I am aware of the Robin 22cc engine as they were some of the first engines used by FG Modellsport in their very early 1/5 circuit cars and their 1/6 off-road Marder.
I am not aware of any Kyosho models at this scale though, a photo may give a clue as to what it actually is though.
The Robin engines were not particularly powerful at around 1bhp, if you were lucky and were soon superseded by the Zenoah range of 23, 26, 29 and 32cc along with the many copy variants now available, these are now delivering serious horsepower at around 3bhp upwards in standard form with a tuned pipe but when race tuned are simply awesome at around 7bhp!
As for what is available now then there is a huge range of models from FG, HPI, Maverick, Carson and others as well as very specialised all alloy cars from the likes of FG, Contrast, Harm, Hormann, Mechatech etc!
What I can say though they are great fun to drive and race, my latest acquisition is an FG 4WD Mini which for a 26cc in standard tuned pipe trim kicks out over 5bhp and is for limited class BRCA racing.
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