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Bill: Holley carburetors are more sophisticated than MS carbs, and it is essential that they be rebuilt correctly to perform properly. I have learned through experience to not use aftermarket rebuild kits when rebuilding Holley carbs but, rather, bite the bullet for $80+ for the correct kit at CNH. There are many aftermarket kits for Holley carbs available that are absolutely trash, and cause more problems than they solve. Take both your tractor serial number and your carburetor number to CNH when you order your kit. There is more than one version of the Holley carb and installation of the wrong kit can cause problems like you describe. Unless you are experienced with Holley carbs you will likely not notice the differences in the parts. Once you have the correct kit, get the factory float setting from your CNH service manager or buy a Ford mamual. Holley carbs have a vacuum operated accelerator pump making them sensitive to float adjustment. Try to get the float adjustment within 1/32". I believe the factory specs are to 1/64" but that is a lot to ask. Make sure that the accellerator pump operates freely within its bore. Your engine will not run correctly if it does not. Finally, check the bores in the air horn casting where the float pin goes. It is common for the steel pin to wear the zinc diecast holes egg-shaped making proper float adjustment impossible. If yours is so worn, post back and I'll relate an easy and effective way to repair it. Dean
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