Yamaha YZF-R1 2012, Service Manual

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FEATURES
1-5
Aims and advantages of using YCC-I system
• Improved power band
By using a dual intake funnel system, YCC-I optimizes the effectiveness of the fuel injection sys-
tem to deliver an incredibly precise air/fuel mixture to the combustion chamber. This degree of
intake volume control gives both improved low to mid-range power, as well as improved power in
the higher rpm range. In effect, the YCC-I offers higher levels of power across the RPM range.
• Electronically controlled intake length
The YCC-I system consists of four lightweight plastic resin funnels, and each of these is divided
into an upper and lower portion. Depending upon operating conditions, the funnels can be joined
to form a single long funnel, or split to create a short funnel. This change is performed instanta-
neously by an electrically controlled servo-motor which handles the function so smoothly that the
rider is unaware it is happening.
A. Down position (long intake)
(Low rpm to Mid rpm)
B. Up position (short intake)
(High rpm)