Posted by B-maniac on December 05, 2012 at 17:15:16 from (18.104.22.168):
In Reply to: dltx10 problems posted by Ryaninks on December 04, 2012 at 17:19:28:
You have systematically ruled out everything accept possibly the two things that will cause a rough run/ cough. Ever notice if you choke a warmed up engine that it will not "cough"?? It will slowly just die from flooding. BUT... if you run an engine too lean it will backfire / cough and run rough. So what all would cause a lean condition that you havn't allready checked? We are assuming you tried choking it a little when throttling up to see if it made it better or no change. Check for air leaks at all intake tract mating surfaces. What kind of intake manifold does it have? Some of the "all fuel " ones have the intake runner going through and cast right into the same casting as the exhaust so there is a remote possibility that a crack inside could let intake pull diluted exhaust air just as an outside gasket leak would. Just thinking out loud here. You are either leaking air or starving for fuel...lean!Another thing that will cause your problem is a flake of rust in the small orfice on the top of sediment bulb protruding into bottom of tank. You can have a perfect carb job and float level will show correct at idle but will still lean out when throttle is opened up and I know from personal ex that it will make it cough and pop and sometimes even intermittantly. I would say a weak/junk condenser will do same but you said you eliminated that with diff mag that I assume worked good on donor tractor. Let us know what you find.
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