As there's a couple of threads on this topic running simultaneously I create this in an effort to contain all relevant info. I have previously posted my efforts to obtain a 2019 ECU for my 2018 'J' model SP2. I was advised by Honda UKs 'technical department' that the new ECU is not backward compatible. (Nothing new to @RC45 and @nevsrevs ) This morning I visited my dealer to enquire about purchasing an HRC ECU and loom if necessary because I want to change my gearing and tyres. I was shown the ECU on the exploded parts schematic and realised it as the 'standard' ECU with a price tag of some £1806. The parts 'manager' had no access to the HRC manual (that I knew of courtesy of RC45) and was no real help in trying to service a customer who has purchased 3 bikes from said dealer including the SP2. I advised I will return tomorrow (Tues) and see the head tech who DOES know his stuff (as far as street machines). I will attempt to l;earn of any software 'tweaks' that might be able to be applied to accommodate tyre/gearing changes, or if that's not possible what sort of rate I can get for the appropriate HRC ECU or reflash so that I may use my bike for its intended purpose.