| Name | Country | Years | Races | Wins | Championships |
|---|---|---|---|---|---|
| Kauhsen | Germany | 0 | 0 | 0 | |
| Ken Downing | 1952 | 1 | 0 | 0 | |
| Ken Kavanagh | 1958 | 1 | 0 | 0 | |
| Ken Wharton | 1953 | 5 | 0 | 0 | |
| Klenk | Germany | 1954 | 1 | 0 | 0 |
| Kojima | Japan | 1976-1977 | 2 | 0 | 0 |
| Kurtis Kraft | United States | 1950-1960 | 12 | 5 | 0 |
| Kuzma | 1951-1960 | 10 | 1 | 0 |
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