Kawasaki KX125-M Spark Plug
GarageDex's powersports data shows the Kawasaki KX125-M uses a R6918B-8 spark plug, gapped to 0.024". Spark plug fitment varies by year - see the table for each range.
Spark plug fitment by year
| Years | Standard plug | Iridium upgrade | Gap |
|---|---|---|---|
| 2005 | R6918B-8 | - | 0.024" |
| 2004 | R7376-10 | - | 0.024" |
125cc motorcycle. Match the exact part code, thread reach, and heat range. The iridium column is the same-fit upgrade for a longer service life.
Spark plugs for your Kawasaki KX125-M
The recommended plug is a R6918B-8. Match that code - spark plugs are thread-, reach-, and heat-range-specific, so the part number matters more than the brand. Gap it to spec before it goes in and you're done.
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Frequently asked
What spark plug does a Kawasaki KX125-M take?
GarageDex's powersports data shows the Kawasaki KX125-M uses a R6918B-8 spark plug, gapped to 0.024". Spark plug fitment varies by year - see the table for each range.
What is the spark plug gap on a Kawasaki KX125-M?
The Kawasaki KX125-M spark plug gap is 0.024". Set the gap with a feeler gauge before install - iridium plugs come pre-gapped but always verify, since a wrong gap causes misfires and hard starts.
Does the Kawasaki KX125-M spark plug change by year?
Yes - the fitment differs across the years we cover: 2005 uses R6918B-8; 2004 uses R7376-10. Match your exact year in the table.
How often should I change the spark plugs on a motorcycle?
Standard plugs typically want replacing every 8,000-12,000 miles (or per your service manual); iridium plugs go much longer. Fouled or worn plugs cause hard starts, misfires, and poor fuel economy - a cheap part that punches above its weight.