I am new to boating and retirement. Bought a used 12 ft aluminium boat and 6 HP Chrysler model 62 HH, serial 16166. After 1 hour out, motor slowed down. Took it to the shop and they said there was no spark and compression 70 on one side and 45 on the other. Said too expensive to fix. Is it worth rebuilding? Can I still get parts for this 1971-78 motor? Reasonably confident I could do it myself, however never worked on boat motors before.<br />Thanks, Ralph