El Toro has a good point, I would do a bit of experimentation first. Step one, Check manifold tightness and leaks with propane (see Search For box to access archives). The manifold can also have an internal leak from exhaust to intake! If it is all tight and leak free: Richen the idle screw when it is beginning its warmup. (also the load screw) At idle, it should be set for best idle. When at high Idle, the load screw (lower larger) should be turned out until carbony black smoke appears, then turned in for clearing up the smoke. Running with a load will allow the best adjustment of the load screw, do it in 1/2 turn increments to get best power. W/O smoke. If the tractor is not using oil, it may not need a rebuild. If it has not been run hard, or had its valves adjusted, do the valve adjustment, then run it hard. JimN
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Today's Featured Article - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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