[AT] 430V Update

[Spencer Yost]

Good news on the carb rebuild.  i got a test fire today.  The rebuild eliminated my high-throttle hunt.   It also eliminated what I considered to be some excess black smoke. Obviously I can't be entirely sure as to the culprit, but I believe it to be the high-speed needle. The housing was cracked and the packing was shot.   Based on the smoke I think it could gulp air causing the hunt, but otherwise run rich.

However my inability to accurately and consistently adjust the throttle mixture remains.  That's when I noticed I still have free play in the throttle adjusting needle(I can wiggle it), even with a new needle and spring. Apparently the threads in the carb are worn.   It isn't especially problematic, as I can get it sort of close. But I still am not happy with it. Also the reverse mounting used on these John Deere's 430 carburetors causes the idle speed adjustment screw to land on a boss on the carb it is not intended to.  That idle speed screw tends to be real touchy because of this. Less than 1/8 of a turn and your running 1500 RPM instead of the spec.

But boy it sure is nice to listen to that thing lug under full throttle. It sounds real sweet now.   I have a touch of a high speed ignition miss right now.    But I think that is timing.   Previously, because I could not get it to run consistently at high-speed I could not time it. These tractors, as I think Cecil reminded me,  earlier, are timed under full  rpm.

So still some tinkering. But right now it is running much better - even to the point the causal observer would think its running great.

Next:  I have the rotted seat back off, and will be reupholstering it. I think I can use the original material.  I am also going to have to swap out the  rear rim that is rusted. I found a great  original and correct rim last summer. I just need to get it down to the tire shop to swap it.   Amazingly it leaks air very slowly. So it was a low priority.

Spencer Yost