no spark after warmed up

wayne 15

Cadet
Joined
Aug 6, 2003
Messages
10
my 1970 115 hp evinrude loses spark after i run it for 15 or 20 minutes. the motor is not hot when i loss spark i can hold my hand on the cylinders.when let sit for a few minutes it will restart. i have changed the coil,motor had no spark when i bought it, the coil fixed that but now i have this problem.any help would be apresiated.
 
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