David: My dealer sold two of those new, and said no more, it's either diesel or no 504. I bought mine with a farm, (one of the two) it was 5 years old, 1,500 hours and a new engine rebuild only because the farmer who traded a 300 on it was never satisfied with the 504. When he sold it to me it was at the dealer having that rebuild. When it came home he wanted to run it, just to see if they improved it. After 50 hours on a 9' haybine, he advised me not to keep it any longer than necessary. After the 50 hours it was acting just like yours, and he said it had done that ever since new. If you have time for a tune up per month, fine, I don't. If you look at the engine specs, no way it can match a 300. Less cubic inches and more RPM's have never proved themselves, and every company tried it. All you've got is a reamed out Super A engine. I've heard countless stories about 504 gassers most of them no better. The diesels truly had 45 hp. I've been in this game too long to believe anyone is getting 45 hp from a 504 gasser. 16 new or near new Farmalls came to our farm and the only disappointment was the 504.
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