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  1. C

    Excessive oil loss through breather, '75

    Yes, only through the breather. Original Breather was in good condition, assembled correctly and not missing any parts, and Heiden Tuning breather saw no improvement.
  2. C

    Excessive oil loss through breather, '75

    I've had this bike for 2 years now. Last year ran it with worn out rings in the right cylinder and and oil loss out the exhaust. Had the top end rebuilt this spring by a older local mechanic who owned Yamaha dealership and shop in the 70s when these bike came out. Oil loss through the breather...
  3. C

    Crankcase vent using a reed valve.

    Did this solution work for you? looking at these myself.