Posted by D Slater on April 03, 2009 at 07:48:40 from (71.164.43.225):
In Reply to: 362173r91 carb posted by karl f on April 02, 2009 at 22:48:18:
IH made enough changeover kits to change all tractors sold with R91 over to R92 in early 55 I think. All evidently didn't get changed because a new changeover kit shows up once in a while. Even if you have a R91 it should run and idle okay. Changes were in size of main seat or jet, discharge jet and a high speed ajusting screw and nut was added. Also a passage was pluged in bowl. Your carburetor has some change added. R 91 ones came with a plug were you have a high speed adjusting screw. The correct idle adjusting screw has a straight round section about 2/3 to half the thread size for a short distance on end then a taper to point. Main seat for a R92 carb has a .051 hole size. Main discharge jet has all three holes .055 size and tip size is .136 .
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