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All Products > "L-OS13951 OS O.S. MAX 21XZ-M"



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Based on the .21XZ-R's performance at the 2011 IFMAR 1/8 scale On-Road World Championships, the .21XZ-M Inboard Marine Engine takes that race-winning technology and applies it to dominating .21-size boat competition! Many of the performance features found on the .21XZ-R are here; by utilising a water-cooled cylinder head and big-bore carb, the .21XZ-M will assert itself on the water with the same resounding success!

Key features include a blue anodized, water cooled cylinder head plus a 21D big-bore carb, allowing for the use of high-nitro fuel. The crankshaft is silicone-filled for more efficient intake; two tungsten weights provide optimum balance for low and mid-speed torque. The cylinder liner has seven scavenger ports and three exhaust ports, for better, more efficient combustion. The piston is balanced and lightened, and the con rod had been made more durable.


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Part No: L-OS13951
Item Name: OS O.S. MAX 21XZ-M
Brand: OS
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