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How to find out the year my Rotax 503 engine was made?

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C

CCCP

Well-Known Member
Joined
Jul 8, 2012
Messages
79
Location
MS
Hello. I am rebuilding a rotax 503 and am in need of finding the year make. Is there any definite way to find out by the serial number when my engine was made? Also, are 503 UL crankshafts interchangeable with ski doo 503's crankshafts? Thank you
 
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