older Mariner engine

Richard 1968

Recruit
Joined
Jul 19, 2003
Messages
1
cranks fine, runs fine at low RPM ,and half throttle. Anymore than half it starts to miss and lose power.Cleaned filters,replaced spark plugs , still no help .Early 70 model,is the 50 to 1 ratio on the gas good or do I need to change ?
 
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