Posted by D Slater on April 03, 2009 at 12:11:15 from (72.65.152.236):
In Reply to: Re: 362173r91 carb posted by karl f on April 03, 2009 at 09:21:02:
Idle air screw end has very little area before taper starts then a long taper, around 3/8 inch long from threads to end of taper. You probably have the right one, I think the ones with idle air adjusting screw lower on carb have a bigger thread. In the earlier post I mentioned 2 holes in throat above venturi area for a R92. Since you have a R91 you have another hole. If your carb was changed sometime to a R92, and if you look at the 2 holes in throttle body that match the idle jet and air bleed there is two holes to one side of those holes and one on other side. If it was changed the hole close to the 2 middle holes on side with 2 holes will have the passage plugged. Change over kits had a new ID tag that was supposed to be installed on carburetors when changed. My experientce on working tractors is the R91 had more zip in some RPM ranges than a R92 and the R92 was better in other RPM conditions. One IH bulliten indicated the changes to R92 were made to try and help fuel use. Although Parts books don"t show it I"m pretty sure a R93 was sold sometime, but never had one apart.
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