Just purchased a 04 Bobcat S185 because it was a great deal but have a few issues to take care of. When I purchased the machine the primer bulb was broke, I think it got pinched in the door and the plastic end was broke off going into the bulb. I got a new primer bulb and when I pump it up it never gets rock hard, you can just keep pumping and pumping. The machine starts great, it has keyless start, just touch the button and it fires right up. The machines runs great otherwise. Trying to figure out why it blows out black puff of smoke every time I increase the throttle, there is also a just a little white smoke all the time. I changed the fuel and air filters when I purchased the machine. I'm thinking fuel injectors? Should the primer bullb get hard (pressurized) or does this have nothing to do with the smoke. Thanks