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Max RPM 81 Seca

Discussion in 'XJ Technical Chat' started by robvoi, Feb 21, 2012.

  1. robvoi

    robvoi Member

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    Hi guys,

    I have a '81 550 Seca, 18,700 miles, the had been out of commission for 19 years. I am afraid of going up to 7000 RPM in case something breaks.
    Any suggestion how to re-'brake-in' a bike like this.
    I had most of the major work done, so that the engine actually runs decently.

    Thx :?
     
    robvoi, Feb 21, 2012
    #1
  2. mtnbikecrazy55

    mtnbikecrazy55 Active Member

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    7k? These bikes were made to run at high rpm's, 7k is nothing. :D
     
    mtnbikecrazy55, Feb 21, 2012
    #2
  3. iwingameover

    iwingameover Active Member

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    In proper tune and maint performed, valves checked?

    You haven't even awoken the beast at 7K.

    Max Power
    37 KW 50 PS @ 9000 rpm
    Max Torque
    41.9 Nm 4,3 m-kg @ 7500 rpm
     
    iwingameover, Feb 21, 2012
    #3
  4. robvoi

    robvoi Member

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    Thanks guys, just worried that the engine, sitting for 18 years might go into shock when asked to go to those RPMs
    I actually like this bike and don't want to break after a few miles
    thx again 8O
     
    robvoi, Feb 21, 2012
    #4
  5. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Peak power from a 550 Seca is at redline, 10K. I run both of mine to 10K all the time; but they're in a proper state of tune.

    Once the motor is in a proper state of tune (valves in spec, float levels in spec, sync'ed, etc.) you won't hurt it at all redlining it with regularity.

    You might want to hold off on winding it quite that tight until everything's in spec tho.
     
    bigfitz52, Feb 21, 2012
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  6. robvoi

    robvoi Member

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    Thank you bigfitz; I need one more tune up/overhaul
     
    robvoi, Feb 21, 2012
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  7. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Be sure the valves are in spec, the camchain's adjusted and you're not running lean and then ROMP on it! These motors are actually "happier" ABOVE 6K once properly tuned.
     
    bigfitz52, Feb 21, 2012
    #7

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