Chinewalker, + 2, technically explained.
Today was CRC decarbon time. Firstly decarboned both plugs to near new cond, then gapped both to specs
Warmed OB for 5 minutes. While geared, throttled to 2000-2500 rpm range, sprayed several shots of CRC Engine Tune-UP through carb's throat, let it smoke for some time till product cleared off, did same procedure 5 times in a row. Went for a morning wot spin on flat calm water cond, this is what happened.
Day before application, OB achieved with one up and lightly loaded 36 Km/H, after application 38 Km/H on a straight 1/4 mile water course run with GPS. Bear in mind that my boating is done at 4700-5500 rpm range from max 5900 rpm range, so one would assume that my OB runs carbon free inside, which is no, have dismantled it twice and know what's going on inside, LOl!!
On 2 strokes OB's. this product will not remove severe carbon build-ups, which must be removed mechanically stripping cylinder head & exhaust cover down, but will restore proven lost agility wonderfully. A must try.
Happy Boating