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Bel-Ray Thumper Racing Synthetic Ester Blend 4T 15W-50 4L is a high-performance engine oil designed for modern 4-stroke, single-cylinder, multi-valve racing engines. It combines premium synthetic esters with highly refined mineral base oils to provide maximum anti-wear protection for valve trains, rings, cylinders, and pistons. This oil delivers consistent clutch performance and meets API SN and JASO MA2 standards, making it suitable for both air-cooled and liquid-cooled engines with wet clutches .

For the best and fastest service, please give us a call so we can assist you using your vehicle’s VIN (chassis number).
  • Κωδικός: 99530-B4LW
  • Availability: Available
53.07€

Bel-Ray Thumper Racing 4T 15W-50 4L – Ester Synthetic Oil for 4-Stroke Off-Road & Racing Engines

Ultimate performance and protection for single-cylinder, high-RPM engines

Bel-Ray Thumper Racing 4T 15W-50 is a top-tier ester-based full synthetic oil engineered for the extreme demands of 4-stroke off-road, motocross, and racing motorcycles. Specially formulated for single-cylinder, high-performance engines, it offers outstanding thermal stability, reduced wear, and maximum power delivery.

Certified to API SN and JASO MA2, it ensures optimal wet clutch performance, smooth gear shifts, and long-lasting engine cleanliness, even under harsh competition conditions.


Key Features & Benefits:

• Ester synthetic blend – maximum protection under high temperatures and loads
• Designed for high-revving, single-cylinder (thumper) off-road engines
• Viscosity grade 15W-50 – balanced flow and film strength in all conditions
• Meets API SN / JASO MA2 – compatible with wet clutches
• Reduces friction and wear – ideal for motocross, enduro, and supermoto
• 4L packaging – ideal for full engine oil changes


Bel-Ray Thumper Racing 4T 15W-50 – for riders who demand factory-level performance and racing reliability.

  • Application4T Engine Oil
  • SpecificationsJASO MA2, API SN
  • Viscous15w50
  • TypeSynthetic
  • Pack Size4 lt