The shop took off rust inside of fuel tank.
After received my R80RT from shop,I tried to ride but it stopped again.
Sudden stop on high way is dangerous,I managed to back to my garage.
And I thought fuel filter before calibrator could be short of fuel.
Enough fuel did not go to carburetor. So I could not run R80RT over 60km per one hour.
I will get rid of filter and replace it with genuine BMW fuel hose.