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At the same Olympics he finished 27th in the individual road race.
At the same Olympics he finished 27th in the individual road race.
In the 1974 Tour de France, Karstens finished second in the fourth stage. Afterwards, he forgot to take the doping tests. The tour organisation set him back to the last place of the stage results, and gave him 10 minutes penalty time in the overall classification, which made him lose his third place.
One day later, the jury took the penalty time back.