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The
original YS63 was a great engine. The YS 63-S
is better.
The YS
63-S is redesigned to run even better under
the toughest conditions. The regulator has been
repositioned to run cooler in harsh environments.
The
lower crankcase is stronger to prevent distortion
from high pressure. The new cylinder has no liner,
transferring heat better. The YS-63S is better, more
reliable under a wide range of conditions. |