back to kart ..
as TC finally arrived, mounting wasn't straightforward ..
first shaft was 20 mm and TC was 3/4'' ..
after that solved, shaft was too short , that was solved as described in other thread ..
as motor was off , I cleaned carb , found new exhaust, put new throttle linkage, replace fuel line and decided to put engine back to frame ..
and guess what, TC sprocket goes straight to the frame ..
hopefully, I will be able to put big axle sprocket between this two rails, remove cross bar and put it further back and figure out how to keep bearing holder strong .. maybe put additional bearing on other rail to distribute stress ...
but have to make keyseat on axle ..
also put smart solution air filter

until find direct holder ...
anyway, few pictures ..