- Aluminium heat sink for better cooling with 18 drilled holes
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- The crankshaft is now turbo for improved flow of the gases and has tungsten weights for improved balance
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- The crankshaft has a special outside coat for improved durability
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- The cylinder, piston & conrod are made of ABC and modified by OS Engines
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- The back plate is made of machined aluminium with a special coating
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- The newly reshaped crankcase core ensures smoother air flow and more consistent performance
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- The carburettor is made of aluminium with a special outside coat with aluminium inserts
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- The OS SPEED Tuned logo is present in the top of the cooling head
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- Ceramic rear crankshaft bearing for improved durability
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- Uses Turbo glow plugs ( OS P3 & P6 recommended )
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Technical Specifications:
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- Rotations Per Minute: 3.000 - 40.000
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OS Speed Tuned 21 VZ-B V Spec II ( World Champion )
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6, 7 and 6,5mm aluminium carburettor restrictors
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Silicone gasket for 3.5cc engines
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Plastic covers for carburettor and exhaust
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Decompression head gasket to use with 30% nitro fuel
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The crankshaft is 2mm shorter then the previous model.
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Copyright 2000 - 2009 All rights reserved
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