Bottom row, the 49 on the left, Timber Bear 849 in the middle, and the Craftsman on the right.
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The 46 will get the treatment today.
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While all of these saws are basically identical, no two have been put together exactly the same and even the fasteners are varied. On the 42, 46, and 49 some of the fasteners require a T20 driver, where all of the fasteners on the Timber Bear 849 and Craftsman were T25. I don't even know where you'd look to find the same screw (diameter, pitch, head type) but different drivers...
There were also differences in the routing of the fuel lines, way the wires were attached, and the way the carburetors were mounted. The Craftsman and Timber Bear 849 had an extra support under the carburetor and used gaskets, the 46 and 49 have no supports and just rely on the rubber boot for sealing.
All but the Craftsman used really poor tubing for the fuel, oil, and impulse lines.
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All of the Oregon test saws that I've been through so far have an extra hole drilled in the air filter cover, really makes me wonder what that was about?
Mark