A fresh spark plug keeps the Royal Enfield Meteor 350 starting easily and running cleanly. The Meteor 350 uses a Bosch YR7MES / Champion RER6YCA (gap 0.7-0.8 mm) plug. Check it at every service; replace it if the electrodes are worn or fouled.
Always work on a cold engine — a plug removed from a hot head can damage the threads. Use a plug socket and work by hand until the plug seats.
Royal Enfield Meteor 350 quick service specs
| Item | Specification |
|---|---|
| Engine oil | 15W-50 (API SL, JASO MA2, semi-synthetic) |
| Oil capacity | 2.2 L |
| Oil change interval | 6200 miles |
| Chain slack | 25-30 mm |
| Spark plug | Bosch YR7MES / Champion RER6YCA (gap 0.7-0.8 mm) |
| Tire pressure (F/R) | 32 / 32 PSI |
| Battery | 12V 8Ah VRLA |
How to replace the spark plug, step by step
- Let the engine cool completely — never remove a plug from a hot engine.
- Remove the plug cap and clean around the plug — blow away dirt so it can’t fall into the cylinder.
- Unscrew the old plug with a plug socket — turn anti-clockwise; keep the socket straight.
- Check the gap on the new plug — set it to 0.7-0.8 mm with a feeler gauge if needed.
- Fit the new plug by hand first — thread it in by hand to avoid cross-threading, then tighten with the socket.
- Refit the plug cap — push it on firmly until it clicks.
- Start the engine and check it idles smoothly — a misfire means the cap isn’t seated or the gap is wrong.
Common mistakes to avoid
- Cross-threading the plug — forcing a plug that won’t turn damages the head — start it by hand.
- Over-torquing — too much torque cracks the ceramic — tighten to spec or a quarter-turn past hand-tight.
- Skipping the gap check — new plugs aren’t always gapped correctly — always check before fitting.
- Dropping dirt into the cylinder — clean around the plug before removing it.
FAQ
What spark plug does a Royal Enfield Meteor 350 use?
A Bosch YR7MES / Champion RER6YCA (gap 0.7-0.8 mm). Stick with the recommended heat range.
How often should I change the spark plug?
Inspect at every service and replace when the electrodes are worn, or per the service schedule.
Can a worn plug cause hard starting?
Yes — a fouled or worn plug is a common cause of hard starting and rough idling.
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Dan Heiman
Writer at Helmet Today, covering helmet reviews, fit and riding safety.
