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15 Answers
Kapil
| 5 years ago
You need to understand R3 is twin cylinder and RC390 is Single cylinder although power output is 2 bhp higher of RC390 but smoothness of twin cylinder and diamond chasis of ...read more
Karthik
| 5 years ago
RC 390 is the fastest in quick sprint. But R3 will beat it as it has high top speed than RC390.And R3 engine is more refined than any KTM Engine