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Your information is greatly appreciated Mike. How did you identify it as a Comet 780? I have been looking at various configurations and was hovering on the possibility of it being a 910. I couldn't find any ID marks on it but it is near impossible to get a good look at as the muffler is over top of it. It has 6 vent holes in it and other than the hub bolt it appears to have 3 bolts holding the dish like cover on it. The machine's 600 hours has been relatively light usage though 200 of those hours, maybe 300 would be rubber track usage in snow which is tasking. I am going to install a new belt on it and adjust slack to spec and will use some dry graphite if I can find any. Can I spray that in the vent holes when stationary? I give it a good spray of Deep Creep (penetrating type stuff and let it drip dry.). I am familiar with a fair amount of wrenching but centrifigal clutches are out of my league. So is a T20 for sure as well.
Mike, I have been looking at clutch illustrations and aftermarket vendors, it does indeed appear to be a 780 (1" shaft, 1/4" keyway). I see they are available and pretty reasonable. With Max these days, finding the part is the victory.