Thanks Matt for the information and with something substantial to back it up.Interesting stuff from Castrol Tech in BKK in that A747,although a 'Dinosaur' still outperforms new formulas.
I ll get in touch with Dirt Bike and order up the XR77.Using pre mix.
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My Bikes;
TZ250K
TZR250 3XV Sugo kitted track
TZR250 3XV modified road
NSR250R MC21 Rothmans
NSR250R MC18 Modified road
NS400R
Dio 80cc big bore with 26mm flatslide (wicked)
900RR Fireblade