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Making his race debut in 2011, Harjono became a two-class champion in just two years by winning the 110cc and 125cc championship titles in 2013 in Indonesia's premier racing category of INDOPRIX. Then in 2014, he took a 2nd-place podium finish in the Suzuka 4 Hours Endurance Road Race held in conjunction with the Suzuka 8 Hours Endurance Road Race, Round 2 of the FIM Endurance World Championship. These and other achievements on the racetrack have made him one of Indonesia's top riders. He sees the ARRC as another step towards becoming a world-class contender.

2015 Pre-season Comments
"I'm very happy to be chosen as a rider for the ARRC. There are so many new challenges ahead for me, including not only the switch from racing in Indonesia to greater Asia but also the switch from underbones to a 250cc supersport bike, and then the eventual step-up I'm aiming for to a 600cc supersport bike. From here, we plan to carry out machine testing thoroughly so we can enter the opening round in good condition. When the season is fully underway, I'll be aiming for podiums and to eventually become the first champion of the new Asia Production 250 Class!"

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A talented young hopeful who began racing in 2011, Pratna already has racing success in 250cc and 600cc supersport competition in Indonesia, and has taken a big step forward as a rider with a victory in the 2014 Suzuka 4 Hours Endurance Road Race held in conjunction with the Suzuka 8 Hours Endurance Road Race, Round 2 of the FIM Endurance World Championship. For 2015, he will be competing in the ARRC with the aim to grow more as a rider and eventually compete on the world stage.

2015 Pre-season Comments
"I'm really glad to be able to compete in the ARRC. This is a chance to show that I can compete at a higher level and I'm really excited about it. I'm aiming for the title! I'll have to put in 110% so I can always be in front, just like Yamaha's slogan in Indonesia of Semakin Di Depan (one step ahead). My preparations are going well and I'm training by riding motocross and flat track so I can be in my best condition for the season. I want to demonstrate what we Yamaha riders can do through my race results."

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He is a young rider who will turn 16 this year. Despite his relatively short racing career, Pratama has already won the 2013 championship title in the Yamaha Cup Race series in Indonesia, and ranked 3rd for the 2014 season in the 125cc class of INDOPRIX, Indonesia's premier racing category. This potential he has shown is the reason he was selected to compete as an ARRC rider. Everybody is looking forward to seeing how he will perform and grow as a rider this season.

2015 Pre-season Comments
"I'm very happy to be selected to race in the ARRC and, most of all, to be able to race with some of Asia's top riders. This is a new challenge for me and while I'm nervous now, the ARRC is just like every race I've been in until now: you give it everything you've got. It'll be important for me to gain experience throughout the season, but entering the series already means I'll be aiming for podiums, wins and the title; I'm training every day to prepare. I hope to learn more about riding techniques and machine set-up, to grow as much as I can and to get some good results on the track."