nfbr: If it has an auto choke you WONT have any manua control, it will either run off coolant temp OR off a heating element run off the alternator.
ANyway, pop the bonnet, take of thea ir filter aseembly and have a bloody look. Why is it so hard for people to spend a week on here asking about an engine that is rare as rare things and nobody knows anything abou the engine in particular.
If its carbed, you wont have an ECU, simple as that.
either have a look and find out or send me your eval palte details above your drivers side headlight, i will have a look then.