currently level 135 merces what level would be good to solo zakum and how much mesos should be spent on gear

Depends on funding.

I was able to solo Zakum with my Merc at your level. I didnt attempt Zak Solo until 132 and it was fairly easy. I was Strless with decent gear.

Mesos spent depends on server.

well im level 137 now, as far as funding goes i plan to buy 2-4B mesos. possible to solo zakum with this meager funding lmk

Meager? It's more than enough. A good weapon and some decent % items, all you need really.

yeah with 2-4B you can easily solo zak. Just dont be dumb and touch Zak. Have All Cures ready and always keep your buffs on track.

NEVER, ever touch jump skills. One second you're farthest possible from him, next second you're huggin' him.