thanks guys... but fun is over ..
half hour ago I was cocky and while making U turn, instead driving 15 km/h , I try 30 and I hit the rock near the road and bent kart badly ...
rear right fell of rim, main frame is bent about 6-7 cm ...
I manage to get home slowly, use big hammer and bent it back in place...
test run show constant pulling to the left, front tyres do not have same thred any more and vibrations are terrible ...
Will try to weld L shaped profile to make it stronger...
Or, as its 3/4 pipe/ tube ( still mixing those two) try to put 1/2 pipe inside this one...