May have a problem. The 361525R1 carburetors were not out to long before IH decided to change them to R92 specs. There was supposed to be enough change over kits sent to dealers to change all tractors sold with R91 carburetors to R92 sizes. Guess all didn't get changed though as once in a while a original R91 showes up. R91 carbs didn't use a high speed adjusting screw originaly, a special plug screwed in where the packing nut goes. Jet was supposed to be sized to work with no adjustment. Carburetor change over kits changed the jet and other mettering parts and added the highspeed adjusting screw. Don't have a original R91 carb to check at this time but I wrote the jet size as .051 for R91. R92 size as .048. Hope this doesn't confuse more than help. found some NOS carburetor change over kits for 400 tractors. Never found any for the 300. Think 300 kits did have a passage plug though, so maybe its changed and not marked.
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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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