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John: Not sure I can help, but here are a few thoughts.
I think your 820 is rated at 1125, and the fast idle should exceed 1250 rpm. Let me think this through out loud as I look at the parts book. The throttle is linked via a rod and adjustable clevis to a cross shaft. The cross shaft terminates with a speed control rod. I take it this is connected to the governor. You could disconnect that rod and try to pull it away from the governor by hand. If that works, you might just have to adjust the clevis on the other side to get more throw.
After that it is probably a rack adjustment. The Welsh plug is just a tin cap (similar to a knockout in an electrical outlet box). It is convex with a sharp edge, so when you tap in the center it gains circumference, and it locks in place. You can proibably remove it with a small chisel, or drill (carefully) a small hole, insert a sheet metal screw and pry it off. Nes ones are available, so don't try to dsave it. Most are missing from previous adjustments anyway. As I recall, turning the screw in increases the rack setting. Make this adjustment with the engine warm.
>>Question #1 - Would the former owner have set the rpm down to hide a problem with the engine?
I don't think so, but who knows ? They run pretty smooth at 1,000 and start to sound antsy at 1150. I always thought they sounded almost out of control at 1250, but that's just me. I would think if it sounds good at 1,000, it will sound ok at 1250.
>>#2 - If I wanted to increase the rpm to factory would I look at setting the racks back up or adjusting on the governor?
I think you adjust that on the racks. I don't kjnow the setting for an 820. Someone else will have to provide that. >>#3 - How do you get thoes "Welsh" caps out to adjust the racks and gov.? See above. >>I would be greatfull for any help as I want to work the tractor durring harvest very soon. That's half the fun of owning one of these things! - John
Amen !
Frank
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