I could be wrong here, but on some (most? all?) Masseys with the CAV injector, there is a spring and lever under the top cover of the injector pump. The lever has holes along it's length to adjust for pump response for various engine sizes, and if the cover was taken off to replace the throttle and fuel shutoff rod O rings, it's possible that the spring didn't get put in the right hole on reassembly, which could cause the problems you are describing.
No, I don't know what hole is the right one for your engine, but I'm quite sure if you ask on the Massey forum, someone there would know.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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