those pony engines can be a real headache but they sure do sound good when they are running right. we finally completely remanned ours in a D7 17A, bores were egg shaped. I had replaced carburetor with new four years ago due to vacuum leaks past the throttle linkage. new carburetor from Cat then was $350 but we were using the tractor winching in the oil patch so it needed to go. later on we rebuilt the mag, Cat wanted $900 for a new one, local dealer threw all his parts away, short line parts store wanted $450 for a new mag [Wico], had no parts to offer. That is when I discovered Chicago Magneto. also learned from an old mechanic that setting the points at exactly .012 produced a much hotter spark. setting the good set of points at that gap made a great improvement in the rpm range between starting and full load. The next great improvement was boring the egg out and installing the proper size pistons. I have had this tractor since 1976 and its never ran this good since we owned it. hour meter showed 5600 hours when we bought it [not right amount], but it has 17,500 now which is the right amount since 5600.

Thanks Everyone We Sent The Mag And Carb Back To The Rebuilder For Him To Recheck Them So As Soon As I Get Them Back And Install Them I Will Keep Everyone Updated On The Results . I Still Have A Strong Feeling It Is The Mag . Thanks Again Dan

We Got The Mag And Carb Back Installed Both And She Started In The First Couple Of Turns And Ran Fine Everything From Idel To Fullthrottel. Cranked Up The Diesel And She Also Ran Like A Champ Thanks Again For The Help Now On To That 933 Loader Will Probebly Need Help On That . Dan