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Sounds like a fuel issue. I agree with starting by changing the filters. If they are very dirty and the filter bowl shows signs of water, then changing the fuel is probably next. If the fuel is old and never had stabilizer added, that may do it. If this doesn't fix things, you might need to have the injectors rebuilt.
Yanmars are hard to start in cold weather since they don't have glow plugs, so that may not be part of the problem.
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