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To get the absolute maximum out of the Yamaha & Minarelli YI engines this cylinder head from Naraku with 66mm Ø is indispensable. The cylinder head is designed for use with the 200cc Ceramic cylinder kit from Naraku.
More clearance, reinforced valve springs and larger valves (22/25mm) allow the cylinder to breathe properly. The use of another fuel injector like the Malossi Force Master II is absolutely mandatory!
The cylinder head has no possibility to mount the lambda sensor. This results in any case an error in the control unit & a wrong calculation of the injection amount! We recommend to drill a hole in the exhaust manifold and weld a nut to fix the Lambda sensor directly in the manifold. Make sure that the sensor is mounted as close as possible to the cylinder head!
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