I have ridden with Franco who had a 235cc Finbro motor installed on his grom before his grom got stolen and here is a slight report on the performance with the engine using the Finbro ECM.I'm not even a costumer, and even I have had good experiences with HardRacing. They replied to me both on Youtube and on the forum.
(I'm based in Europe, and import tax from the USA is a dealbreaker, else I would be a costumer).
Soooooo, meanwhile I'm still waiting for a 235cc review video... None of the lucky people happen to own a GoPro?
Both Franco and I rode to San Francisco from San Jose/East Palo Alto which is about a 45-49 mile ride on the Freeway. Cruzing is about 65-70mph no problem with both groms of which mind's was the BrianS 170cc grom. Franco's just was cruzing along with zero issues and only change was a engine brace that was needed to cut down on the engine vibrations of the 235 motor. The only other problem with the 235cc engine is that you really do need a external oil cooler and that is where a Kitaco clutch side cover and takegawa HD oil pump comes into play. Other than that the 235cc engine is a solid engine to have just as long you can tame the heat and cooling of the motor.
I'm surprise there aren't reports on the reliability of the 235 engine grom owners in the USA or Hawaii.