SubGothius, I might be going down the same rabbit hole as you IF -- rebuilding my Mikuni carburetor does not solve my no start problem... I can't believe my truck went from running fine to no start, after touching the Mikuni carburetor (to replace the accelerator diaphram)

The gremlin was (not me) a heavy hand which lead to a cracked phenolic resin throttle body portion of the carb... After a second attempt (not me) to super glue the cracked GAS leak plastic a new gremlin began (super weird rough running upon cold start/like running on two cylinders) A third attempt to stop GAS from leaking was (not me) installing another Mikuni BUT that rough cold start gremlin was still there (it must be something other than a carburetor problem (thanks to a heavy hand?)

GRrrrrr

Gott love these trucks to keep at em -- good luck all on fixing your trucks
Aloha--
George