hi the lack of throttle control is probably the sleeve around govenor spring stuck in its bore, remove the side plate behind mag and you will see the throttle shaft with spring on right hand side. you may be able to free the sleeve from here but will probably have to remove the radiator and gov cover to tap it in and out. overheating open rad cap with engine running and check for cirulation you should see water flowing from top hose and down into core, is no or low flow remove top tank from rad. i know core is new but when engine is started rust flakes are pumped out of block and block top of core. if this is clear and it has not had a later thermosat added the problem may be the water space in the block fill of rust the only real why to clean out fully is to pull the liners, i Know people who have had success with a lye solution the process is fill rad with solution run till boiling drain and flush repeat as neccessary at your own risc...
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