1990 Yahama 9.9hp 4 Stroke, grinding in reverse

[DeanHensler]

I removed the lower unit and changed the impeller and gear oil. All went well and I put the motor back together. Now when I go to reverse it engages, then if I give it much throttle it grinds really bad. If I go to neutral and back to reverse it will engage again, but grinds any time I throttle it up.

When I removed the lower unit I made note of where the gear selector was and put it back as close as I could to the same adjustment. Any idea why this is happening now all of a sudden? The engine never had problems before.

Also it is remote controlled, no tiller.

Thank you for your help.

 

[robert graham]

Remove lower unit, find neutral on lower unit by turning shift shaft while turning prop shaft....then put remote in neutral, replace lower unit and you should be good to go...hopefully