Surging under load and not under load are two totally different situations. Sounds like it is when not under load which is not unheard of on an H. In fact, IH issued a surge button that can be added on problematic tractors. In fact, my 45 H has one. Dad bought the tractor new and I have no idea if it was on it when he got it or not but it has always had it as far as I can remember. IH always referred to it as hunting, rather than surgeing. Same thing. A new spring will not help unless your old spring is wrong one and is too heavy. The stronger the spring the more tendency to hunt if the hooking points of spring are the same. Some engines have different positions to hook a spring and that gives you some control over the hunting. Ideally, a very active governor will hunt once or twice when going from low idle to full throttle. That tells you it is very sensitive to change in load. If you have excessive hunting I would bet it is your linkage between governor and carburetor starting down inside governor. Just a slight bind or misalignment will set them off. If you have not checked the adjustment between governor vertical link and horizontal tube to carburetor I would do that. Pull pin, open throttle, pull up on lever going to carburetor so butterfly in carb is fully open and adjust link so pin just freely goes into clevis. Also, loosen the two screws securing tube at the governor so it can seek it's own alignment then retighten. Hunting under load is normally a fuel related issue.
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