Takazumi Katayama
Takazumi Katayama is a Japanese former Grand Prix motorcycle road racing world champion.Born in Kobe, Japan, he was the first Japanese rider to win a motorcycle road racing world championship when he claimed the 1977 350cc world championship aboard a Yamaha. In 1979 he accepted an offer from Honda to develop their exotic oval-cylinder, four-stroke NR500 race bike. After retiring from competition, Katayama became a motorcycle Grand Prix racing team owner.Races by year
| Year | Class | Bike | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | | Pts |
| 1974 | 250cc | Yamaha | GER | NAT | IOM | NED
Ret | BEL
3 | SWE
1 | FIN
5 | CZE
2 | YUG
Ret | SPA
Ret | | | 4th | 43 |
| 1976 | 250cc | Yamaha | FRA
DNQ | NAT
2 | YUG
Ret | IOM
2 | NED
2 | BEL
3 | SWE
1 | FIN
2 | CZE
3 | GER
7 | SPA | | 2nd | 73 |
| 1976 | 350cc | Yamaha | FRA
4 | AUT
Ret | NAT
10 | YUG
3 | IOM
9 | NED
Ret | FIN
DNS | CZE
11 | GER
4 | SPA | | | 7th | 28 |
| 1976 | 500cc | Yamaha | FRA | AUT
DNS | NAT | IOM
4 | NED | BEL
Ret | SWE | FIN
Ret | CZE | GER | | | 26th | 8 |
| 1977 | 250cc | Yamaha | VEN | GER
Ret | NAT
8 | SPA
1 | FRA
8 | YUG
2 | NED
6 | BEL
2 | SWE
4 | FIN
Ret | CZE
Ret | GBR
Ret | 4th | 58 |
| 1977 | 350cc | Yamaha | VEN | GER
1 | NAT
3 | SPA
3 | FRA
1 | YUG
1 | NED
Ret | SWE
1 | FIN
1 | CZE
Ret | GBR
Ret | | 1st | 95 |
| 1977 | 500cc | Yamaha | VEN | AUT
DNS | GER | NAT | FRA | NED | BEL
Ret | SWE | FIN | CZE | GBR | | NC | 0 |
| 1978 | 350cc | Yamaha | VEN
1 | AUT
3 | FRA
Ret | NAT
3 | NED
Ret | SWE
3 | FIN
2 | GBR
Ret | GER
1 | CZE
6 | YUG | | 2nd | 77 |
| 1978 | 500cc | Yamaha | VEN
Ret | SPA
3 | AUT
Ret | FRA
Ret | NAT
Ret | NED
4 | BEL
6 | SWE
3 | FIN
2 | GBR
9 | GER
5 | | 5th | 53 |
| 1979 | 350cc | Yamaha | VEN | AUT
Ret | GER | NAT | SPA | YUG | NED | FIN | GBR | CZE | FRA | | NC | 0 |
| 1979 | 500cc | Honda | VEN | AUT | GER | NAT | SPA | YUG | NED | BEL | SWE | FIN | GBR
Ret | FRA
DNQ | NC | 0 |
| 1980 | 500cc | Suzuki | NAT
6 | SPA
4 | FRA
6 | NED
Ret | BEL | | | GER
12 | | | | | 10th | 18 |
| 1980 | 500cc | Honda | | | | | | FIN
DNS | GBR
15 | | | | | | 10th | 18 |
| 1981 | 500cc | Honda | AUT
13 | GER
Ret | NAT
Ret | FRA
Ret | YUG | NED
Ret | BEL | RSM | GBR | FIN | SWE | | NC | 0 |
| 1982 | 500cc | Honda | ARG
6 | AUT
9 | FRA
DNS | SPA
6 | NAT
7 | NED
8 | BEL
Ret | YUG
5 | GBR
Ret | SWE
1 | RSM
Ret | GER
4 | 7th | 48 |
| 1983 | 500cc | Honda | RSA
Ret | FRA
Ret | NAT
5 | GER
2 | SPA
3 | AUT
4 | YUG
5 | NED
2 | BEL
4 | GBR
6 | SWE
3 | RSM
DNS | 5th | 77 |
| 1984 | 500cc | Honda | RSA | NAT | SPA | AUT | GER | FRA
DNS | YUG | NED
8 | BEL | GBR
8 | SWE
4 | RSM
Ret | 13th | 14 |
| 1985 | 500cc | Honda | RSA | SPA
Ret | GER
11 | NAT
DNS | AUT
14 | YUG
Ret | NED
Ret | BEL
8 | FRA | GBR | SWE | RSM | 17th | 3 |
