Upgrade your Mercury 2-stroke outboard engine for high-performance racing, river running, or shallow water applications with this precision-engineered thermostat delete kit.
Designed to replace your factory thermostats, this kit includes outlet restrictor washers and grommet seals to help fine-tune water pressure and cooling flow, ensuring optimal performance in extreme conditions.
✅ What’s Included (per kit): Two (2) Stainless Steel Restrictor Washers and Two (2) Thermostat Grommet Seals (62386)
💧 Kit Options – Choose Based on Desired Water Pressure:
Small (0.123" / 3.12 mm ID) – High Water Pressure for maximum cooling and high-flow performance. Ideal for factory race setups. (Recommended option – Factory Race PN: 475331)
Medium (0.168" / 4.27 mm ID) – Moderate Water Pressure balanced flow rate for performance tuning and general-purpose high-output builds. (Oversized option – PN: 47533)
Large (0.227" / 5.77 mm ID) – Lower Water Pressure designed for cold water conditions or where slower flow is preferred for engine warm-up. (Oversized option)
💸 Special Offer: Buy all 3 kits and save $5 – perfect for tuning or testing across different performance setups.
🔧 Compatibility: This thermostat delete washer kit is compatible with a wide range of Mercury 2-stroke outboard engines, and replaces the following OEM part numbers.
Compatible Mercury / Sierra / Aftermarket Part Numbers: 12-47533 1, 18-0182, 30610, 306162, 310058, 508633, 62386, 62386B, 62386001, 777381, 8M0204714, 9-60002, 62386
Contact Mike Hill at +1-714-697-1716 or email mike@buckshotracing77.com for technical support.