KTM 660 Rally Spark Plug
GarageDex's powersports data shows the KTM 660 Rally uses a DR9EA spark plug, gapped to 0.028", or upgrade to the DR9EIX 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 |
|---|---|---|---|
| 2003-2004 | DR9EA | DR9EIX | 0.028" |
| 2001-2002 | DPR8EA-9 | DPR8EIX-9 | 0.035" |
660cc 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 KTM 660 Rally
The recommended plug is a DR9EA. Match that code - spark plugs are thread-, reach-, and heat-range-specific, so the part number matters more than the brand. Worth considering: the DR9EIX 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 KTM 660 Rally take?
GarageDex's powersports data shows the KTM 660 Rally uses a DR9EA spark plug, gapped to 0.028", or upgrade to the DR9EIX iridium plug. Spark plug fitment varies by year - see the table for each range.
What is the spark plug gap on a KTM 660 Rally?
The KTM 660 Rally 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 KTM 660 Rally?
The DR9EIX is the iridium upgrade for the standard DR9EA. 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 KTM 660 Rally spark plug change by year?
Yes - the fitment differs across the years we cover: 2003-2004 uses DR9EA; 2001-2002 uses DPR8EA-9. 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.