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NGK Spark Plug - LMAR8C9 - (10), image 1

NGK

NGK Spark Plug - LMAR8C9 - (10)

Spark PlugsSKU NGK-LMAR8C9

Cheapest we found

$21.85

at XPERT Moto Gear

$21.85 lowest$33.65 highest

3 recent in-stock prices · spread $11.80 (54%)

Based only on in-stock prices checked in the last 30 days. 3 stores checked; dates for every store are shown below.

Recorded store prices

Prices we recorded when we last checked each store for this exact variant.

XPERT Moto Gear$21.85CheapestIn stockCully's Yamaha$31.49In stockmay be out of dateRiders Market$33.65In stock

Product details

The 98% pure copper core delivers increased heat dissipation for more reliable starts and reduced risk of overheating. While cold-rolled threads prevent cross-threading and damage to cylinder heads and a trivalent plating eliminates the need for anti-seize. Complete with a high-grade alumina silicate ceramic.

One strategy for extending the service life of a standard nickel spark plug is to equip it with multiple ground electrodes. With such spark plugs, the spark continually jumps over to a different ground electrode. In doing so, the wear is distributed to up to four ground electrodes and the service life is extended.

  • Spanner Size: 14 mm
  • Thread Size: M10 x 1.0
  • Thread Length: 26.5 mm
  • Spark Plug Features:
    • Nickel Middle Electrode
    • 1 - Earthed Electrode
    • Interference Suppression: 5 kOhm
    • Gasket seat
    • Spark Position: 3 mm
    • Fixed SAE connector

Price history

Recorded changes for this exact variant.

Step chart of dated store-price observations. Solid lines show confirmed crawl coverage, dashed lines show overdue missed-check spans, and every line stops at the last confirmed price.

  1. 1XPERT Moto Gear6 points · last checked 22 Aug 2026
  2. 2Cully's Yamaha3 points · last checked 14 Aug 2026
  3. 3Riders Market1 point · last checked 20 Aug 2026

Solid steps show periods confirmed by the store’s change-only price history and completed crawl record: if the price had changed at a check, another point would appear. Dashed steps show overdue periods with no completed crawl confirmation. Every line stops at that listing’s last confirmed check and is never extended to today. Prices are not live and may have changed since the last point shown.

How we collect and compare prices
Cheapest we found: $21.85 · XPERT Moto GearJump to comparison