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I am lost on this one. I have a Gravely with the FS691 engine. After running for anywhere from 10 minutes to say 30 minutes the engine starts to surge or stutter. If i put on full choke it is better for a short time but eventually I need to limp back to the garage. I have changed the plugs...

Just got my first zero turn. Can somebody explain why most brands (that I know of ) instruct to engage and disengage PTO at 1/2 or greater throttle? Logic tells me to engage at idle and slowly increase RPM to minimize shock to the drive train. I would think engaging at a high RPM would be a...

Well i just bought a new Gravely Proturn 52. I think i did well for $5,600. I got a quick lesson from the delivery person and his advice conflicts with the manual. He says full throttle to engage and disengage the PTO. The manual says 3/4 throttle to engage and does not mention setting to...