R Stage Big Bore Kit 88cc

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Bore Diameter: 52mm
Compression Ratio: 12.0: 1

Included Camshaft: F-10 Set of R stage head kit, cylinder kit and F-1 camshaft kit..


Based on standard head shape, adopt large diameter valves intake: 26mm / Exhaust : 22.5 mm. (Genuine valve is intake : 2 mm / Exhaust : 16 mm)
SP TAKEGAWA Original cylinder head.
Port : Port diameter of NORMAL HEAD is both 2 mm of intake / Exhaust whereas port diameter of R Stage is of large diameter, Intake: 26 mm / Exhaust : 22.5mm.
Port also adopts three dimensional port size and smooth flow of intake and exhaust gas is possible with valve port becoming large diameter.
Valve : Intake : 26mm / Exhaust : 22.5 mm Valve shaft diameter: 4.5 mm
Valve spring : For R Stage head, adopt optimal spring rate progressive rate spring valve spring (two stage pitch) and avoid to occur surging when of high rotating speed.
Adopt durable steel made valve spring retainer.


HONDA MONKEY FI (AB27-1900001-)


* If there may be an instruction manual included, it will be written in Japanese.


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