

This edition of the Yamaha XT 660 X is the 5 speed | Manual version and was first brought out in 2011. This was at around the same time as the introduction of the 2012 Buell-EBR 1190RS V-Twin and the 2012 Kawasaki ZX-10 R Ninja Emerson Fittipaldi Limited Editi.This particular Yamaha XT 660 has a 659cc Liquid cooled, Two stroke, V8 Petrol powerplant with 1 cylinders and Electronic Fuel Injection.
An alternative V8 engine, Supermoto style motorbike includes the Norton C 652 SM International - [1999]
The 2011 XT 660 shares its V8 engine and Supermoto style configuration with the likes of the 1999 Norton C 652 SM International and the 2019 Suzuki DR-Z 400 SM. Alternatively, if you're looking for other bikes which share the XT 660's Supermoto style with a similar size of engine then how about the 1999 Norton C 652 SM International | 1999cc.2019 Suzuki DR-Z 400 SM | 2019cc.
Weighing in at 186 kgs (410 lbs) this makes the Yamaha XT 660 X in the same weight category as the 2025 Kawasaki Z 900 DOHC SE or the 2025 Kawasaki Z 900 DOHC, give or take 50kg.
In terms of power the 659cc 4 valve V8 1 cylinder engine produces 48 bhp (35 kW) @ 6000 rpm similar to the 2025 Honda X-ADV 745 [57.8 bhp (43 kW) @ 6750 rpm] or the 2025 Yamaha T�n�r� 700 [72.4 bhp (53 kW) @ 9000 rpm].
The SOHC Two stroke unit throws out torque of 43.0 lb-ft (58.3 Nm) @ 5250 rpm placing it alongside motorbikes of similar performance figures such as the 2025 Honda X-ADV 745 [50.9 lb-ft (69.0 Nm) @ 4750 rpm] and the 2025 Suzuki SV 650 ABS [47.2 lb-ft (63.9 Nm) @ 8100 rpm].
If one combines the weight with power or torque performance for the Yamaha XT 660 you can get a better idea of it's real world performance.
The 2011 Yamaha XT 660 X has a Power to weight ratio of 258.0 bhp per ton and 231.5 lb-ft per ton. Bhp Per Ton figures of the 2011 XT 660 competing with the 1980 Honda GL 1100 Gold Wing [282.2 bhp\ton] and the 1980 Honda CB 750 Custom [282.0 bhp\ton].
If you agree with the late great Carroll Shelby, then arguably an even better indicator of potential performance is Torque. Factor weight into the equation and you end up with - Torque per ton, with the Yamaha XT 660 generating around 231.5 lb-ft per ton. If you're curious as to what other motorbikes have as much torque to weight then look no further than the 1999 Kawasaki VN 1500 Vulcan Drifter [256.5 lb-ft per ton] and the 2002 Kawasaki VN 1500 Vulcan Drifter [256.5 lb-ft per ton].
With a 0-60mph time of 14.3 secs or a 0-100km/h (0-62mph) of 14.6 secs, this makes the Yamaha XT 660 X similar in acceleration to the 2021 Honda NC 750 X DCT (14.3 secs) and the 2014 Yamaha XT 660 X (14.3 secs). This Yamaha XT 660 X also competes in terms of 0-60 mph and 0-100km/h with the 2018 Honda CB 250 R Neo Sports Cafe (0.0 secs) and the 2020 Norton Superlight SS (0.4 secs).
Quarter Mile time is a close race between the 2011 Yamaha XT 660 X and the 1998 Yamaha XV 535 Virago DX
When talking about the performance of the 2011 Yamaha XT 660 X on the drag strip it can reach a quarter mile in an estimated 14.2 secs @ 0 mph. Bikes with a similar performance down the quarter mile can be found in the 1998 Yamaha XV 535 Virago DX (14.2 secs) and the 2008 Yamaha XT 660 R (14.2 secs).
The 2011 version of the Yamaha XT 660 X has a maximum speed of 102mph.
If maxing out your bike on the AutoBahn is your thing and you're wondering what's faster at the top end than the 2011 Yamaha XT 660 X then how about a 2019 Kawasaki Z 300 Twin Cylinder (113 mph) and the 2017 Kawasaki Z 300 Twin Cylinder (113 mph).