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50,000 Mile Cylinder Measurements on 550

Discussion in 'XJ Technical Chat' started by RangerG, Oct 29, 2020.

  1. RangerG

    RangerG Member

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    Location:
    Lloydminster, Saskatchewan
    This fall I tore down the top end of my 550 Seca. 79,000 kms, or 49,000 miles on it. It just didn’t have the power it used to.
    We measured up the cylinders with the hope that they would be in spec and I could just re-ring it.
    Great results!
    Factory spec for bore is 2.244”
    Wear limit is 2.248”
    Taper max is 0.002”
    #1 Top 2.246
    Mid 2.246
    Bottom 2.244
    #2 Top 2.246
    Mid 2.246
    Bottom 2.244
    #3 Top 2.245
    Mid 2.246
    Bottom 2.244
    #4. Top 2.245
    Mid 2.246
    Bottom 2.244

    So we were able to order standard rings an install them. Cleaned up the valve faces and seats and new guide seals.
    Only 50 kms on it since assembly and I’ve taken it to about 8,000 rpm once. The old kick certainly seems to be back.
    Looking forward to finishing break in and leaning out a rich condition. I think it’s gonna be a fun bike to ride again.
     
    RangerG, Oct 29, 2020
    #1
    dkavanagh likes this.

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