Honda 0.036 Spark Plug
GarageDex's powersports data shows the Honda 0.036 uses a CR125 spark plug, gapped to 0.028", or upgrade to the R0161-10 iridium plug. Spark plug fitment varies by year - see the table for each range.
Spark plug fitment by year
| Years | Standard plug | Iridium upgrade | Gap |
|---|---|---|---|
| 1990 | CR125 | R0161-10 | 0.028" |
| 1990 | CR125 | DR8EA | 0.028" |
| 1980 | CT90 | DR6HS | 0.028" |
| 1980 | S90 | DR8HS | 0.028" |
| 1980 | ST90 | BR7HS | 0.028" |
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 Honda 0.036
The recommended plug is a CR125. Match that code - spark plugs are thread-, reach-, and heat-range-specific, so the part number matters more than the brand. Worth considering: the R0161-10 iridium upgrade - it fits the same port, fires cleaner, and lasts far longer between changes.
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Frequently asked
What spark plug does a Honda 0.036 take?
GarageDex's powersports data shows the Honda 0.036 uses a CR125 spark plug, gapped to 0.028", or upgrade to the R0161-10 iridium plug. Spark plug fitment varies by year - see the table for each range.
What is the spark plug gap on a Honda 0.036?
The Honda 0.036 spark plug gap is 0.028". 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.
Are iridium spark plugs worth it on a Honda 0.036?
The R0161-10 is the iridium upgrade for the standard CR125. It fits the same port and heat range, fires more reliably, and lasts far longer between changes - a worthwhile swap for most riders, though the standard plug is perfectly fine if you change plugs on schedule.
Does the Honda 0.036 spark plug change by year?
Yes - the fitment differs across the years we cover: 1990 uses CR125; 1990 uses CR125; 1980 uses CT90; 1980 uses S90; 1980 uses ST90. 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.