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wristpinThat’s how I would expect it to be as the “second shaft” would have been removed when the engine was specified for cable operation. Your “ pre loaded” spring is the governor spring which deals with variation of power demand while the machine is working . Just set the tension on that spring to give 3000 rpm at full no load throttle. In use the governor will look after variations in power demanded by changes in soil conditions while working. Always assuming that the internal governor mechanism is working .
Before jumping out of the fat into the fire with an engine swap, perhaps you should seek some local assistance from someone familiar with small horticultural engines. It could well be that what you see as a problem is quite normal for an unfamiliar setup. There may well be a VHGMC member in your locality who will assist you.
