Question: is a ttr 90 a 4 stroke?
Answer: The Yamaha TT-R 90 E was a single cylinder, four-stroke Trial motorcycle produced by Yamaha between 2002 and 2007. Max torque was 4.5 ft/lbs (6.1 Nm) @ 4000 RPM. Claimed horsepower was 5.36 HP (4.0 KW) @ 7000 RPM. It came in both a kick start only and an electric start version.