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My father in law cuts timber. He has a jonsered 2172 and he cut full time with it for a little over 3 years. That felling and bucking plus cutting firewood. It was starting to get weak so I put a new top on it and he is still using it. Its absolutely amazing how these little engines hold up the cold and hot weather. A key to make it last is using good gas, good oil and keeping the air filter clean.
And keep the saw clean. Clean metal dissipates heat well. If the engine is packed with oil, grease, wood chips, dirt, etc. then the saw can experience detrimental heat and slowly destroy itself.