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After sitting for about a year, I fired up my OC-4 to plow some snow, and she started right up. However, after about five minutes, she lost a lot of power and started missing. I thought I had the magneto timed correctly, but I can't see why it would only happen once it gets warm.
I've got great compression all four cylinders, new plugs and wires, mag was rebuilt a few years back.
Maybe the timing mark on the flywheel is off a few degrees?
It sure seems to be a timing problem to me.
Any ideas?

I have a Terratrac 256 loader (same as Case 310) for which I'd dearly love to find a PTO and cover plate, as well as a 3pt hitch.
I know that Cletrac and Oliver used the same Clark Transmission/differential in their OC3 (maybe) and OC4 and OC46 (for sure). Since Terratracs are so rare, I'm thinking I'll ahve to scavenge one from an old oliver or cletrac crawler.
Anyone know where I might find one?
Thanks in advance