This Uma M5 is Benelli RFS base data, the problem is temperature sensor signal is totally different from Brixton, therefore you can't run it properly. We tried but can't work for daily drive, once the engine cool down it very rich (due to different temperature sensor voltage)
Regarding Cylinder, i have gone through mostly many Cylinder (LONCIN, HONDA) but then the best fit would be Wonjan, so please don't spend your money on those aliexpress if you are not so sure.
Regarding original ecu, 70% time it run at close loop, it only go to open loop if your TPS more than 90% or you do a blipping throttle 2 times (in 1s), i will got to open loop table for 3-5s then go back to close loop.
Aracer is fully adjustable including Fuel base (for upgrading injector / bore kit), Fuel table (for camshaft), AFR table, Fuel acceleration, Fuel Cut, Spark advance, Idle speed, Idle limit, you can save and load many Maps, Back fire As you want, you can upgrade this with Auto tuning module wideband o2(it will use AFR table to get the best at any point), quick shift. So basically you can do mostly everything with it. The original data comes with it already Dyno on Brixton bikes.
Regarding the camshaft, as you know to keep the bike Euro4, it has to open late, close early so all the fuel burn. therefor as high rpm, you will feel the bike very heavy and pickup slowly. By alter the open and close time longer, it help more mixture in and out. result for mid high and high rpm HP. You can see the picture of dyno for yourself.
[USER = 2605] @Brixton RS [/ USER]: do you have pictures of the conversion yourself?
Which pinion did you adjust (on the rear wheel or engine) and to how many teeth?
If someone is interested in a Dyno run:
[MEDIA = youtube] w7pAEgzQHgE [/ MEDIA]
Is the 150ccm variant.
With modified exhaust and original ECU: 11.77 HP
With modified exhaust and adapted ECU: 12.05 HP