| Feature | Specification |
|---|---|
| Production Years | 2017 – 2020 |
| Engine Type | 847cc CP3 Inline-3, Liquid-cooled |
| Oil Specification | SAE 10W-40, API SG+, JASO MA |
| Oil Capacity | 2.4 L (Change) / 2.7 L (Filter) / 3.4 L (Overhaul) |
| Tire Dimensions | F: 120/70 ZR 17 | R: 180/55 ZR 17 |
| Tire Pressure | F: 2.5 bar (36 psi) | R: 2.9 bar (42 psi) |
| Spark Plug | NGK CPR9EA-9 |
| Battery | YTZ10S |
Engineering Highlight: The RN43 generation marked a pivotal moment for the MT-09, introducing the ‘Twin-Eye’ LED face and, more importantly, the integration of a factory-fitted Quick Shift System (QSS) and an Assist & Slipper (A&S) clutch. These additions were specifically engineered to manage the aggressive back-torque of the CP3 crossplane engine, significantly increasing chassis stability during high-load downshifts.
Technical Deep Dive: The RN43 Evolution
The 2017–2020 Yamaha MT-09 (RN43) represents the refinement of the original ‘Hyper Naked’ concept. While the core 847cc triple-cylinder engine remained largely unchanged from the previous iteration, the RN43 brought essential EURO 4 compliance without sacrificing the 115 HP output. This was achieved through optimized ECU mapping and a revised exhaust system featuring a larger catalytic converter.
Chassis and Suspension Upgrades
One of the most significant technical improvements over its predecessor was the upgraded 41mm inverted front forks, which gained compression damping adjustment in the left tube, complementing the existing rebound adjustment in the right. This solved many of the ‘pogo-stick’ handling complaints associated with the earlier RN29 model.
Maintenance Guide & Essential Specs
To maintain the high-performance standards of the CP3 engine, adherence to specific fluid and component tolerances is mandatory.
Lubrication System
The MT-09 RN43 requires a high-quality semi-synthetic or full synthetic 10W-40 oil meeting JASO MA standards to ensure the wet clutch operates without slipping.
- Oil Change Only: 2.4 Liters
- With Filter Change: 2.7 Liters
- Engine Overhaul: 3.4 Liters
Ignition and Electrical
For optimal combustion efficiency and throttle response, the NGK CPR9EA-9 spark plugs should be inspected every 10,000 km. The electrical system is anchored by the YTZ10S battery, which provides the necessary cold cranking amps to fire the high-compression triple even in cold conditions.
Tires and Contact Patch
The RN43 is sensitive to tire pressure fluctuations. For street use, the factory recommends 2.5 bar (36 psi) in the front and 2.9 bar (42 psi) in the rear. These pressures are optimized for the 120/70 and 180/55 ZR17 profile, ensuring the bike maintains its characteristic agility while providing adequate heat dissipation on the highway.
Frequently Asked Questions
What is the recommended spark plug gap for the RN43?
The NGK CPR9EA-9 should be gapped between 0.8 and 0.9 mm for optimal spark delivery.
Does the 2017 MT-09 have traction control?
Yes, the RN43 features a 2-level Traction Control System (TCS) that can also be fully deactivated for track use.