Ian
Don’t know about reduced power on early ETZ’s but they were offered with the option of drum front brake and premix ie no oil pump. I think this was to reduce the price differential between the ETZ and the TS for buyers, maybe to appease the likes of Wilf, but perhaps there wasn’t sufficient sales to encourage then to continue. I believe that the early disk brakes were imported Brembo, rather than the licenced copy they used later and the oil pump was from Mikuni in Japan so it could of just been economic/currency difficulties with importing stuff.
Oh I forgot to mention the 12V electrics on the ETZ changes/improvements.
Brian