96 Mariner 115 hp outboard no power under load

tolongatsea

Recruit
Joined
Jun 17, 2012
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I have a 96 mariner 115 outboard and when it runs it idles fine and runs smooth but I have no power with throttle wide open. RPM's will not go over 4000, it is very sluggish and little acceleration. This motor used to snap you back in to the seat. It is like it is not firing on all the cylinders. I have spark to all 4 cylinders. I have heard rumors this is a 2+2 engine that cuts out the lower 2 cylinders at below 2000 RPM but I have found nothing to confirm this. How can I confirm this and how to troubleshoot this engine?

Thanks,
Jim.
 
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