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This is the 91 SR helicopter engine from Y.S. Engines. This is a super powerful 90 size engine that fits all helis that accept an O.S. 90 size engine, such as the T-Rex Nitro 700, Thunder Tiger Raptor 90 or JR Vibe 90.

Key Features

• Long Stroke design for more power
• New rear bearing for longevity
• Balanced crankshaft for a smoother run
• Pressurized and regulated fuel injection system

Specs

• Displacement:14.89cc
• Bore:27mm
• Stroke:26.0mm
• Engine (Only) Weight:553 grams