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What exactly is YICS?

Discussion in 'XJ Technical Chat' started by burtmonro, Jul 19, 2007.

  1. burtmonro

    burtmonro New Member

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    I purchased my 1982 XJ1100 a couple of months ago. There's a few things about it that I haven't worked out quite yet. I think YICS means Yamaha Induction Control System, so I'm assuming it has something to do with air intake. Sorry if this question has been discussed to death already, but I couldn't find an answer by searching. Anyone know of a link that would explain it, maybe?
     
    burtmonro, Jul 19, 2007
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  2. kontiki

    kontiki Member

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    It has been discussed and you can search the forums to find lots og detailed info, but the short version is that is was a method of internal air passages within the head that attempted to equalize fuel-air intake between the 4 cylinders... sort of balance them for smoother operation.
     
    kontiki, Jul 19, 2007
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  3. Nick

    Nick Member

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    If you do a search for YICS you should find a ton of threads on it!

    Here's a few that I dug up for you.....

    http://www.xjbikes.com/Forums/viewtopic ... =yics.html

    http://www.xjbikes.com/Forums/viewtopic ... =yics.html

    http://www.xjbikes.com/Forums/viewtopic ... =yics.html

    http://www.xjbikes.com/Forums/viewtopic ... =yics.html
     
    Nick, Jul 19, 2007
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  4. Chared03HD

    Chared03HD Member

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    Location:
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    Y = Yamaha
    I = Induction
    C = Control
    S = System

    Basically a vacume balance port between the carbs on the engine side before the cylinders.....

    Or as everyone else is so quick to point out.... run a search!
     
    Chared03HD, Jul 20, 2007
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  5. Ltdave

    Ltdave Member

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    i asked the guys i rode with back when i bought the bike "what exactly does YICS stand for?"

    the answer was
    funny, one ran an 82 SECA turbo and the other a 600 FZR...

    i got this license plate for it since it had a YIKES Motor on it...

    [​IMG]

    david
     
    Ltdave, Jul 25, 2007
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