Sikk CY26 
Chung Yang CY26
4+ HP Watercooled Engine
The brand-new 2008 Chung Yang CY26 watercooled engine is a 25.4cc (34mm bore, 28mm stroke) 18,000+ RPM performance machine.
It features a red silicone spark plug cap, new blue gaskets, high-flow water jacket, 4 transfer port 34mm cylinder, high-performance single-ring piston, Walbro WT-771 carburettor (15.88mm bore, 12.7mm venturi, adjustable high and low jets), improved cylinder plating, and more! Estimated engine power output is approx 4 HP.
Engine mounts and throtal linkages are included, as shown. Air filter and muffler not included.
Requires 90 octane (using the R+M/2 octane rating method) or higher fuel.
Note: these Chung Yang engines are also known as "Sikk" engines,
as Sikk is a major importer of these products.
$400