O.S. MAX 28XZPurpose designed from the outset to be raced in Truggies. The extra capacity over a .21 ensures maximum punch out of the corners and with 3.31PS she is no slouch down the straights either! The racing nature and increased capacity of this engine requires a slightly bigger flywheel than a .21. Carburation is courtesy of a smooth and responsive slide carburettor and an SG style crankshaft is standard. Requires the OS T style glowplug.
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