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Missing tacho drive

Discussion in 'XJ Technical Chat' started by Andyam5, Aug 11, 2013.

  1. Andyam5

    Andyam5 Member

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    Hi fellas, here's the thing I'm having nightmares about this week

    I have recently acquired a UK spec XJ650 4KO, pretty much the equivalent of the US Seca. Originally this had a non-YICS motor but at some point in it's history it's head has been swapped for a YICS version, just the head, the rest is the original motor.

    Now as far as I can see the non-YICS motor's tacho drive was built into the front of the head, somewhere around the exhaust camshaft but the YICS version connected somewhere different. So, because of the head swap I now have nowhere to connect the tacho cable :cry:

    1. Anyone got any ideas of how to get around this?

    2. Out of pure interest, where does the tacho cable connect into a YICS motor?

    3. What were Yamaha thinking?

    Any help will be hugely appreciated, cheers, Andy
     
    Andyam5, Aug 11, 2013
    #1
  2. maverickbr77

    maverickbr77 Member

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    The new head came off a model with an electronic tach.
     
    maverickbr77, Aug 11, 2013
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  3. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    So three are three routes to take.

    1. install an electronic tach; either a stock one or aftermarket.

    2. Install a non-YICS head.

    3. Install an electronic rev-limiter, set to 9K, and don't have a tach.

    #1 is the cheapest to do, but you'll have to wire it in yourself.

    There is a #4, but I wouldn't do it personally. Shift by ear.
     
    k-moe, Aug 11, 2013
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  4. Andyam5

    Andyam5 Member

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    Thanks guys
    I didn't know that YICS models had electronic tachos, that certainly looks like the best option. Cheers
     
    Andyam5, Aug 12, 2013
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