Yamaha G16 Ignition Coil Problems

The Yamaha G16 ignition coil problems have been a source of frustration for many golf cart enthusiasts and owners. The ignition coil is a critical component in the engine’s ignition system, responsible for providing the necessary spark to ignite the fuel-air mixture. 

However, numerous reports and anecdotal evidence suggest that Yamaha G16 models are prone to ignition coil failures, leading to intermittent or complete loss of power.

With mounting instances of premature failure in these specific models, there arises a need for comprehensive diagnostics and proactive maintenance measures. By shedding light on these issues, we aim to equip readers with valuable insights into troubleshooting techniques and potential solutions. 

Read also: Common Weak Ignition Coil Symptoms You Should Be Aware Of

Yamaha G16 Ignition Coil Problems

Yamaha G16 Ignition Coil

Since ignition coils are located near the engine and exposure to heat and vibration, they are prone to failure over time. While some may attribute these issues to simple wear and tear, others argue that it could be a design flaw that Yamaha needs to address. Let’s have a look at what the users reported. 

Losing Power When The Engine Gets Hot

Several G16 golf cart owners complained about the vehicle losing power after running for a certain period, usually 15–20 minutes. In other words, the issue occurs when the vehicle gets hot, causing it to stutter and lose power with the pedal down. 

The problem comes and goes, but sitting for a while temporarily resolves it. Many of them have tried various fixes, including replacing the coil, cleaning the choke, and checking the wiring, but the issue persists. 

After examining some cases like this, it was revealed that the issue was connected to a bad ignition coil, especially when aftermarket coils were installed. These aftermarket coils may not be designed to handle the heat generated by the G16 engine, causing them to malfunction after continuous use.

To address this recurring issue, it is recommended that G16 golf cart owners replace their aftermarket ignition coil with an OEM (Original Equipment Manufacturer) coil specifically designed for the vehicle model. 

The OEM coil has been tested and proven to withstand the heat produced during operation, ensuring reliable performance even in challenging conditions. Additionally, proper installation of the ignition coil is crucial. 

Golf cart owners are advised to carefully follow the manufacturer’s instructions when replacing or installing any electrical component in their vehicle. This includes checking and securing all wiring connections, as loose or faulty connections can also contribute to power loss problems.

Sporadic Engine Running

A significant amount of users complained about issues with a Yamaha G16’s coil and igniter, leading to sporadic engine running. One common complaint mentioned by several users was the failure of aftermarket coils shortly after installation. 

Many invested in replacement coils from third-party manufacturers with high hopes of resolving the problem, only to find that these too would malfunction after approximately an hour of use. This pattern indicated a deeper-rooted issue within Yamaha’s coil and igniter system.

The concerning frequency at which these failures occurred solidified users’ concerns regarding their vehicle’s overall integrity. To rectify this issue, Yamaha promptly issued a recall for all affected G16 models that were equipped with the faulty coils. 

They established a process for customers to bring their vehicles into authorized service centers, where certified technicians would replace the defective parts free of charge.

Simultaneously, Yamaha addressed concerns regarding aftermarket coils by clarifying that they cannot guarantee compatibility or performance of non-genuine parts. 

While it is understandable that some users may seek cost-effective alternatives, using aftermarket components might compromise system integrity and lead to similar issues experienced with earlier versions of the coil.

Weak Spark

Weak sparks have become a common problem in Yamaha G16 golf carts. Some owners expressed their frustration regarding the issue, as it persists even after replacing ignition coils. As an initial assumption, the single terminal with a blue wire and a black ground wire configuration might be causing the issue. Besides, Improper installation, specifically the gap setting, may have led to coil burnout and leading to weak spark.

Additionally, faulty wiring or loose connections could also be at fault. It’s crucial to inspect all electrical connections related to the ignition system thoroughly. Any frayed wires or loose terminals should be repaired or replaced accordingly. Sometimes, simply cleaning and tightening these connections can significantly improve spark strength.

How to Fix Ignition Coil Problems in Yamaha G16 Golf Cart

Unlike many other components of your golf cart, there is no way to repair ignition coils. The only way to get rid of the issue is to replace the bad one. However, you have to identify the bad ignition coil first. So, we’ll discuss the testing and replacement process sequentially below. 

Testing the Ignition Coil

To begin testing the ignition coil in a Yamaha G16 golf cart, start by locating the ignition coil. It is typically positioned near the engine and is connected to the spark plug wire. Next, disconnect the spark plug wire from the spark plug and remove the ignition coil from its mounting bracket.

Use a multimeter set to measure resistance (ohms) to test the primary and secondary windings of the ignition coil. Measure the resistance between the positive and negative terminals to check for continuity in the primary winding, which should fall within a specific range according to manufacturer specifications.

Next, measure the resistance between the positive terminal and the high-tension terminal to assess continuity in the secondary winding. Again, compare this value with manufacturer guidelines for an accurate assessment.

Additionally, inspect for any visible damage or corrosion on the ignition coil that may indicate malfunction. If any part of these tests fails or falls outside acceptable values, it likely indicates a faulty ignition coil that requires replacement.

Replacing the Ignition Coil

Replacing the ignition coil in a Yamaha G16 golf cart involves several steps. Start by disconnecting the negative battery terminal to prevent electrical shock. Next, locate the ignition coil. 

Use a socket wrench to remove the bolts holding the ignition coil in place. Carefully disconnect the wires connected to the coil, taking note of their positions for reassembly.

After removing the old ignition coil, install the new one in its place, ensuring it is securely fastened with the bolts. Reconnect the wires to their respective terminals on the new coil and make sure they are tightly secured.

Once installed, reattach the negative battery terminal and test the ignition system to ensure the proper functioning of the new coil. Start the golf cart and check for any signs of misfiring or rough running that would indicate a faulty installation.

Related: Should I Replace Ignition Coils With Spark Plugs?

Final Words

Yamaha G16 ignition coil problems present significant challenges for owners of this golf cart model. The frequent issues of failing coils and resultant issues can lead to frustrating downtimes and costly repairs. 

It is important for owners to be aware of these potential issues and to regularly maintain their vehicles to prevent such problems from occurring. Seeking professional help from a certified technician is crucial in diagnosing and resolving any ignition coil issues.

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