I agree, this is indeed a good thread in which I as a sparky have participated in and enjoyed.
I'm with you in that if the tractor especially ignition and carb are correct she can start fine even at 6 volts even at slow and/or hand cranking speeds. Similar to what you report, when hand starting my mag equipped JD B its starts as well or maybe better when cold then warm wooooooooooo hoooooooooooooo lol.
HOWEVER you/we have an advanatge (in cold temps) using a Mag versus a 6 volt coil ignition system because the mag creates its own energy versus if its a battery powered 6 volt system with an elec start where cold cranking reallyyyyyyyyyyy drops battery voltage drastically to such a point theres a weak spark !!!!!!! On that mag theres no such problem. IE with a mag the temperature isnt such a factor as it is with a 6 volt electric start battery powered coil ignition system where cranking lowers battery voltage and reduces spark energy
Next you ask:
"With all that said, I challenge everyone to explain to me, that if your ignition is well tuned, why you have to spin an F series or Letter series tractor fast?"
Im NOT saying you have to spin it fast, YOU INDEED DO NOT, my B hand crank starts at extremeeeeeeee slowwwwwwwwww cranking, I barely pull the flywheel over and she fires right off. But that being said, the answer (in theory at least) to your question isnt rocket science and is simple.........If shes cranking faster theres less time for compression PSI to leak off so when the spark does occur at TDC its at a higher PSI compression. SURE it dont take high PSI to start it, the JD even uses compression release petcocks for hand starting, IM JUST POINTING OUT TO ANSWER YOUR QUESTION A REASON WHY THE FASTER SHE CRANKS THE HIGHER THE PSI IN THE CYLINDER WHEN SHE FIRES.... But NO she dont "have to" crank fast to start well as we both report ESPECIALLY with a Magneto, Im just saying if she spinds faster theres probably more compression left over (less time to leak off) when the spark finally happens...........
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