1998 25hp 2stroke mercury outboard

warrenchad24

Recruit
Joined
Jul 27, 2014
Messages
1
Running rough only when put into forward gear, runs fine in reverse. Forward gear runs as if ones cylinders missing or gears arn't meshing together smoothly like its jumping then finally locking in. Seems to only smooth out after a sudden cling at a high rpm. I threw muffles on and ran it out of the water which ran smooth when I put it into gear. So this seems to only happen under a load. I changed lower unit oil and there was only a small amount of very fine shaving. Would appreciate any ideas what this might be.
 
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