it. 

In this article, I will explain Mercury 9.9 pro kicker problems. By identifying the symptoms, and reasons, and providing solutions, I aim to help boaters get back on the water with confidence.

Mercury 9.9 Pro Kicker Problems: Quick Guide

Let’s start with a quick overview of the 9.9 pro kicker issue.

Starting DifficultyCheck the fuel filter for debris and clean or replace it.
OverheatingClear any obstructions in the water intake.
Poor Performance at High SpeedsEvaluate propeller size and pitch for suitability.
Mercury 9.9 Pro Kicker Will Not IdleClean the carburetor thoroughly.
Mercury 9.9 2 Stroke Won’t Stay RunningCheck and clean or replace the fuel filter.

Next, I’ll discuss the problem in proper detail. But before that, I would like to suggest another article I wrote on – 8.2 Mercruiser problem

Mercury 9.9 Pro Kicker Problems – Detailed Guide

Problem 1: Starting Difficulty

Starting difficulty is a frustrating issue that can occur with the Mercury 9.9 Pro Kicker. It may prevent you from enjoying your boating experience and cause unnecessary delays.


  1. The engine fails to start, or it takes multiple attempts before it eventually does.
  2. The starter motor makes a clicking sound but fails to engage the engine.


  1. Fuel delivery issues, such as a clogged fuel filter or a faulty fuel pump, can impede the engine’s ability to start.
  2. A weak battery or a loose connection can result in insufficient power reaching the starter motor.


  1. Check the fuel filter for any debris or blockages. If necessary, clean or replace it.
  2. Inspect the fuel pump to ensure it is functioning properly. Replace it if needed.
  3. Verify the battery’s charge level and connections. Recharge or replace the battery as necessary.

Problem 2: Mercury 9.9 Pro Kicker Overheating

Overheating is a serious problem that can potentially damage the Mercury 9.9 Pro Kicker if left unaddressed. It is crucial to promptly identify and resolve any issues related to engine overheating.


  1. The engine temperature gauge indicates higher than normal temperatures.
  2. The engine emits a warning alarm or displays a temperature warning light.
  3. The engine may lose power or shut down completely.


  1. Insufficient water flow through the cooling system, often caused by a blocked water intake or a malfunctioning water pump, can lead to overheating.
  2. Low coolant levels or a faulty thermostat can disrupt the engine’s cooling process.


  1. Check the water intake for any obstructions, such as weeds or debris, and clear them away.
  2. Inspect the water pump impeller for damage or wear. Replace it if necessary.
  3. Ensure the coolant levels are adequate and the thermostat is functioning correctly. Replace any faulty components.

Problem 3: Poor Performance at High Speeds

When your Mercury 9.9 Pro Kicker fails to deliver its expected performance at high speeds, it can be frustrating and hinder your boating experience. Identifying the underlying causes and implementing appropriate solutions can help you overcome this problem.


  1. The engine struggles to reach its maximum RPM (revolutions per minute).
  2. The boat experiences reduced speed or acceleration compared to previous performance.


  1. A propeller with the wrong pitch or damaged blades can limit the engine’s ability to generate sufficient thrust at high speeds.
  2. Restricted fuel flow, caused by a clogged fuel line or a faulty fuel pump, can result in poor engine performance.


  1. Evaluate the propeller size and pitch to ensure it is suitable for your boat’s specifications. Replace a damaged propeller if necessary.
  2. Inspect the fuel line for any blockages and clean or replace it as needed.
  3. Check the fuel pump’s functionality and replace it if it is not delivering fuel adequately.

Problem 4: Mercury 9.9 Pro Kicker Will Not Idle

One frustrating problem that Mercury 9.9 Pro Kicker owners may encounter is when the engine refuses to idle properly. An unstable or non-existent idle can make maneuvering in tight spaces or trolling at lower speeds challenging.


  1. The engine stalls or shuts off when idling.
  2. The idle speed fluctuates erratically.
  3. The engine requires constant adjustment of the throttle to prevent stalling.


  1. A dirty or clogged carburetor can disrupt the fuel and air mixture, leading to an unstable idle.
  2. Maladjusted idle mixture screws or idle speed settings can prevent the engine from idling smoothly.


  1. Clean the carburetor thoroughly to remove any accumulated debris or varnish. Use a carburetor cleaner and follow the manufacturer’s instructions.
  2. Inspect the idle mixture screws and adjust them to the recommended settings. Ensure they are properly balanced for a smooth idle.
  3. Check the idle speed adjustment and set it to the manufacturer’s specifications.

Problem 5: Mercury 9.9 2 Stroke Won’t Stay Running

Another frustrating issue that some Mercury 9.9 Pro Kicker owners may encounter is when the engine starts but fails to stay running. This problem can disrupt your boating plans and cause inconvenience on the water.


  1. The engine starts but shuts off shortly after.
  2. The engine exhibits erratic behavior, such as sputtering or misfiring.
  3. The engine struggles to maintain a consistent RPM.


  1. A clogged or malfunctioning fuel filter can restrict the flow of fuel, causing the engine to stall.
  2. A faulty ignition system, including spark plugs or ignition coils, can result in intermittent firing and engine shutdown.


  1. Check and clean or replace the fuel filter to ensure proper fuel flow to the engine.
  2. Inspect the spark plugs for wear or fouling. Clean or replace them as necessary.
  3. Test the ignition coils for proper functioning. Replace any faulty ignition components.


By addressing these common Mercury 9.9 Pro Kicker Problems, boaters can ensure a smoother and more enjoyable time on the water. 

Remember regular maintenance and careful inspection will help maximize the performance and longevity of this reliable outboard motor.

So now before I got I am suggesting another article I covered on – Mercruiser 7.4 MPI problem.

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