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I love my Super C. That said, I've got a few odd thoughts. One is that the size of your mower combined with the height/toughness of what you're cutting may be more than the governor can overcome. Try running at full throttle (which should give you the max 540 on the PTO at full load) but gearing it down and going slower. It that works, it will have been a matter of more load than the governor could overcome. You might also check out your fuel flow, from the top of the sediment bulb right through the float. Even with the governor working just as it should, if the fuel ain't there, the governor's ablity to do its job is limited. Don't forget the final screen in the elbow at the carb inlet. Another is that governors don't need major adjusting unless they've had parts replaced. Simply adjusting your governor's top speed up isn't going to fix it. She'll overrun with no load. If my first thought is right, tinkering with the governor won't help, as the restriction is coming from the strength of the engine not being enough to deal with the load of the tall grass. Adjustments for the usual wear in the governor are usually minor and are needed over a period of years. If there's any work to be done on the governor, it might be replacing the thrust bearing, but more likely the spring, which might have weakened over time. But, if the problem's come up suddenly, I wouldn't think that is your problem. Springs don't weaken that quickly, and a broken spring would have other very noticeable symptoms thay you don't mention. Keep in mind the HP you have available. Look at the Nebraska test for your tractor. Like any other tractor in the general size range of the SuperC, drawbar horsepower is about 10% less than PTO/belt horsepower. The latter figure, if I understand the Nebraska tests right, is what's available to run off the PTO or belt pulley with the tractor standing still. That 10% difference is the basic amount of power being used up just to move the tractor around. When in motion, the available power to the PTO is limited to the rated drawbar HP because you've added the load of the friction to move the tractor. That friction will be increased and the available power decreased by any further load, such as the weight or drag of an implement) that will increase friction. For the SuperC, to round up, the numbers were 22hp at the drawbar and 25 on the PTO. If the tractor is moving, the most you can get anywhere, including the PTO, is 22hp. Add 400# for a mounted mower, or more to allow for the drag of a pull-behind, and the available hp could drop to 20 or less. Bottom line, were it mine, and barring a sudden change in the way your setup has worked for you in the past, I'd first look at making sure my fuel-delivery system is in good shape and slowing down to make better/most efficient use of my power. Apologies for my long-windedness. She's tall like an H, but she's runnin' on a 123.
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