How Often Should You Replace the Spark Plug on a Gas-Powered Surfboard?
Gas-powered surfboards are thrilling machines that blend speed, water, and adrenaline into one unforgettable ride. But like any combustion-engine vehicle, their performance relies on proper maintenance—especially when it comes to the spark plug. For boards equipped with a 2-stroke 109 cc water-cooled twin-cylinder engine, using NGK spark plugs, knowing when and how often to replace them can make a huge difference in reliability and power.
Why Spark Plugs Matter for Your Jet Surfboard
The spark plug is the heart of the ignition system. It ignites the fuel-air mixture in the combustion chamber, powering your surfboard’s engine. Over time, deposits from fuel, oil, and moisture—especially in 2-stroke engines—can cause fouling, weak sparks, or misfires.
When this happens, you may notice:
Hard starting or poor ignition
Loss of acceleration power
Rough engine idling
Excessive fuel consumption
In short, a worn-out spark plug equals poor performance on the water.
Recommended Replacement Interval for NGK Spark Plugs
For a 2-stroke 109 cc water-cooled twin-cylinder engine, here’s the general guideline:
For recreational/leisure use (1-2 times per week), NGK spark plugs should be replaced after 25-30 hours of engine operation.
Heavy-duty/commercial use (rental or daily riding): Replace NGK spark plugs every 15-20 hours.
After Long Storage：Replace if plug is wet, corroded, or blackened Moisture and salt can corrode the electrode.
How to Tell When Your Spark Plug Needs Replacement
Replace it immediately if you notice any of the following:
The engine takes multiple pulls to start.
The plug tip looks oily, dark, or covered with carbon.
The electrode gap is larger than 0.7–0.8 mm.
Visible corrosion or rust from saltwater exposure.
Decreased acceleration or power at high RPMs.
Maintenance Tips to Extend Spark Plug Life
Use quality fuel and two-stroke oil with the correct mix ratio (KOOTU gas surfboard is 1:30).
Rinse and dry the surfboard thoroughly after every ride to prevent salt buildup around the ignition area.
Inspect and clean the spark plug every few sessions using a soft brush and brake cleaner—never scrape the electrode.
Store your board in a dry place and remove the plug if storing for long periods.
Check the gap before installation using a feeler gauge.
Final Thoughts
For the best engine performance, replace your NGK spark plug every 25–30 hours on a 2-stroke 109 cc water-cooled twin-cylinder surfboard engine—or sooner if you notice power loss or starting issues. Regular inspection and timely replacement keep your board running smoothly, protect the engine from fouling, and ensure every ride delivers the thrilling power it was designed for.
