yamaha 15hp coming out of gear

[kei9th]

first i would like to thank everyone for helping me get my motor running. it definitely needed the carb cleaned and rebuilt also the fuel pump redone. now i get wot and perfect idle, but now my motor seems to have come out of gear. at full throttle it sounded like a go kart with a popped chain. at anything over quarter throttle that happens do i need to add gear oil and where would i check? these are the numbers for the motor 15SJ
684CS
043279
THANKS ALL kei9th

 

[kei9th]

Re: yamaha 15hp coming out of gear

thanks for all suggestions, i spun the hub