1975 35hp wont start

Joined
May 30, 2008
Messages
20
i have a 1975 johnson 35hp ran Saturday now wont start.All wiring looks good carb is perfect,checked plug wires for spark and will jump 7/16 inch gap.it is getting fuel to the carb and to the plugs. so i pulled the plugs and put them to the block to see if they sparked they checked fine. when i try to start it it pops/cough every once and a while but will not start what might be my problem
 
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