Aprilia Tuono 660 (MY2021) vs Yamaha MT-07 (RM04)

Tuono 660

What owners say

Strengths

• Light, agile handling
• Refined 270° parallel-twin character

Trade-offs

• Buzzy vibrations around 5,000–6,000 rpm
• Soft, underdamped stock suspension (Standard model)
• Parts availability and dealer density

MT-07

Strengths

• Easy To Trust Quickly
• Cheap To Run
• Light, Friendly Controls
• Addictive CP2 engine character
• Accessible for all skill levels

Trade-offs

• Idle And Decel Cutouts
• Fragile 5th Gear
• Quick To Corrode
• Budget build quality
• Jerky throttle response at low RPM

Tuono 660

• Loose shift lever (early units) and quickshifter false-neutral / "sticky" engagement Two distinct symptoms reported: (a) on early MY2021 units, the shift lever could come loose from the splined shaft within the first ~100 miles and require dealer replacement; (b) the bidirectional quickshifter occasionally produces a false-neutral on upshifts in upper gears at low or partial throttle, or "sticky" cuts during shifts. Rough gear changes at low rpm and partial throttle, smoothing above 5,000 rpm, have also been reported. The loose-lever issue is widely reported on MY2021 and largely resolved on MY2022+ production.
• Snatchy ride-by-wire fueling on throttle transitions Closed-throttle to roll-on transitions exhibit a touchy, jerky character widely reported in launch-year reviews. Cold-weather behavior below approximately 54°F (12 °C) ambient adds occasional hesitation or misfires until the engine warms. The character is most pronounced in the more aggressive ride modes. Reports diminish in MY2022+ coverage relative to MY2021.
• Water-pump mechanical seal weep at low mileage Coolant or engine oil drip from the water-pump weep hole, sometimes presenting as early as 150–250 miles. Recurring early-ownership theme on Aprilia owner forums. The coolant-side variant sometimes self-clears as the seal beds in; the oil-side variant requires teardown of the flywheel cover and seal replacement, normally completed under warranty.
• Aprilia MIA module pairing failures and dashboard firmware quirks When the optional Aprilia MIA Multimedia Platform (PMP 3.0) module is fitted, owners report Bluetooth pairing failures, the phone icon remaining greyed out, inaccessible submenus, and music interruption when paired comms are active. Several owners report a fix only after a dealer-side dashboard firmware update via the Piaggio PADS diagnostic tool.
• Cosmetic finish and fastener corrosion complaints Recurring small complaints across reviews and forums: matte/satin tank paint is thin and scratch-prone; visible fasteners surface-corrode in year-round use; belly-pan plastic feels rough relative to price tier; decals work loose over time; minor rear-brake squeak reported. None are structural problems and all are cosmetic in nature, but they are widely cited as detracting from the bike's premium positioning.

MT-07

• Intermittent engine cutout at idle and during deceleration The engine cuts out intermittently, especially when idling at traffic lights or decelerating to a stop. The ECU appears to reduce fuel supply too aggressively at idle. Problem worsens in hot weather. Stalling during downshifting is particularly hazardous. Multiple NHTSA consumer complaints filed. Reportedly improved with ECU mapping adjustments in later production.
• Battery loses charge during extended standstill Battery depletes when the bike sits for extended periods. Components draw power even when ignition is off. On models with parking light position, the ignition switch can cause parasitic draw if moisture enters. Some owners report charging system issues linked to the regulator/rectifier.
• Instrument cluster LCD flickers, goes blank, or shows partial information LCD display develops flickering, blank sections, or complete failure. Causes include loose internal ribbon cable, water ingress, or corroded connector pins. Aftermarket replacement LCD modules available (same part 2014–2020 compatible).
• Pronounced clutch rattle at idle; potential inner plate failure Pronounced rattling noise from the clutch at idle in neutral. Noise disappears when clutch lever is pulled in. In severe cases, inner clutch plates can break or shatter. Contributing factor may be worn clutch basket. More pronounced on cold starts.
• Gear indicator fails to display correct gear (especially 5th/6th) The gear indicator in the LCD display fails to show the correct gear, particularly in 5th and 6th gear. The number flashes, disappears, or displays incorrect values. Root cause: dirty contacts on the gear position sensor. Cleaning is a temporary fix; sensor replacement (~40 USD) is the permanent solution. Yamaha developed a revised sensor.
• Poor surface finishes on fasteners and coolant pipes Widespread corrosion across peripheral components: radiator coolant pipes (chrome with thin lacquer, deteriorates rapidly from road spray), allen key bolt heads, brake line fittings, disc bobbins, gear lever linkage, rear sprocket, suspension linkage fasteners, and seat lock (seizes). Screw heads across the frame show rust. Weld slag not properly cleaned on some frames.
• Side stand safety switch causes unexpected engine cutout The bike starts normally in neutral but dies immediately when shifted into gear. Caused by the kickstand safety switch failing, corroding, or the starter cutoff relay malfunctioning. The switch connector is vulnerable to moisture ingress.
• Surface rust on steel swingarm The steel swingarm develops surface rust, particularly underneath the chain guard and near chain adjusters. Rust can appear within months of purchase, even without winter riding. The paint/coating is thin and easily damaged by chain debris. Weld seams and areas under the chain slider are most affected. Yamaha has replaced some swingarms under warranty.