Maverick Vinales dedicated his victory at the Malaysian Grand Prix on Sunday to the young rider who died at the Sepang International Circuit.
On Saturday Afridza Munandar, 20, died after a crash in a feeder competition for MotoGP.
"My condolences to all the family," said Vinales.
The Spaniard held off world champion and compatriot Marc Marquez, who finished second, to win the race with Italy's Andrea Dovizioso in third.
Marquez, who secured his sixth world title by winning in Thailand last month, finished second after starting 11th.
His points tally of 395 is now a new season record, eclipsing Jorge Lorenzo's 383 in 2010.
"Once he [Vinales] took [a lead of] one-second-and-half, I tried to keep there but then I did a mistake and it got to two-seconds-and-half. I'm happy for my race," said Marquez.
He added: "We cannot forget Munandar, he was a young rider."
The final race of the season will take place Valencia on 17 November.
Meanwhile, Alex Marquez, the younger brother of Marc Marquez, won the Moto2 championship at the Malaysian Grand Prix.
Alex finished second to South African race winner Brad Binder on Sunday to secure a title Marc won in 2012.
Malaysia MotoGP results:
1. Maverick Vinales (Spa/Yamaha) 40mins 14.63secs
2. Marc Marquez (Spa/Honda) +3.059secs
3. Andrea Dovizioso (Ita/Ducati) +5.611
4. Valentino Rossi (Ita/Yamaha) +5.965
5. Alex Rins (Spa/Suzuki) +6.350
6. Franco Morbidelli (Ita/Yamaha-SRT) +9.993
7. Fabio Quartararo (Fra/Yamaha-SRT) +12.864
8. Jack Miller (Aus/Ducati-Pramac) +17.252
9. Danilo Petrucci (Ita/Ducati) +19.773
10. Joan Mir (Spa/Suzuki) +22.854
1. Marc Marquez (Spa/Honda) 395 points
2. Andrea Dovizioso (Ita/Ducati) 256
3. Maverick Vinales (Spa/Yamaha) 201
4 Alex Rins (Spa/Suzuki) 194
5. Danilo Petrucci (Ita/Ducati) 176
6. Fabio Quartararo (Fra/Yamaha-SRT) 172
7. Valentino Rossi (Ita/Yamaha) 166
8. Jack Miller (Aus/Ducati-Pramac) 149
9. Cal Crutchlow (GB/Honda-LCR) 133
10. Franco Morbidelli (Ita/Yamaha-SRT) 115