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The cylinder is taken over from the successful FC 250 motocross model and features the same 78 mm bore. It also houses a forged bridged-box-type piston, professionally engineered from high-strength aluminium. The compression ratio of 13.8:1, in combination with the state-of-the-art cylinder as well as cylinder head gasket, provides outstanding performance and reliability.
→Cylinder
== Cylinder ==
[[File: FE-250-cylinder.png | center | 400px]]
The cylinder head features advanced technology aimed at reducing weight and drag: from the low friction surface upon which the twin overhead camshafts rotate, to the four lightweight titanium valves - intake 32.5 mm, exhaust 26.5 mm - that are actuated by DLC (diamond like carbon) coated finger followers. This aids the engine to rev freely while maintaining smooth, efficient power throughout the rpm range.