I've got two big backhoe loaders with 3-53s. Both skip, sputter, and smoke when started at 50F - but clear up when warm.
Your problem sounds usual. If you get grey/white smoke when the engine is warm - and it runs smooth with no skipping- I'd suspect you're burning coolant. If so, I suspect you'll eventually notice the radiator doing down.
That being said - standard advice for any 2-stroke-cycle Jimmy that has valves (some don't) - adjust the rack. If the rack out, so is injection timing and fuel delivery.
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