Onan engine parts, where to find them

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The onan engine in my hobart champion 16 has developed a rod knock. I'm having trouble finding parts for it. Anyone know places to find parts or even replacement engines to get this up and working again?

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The hobart does ac/dc and cc/cv. I wired in the miller 14 pin plug and setup a contactor so I can hookup anything that uses the 14 pin and run it like a normal power source. I just need to modify my miller foot pedal to 'talk' to the hobart correctly to have proper amperage control. The 251 works great,...

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The pedal goes to the 251 then from that to the shop master, so I have full control of amperage. The shop master, when it has enough power supplied to it, has more output capability then the hobart does. 300 amps vs 210 dc, 225 ac on the hobart. On cv the shop master does 26-28 volts i think vs the...