Answer
Feb 22, 2025 - 06:53 PM
You’ll want NGK BR8HS spark plugs for the Yamaha 650 WaveRunner III. That’s the factory-recommended plug, and it’s what I’ve always used.
Make sure to gap them correctly — should be around 0.6-0.7mm (0.024-0.028 inches). If the gap is off, you might get weak spark or rough running. Also, if you’re riding hard or in really hot conditions, some guys swap to BR9HS for a slightly colder heat range, but for most cases, BR8HS is the way to go.
Stick with NGK, avoid cheap knockoffs, and if you want extra longevity, you can go with iridium plugs (BR8HIX), but they’re not necessary unless you hate changing them often.
