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Thread: NSR powervalves don't close

  1. #1
    Join Date
    28th December 2004 - 19:18
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    06 r6, 690 ktm duke 3, rs125
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    nelson
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    736

    NSR powervalves don't close

    hi guys

    I just had a miserable time at the last race meet on my mc21

    hard starting, no power, traced to a range of faults including a stuck ring and and dead battery

    once these were sorted it appears the valves are still playing up and to be different they open but dont close

    My normal means of setting is to unplug the tps, yurn it on and the valves cycle to open

    This only happens now with the motor started and when moved to open they stay there regardless of revs etc

    we have checked the tps which appears to be working and swaped the servo motor out with one from my 28 (so know to be good) but no change

    Paul

  2. #2
    Join Date
    7th October 2011 - 20:01
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    bike sold :-(
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    napier
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    406
    check the feed from the cdi or coil feed that the unit uses to work out what RPM the engine is doing, sounds like the power valve is going to start position on turn on but then is not recognising that the motor is running.

  3. #3
    Join Date
    17th February 2005 - 11:36
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    Bikes!
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    Christchurch
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    9,649
    I don't know much about the PV system on an NSR, but I'm pretty sure they reverse the PV motor polarity to wind it backwards. I guess there' a couple of high power transistors inside the PGM doing the switching, and I guess it's possible you can burn one out but not the other. Try another PGM. If the PV has a position sensor (I expect it will, probably three wire, probably very similar to the TPS), move the PV wheel and double check that that feedback look is giving correct looking value (i.e. it'll probably give you something like 0.8-1v on closed and 4.2-4.6v on open, assuming a 5v sensor feed from the PGM (that is typical, but given the age could be an old style 12v, so check the (presumably) red wire feed to the PVPS.

    If none of that seems correct, sing out and I'll have a dig through the manual and see if there are any test procedures. (power feed from 2 wires an position sensing on another 3 wires is typical for this sort of stuff, but Honda is, ya know, Honda...)

  4. #4
    Join Date
    28th December 2004 - 19:18
    Bike
    06 r6, 690 ktm duke 3, rs125
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    nelson
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    i managed to find a test procedure for the servo and that was ok, tps tested ok as was the stator and pick ups

    took the plunge and got a pgm from deet in oz and it sorted it

    Reckon it sounds like I had the wrong steer on setting the valves, it was always

    unplug tps
    turn on
    servo moves to open
    set valves to open (stick finger in port to check)

    turns out that its not "fully" open and that the servo may have been adjusted wrong

    now lacking clarity on how to ensure valves reach full open though as the "setting" position is around 2/3rds open

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