Re: Ford 641 zenith 13878

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Posted by K.LaRue-VA on June 12, 2019 at 08:43:03 [URL] [DELETE] :

In Reply to: Ford 641 zenith 13878 posted by Rob on June 10, 2019 at 15:37:32:

Tractor carbs usually had the main mixture adjustment so they could be adjusted for maximum efficiency under varying loads and conditions. Without the external adjustment the carb has to come apart to change the jet. I suspect most of these tractors are running just fine with whatever adjustment the main mixture got when the carb was last rebuilt. Being able to adjust for maximum efficiency is less important for tractors that just do occasional odd jobs. With the right jet, that carb will work just fine but you may have to crack it open again to put the "right" jet in it.

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