More information on Castrol TTS at http://www.castrol.com/liveassets/bp.../TTS_B1517.pdf.

Product Application
Castrol TTS provides excellent lubrication for most competition, street
and off-road motorcycles and is our prime recommendation whenever
a higher level of engine protection is required. It may also be used in
Go-Kart racing engines, or wherever Castrol Activ 2T is recommended.
Castrol TTS is particularly recommended for trail bike riding due to its
low exhaust smoke characteristics.
Note: Castrol TTS is not suitable for use with methanol (alcohol) base
fuels. Castrol M is recommended in these applications (see Product &
Technical Data Sheet B861/91/1).
Castrol TTS is soluble in “Kero-Ether” fuel blends used in many model
engines as long as no alcohol is added.
For highly stressed competition engines, Castrol R2 Racingbike is the
prime recommendation. For competition applications, particularly for
very high engine speeds (typically greater than 14,000 rpm), Castrol
A747 is the prime recommendation (see Product & Technical Data
Sheet B1109/95/1).