For the presentation of the new SIRIO S12TRP EVO2 go to the following web page http://www205.pair.com/kyosho1/kweb/ (it is Kyosho France) under Moteurs, it is a comparison with the old engine, it is in French but following is the translation to English.

"This new engine is in conformity with the 2004 regulations It is an evolution of the Sirio 12 TRP which was the first production Sirio . Having used the old 12TRP, I will benefit from it, to compare the 2 engines and to see thus what evolved. With the first glance, what one notices is the cylinder head which is larger, of blue color and the Sirio initials are engraved above with the name of the engine EVO 2. The carburetor is not any more with 2 adjustment needles as on the last TRP but with 3 adjustment needles. It is new and resembles much the one equipping the .21 Sirio Kanaï. Much more material around recovery screw (mid range needle), it is in this place that Sirio had problems with sealing in the past. Still a common point with the Kanaï, the casing evolves and integrates now an “O” ring to improve the sealing with the carburetor, moreover the mating plane is more significant. That should ensure a perfect sealing. The casing is equipped with new high speed bearings, which is too often neglected in this category of engine. The front bearing is a new more resistant model. As his big brother.21, the casing of the .12 is worked from origin with cuts at the bottom of the boost transfer and at the top of the exhaust transfer. The crankshaft has now more work in observance of the new regulations. The skirt is worked with beveled cuts on the side transfers .The exhaust transfer is modified at the top sides to match the cuts on the casing. The piston is machined and not molded. That ensures much better thermal and mechanical qualities. The rod is of the knife type with a central groove and 2 bronze rings equipped with holes for lubrication. The back plate is equipped with 2 "ears" in order to aid the side transfers. The S12 TRP EVO 2 is delivered from origin with a turbo insert. This insert is very thick and deeply fits in to the cylinder head in order to support heat exchange and to thus ensure an optimum cooling. The engine has 1.5 hp and 41,000 rpm, with a more progressive power band."

Now I guess it all depends on the different markets, I got mine in Spain and the side sticker on the box said S12-TRP “evo 2” Sirio engine 2.1cc 3 ports ABC- SG shaft Slide Carburettor, and It came with the old small black head and turbo button. The rest of the engine is exact to what is said on the French Kyosho article. with the new carb, the new bearings, the case o-ring, etc.etc.

Hope this helps
AFM