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1959 Johnson FD13 spits and spudders while idleing... why?
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<blockquote data-quote="Pappy" data-source="post: 304396" data-attributes="member: 3278"><p>First off.....on that engine there is no idle jet. </p><p>Second, a "backfire" is normally an indication of a lean condition, not a rich condition.</p><p> </p><p>There is a mixture screw controlling mixed air and fuel through a passage to the top of the carburetor. If you have two mixture screws this is the one on top.</p><p>The mixture screw should have resistance to turning which indicates the packings are properly adjusted. If not then turn the 7/16" nut that surrounds the idle needle clockwise a little until you feel resistance. This will assure no air is being introduced at that point. </p><p>Back out the idle screw to 1 1/2 turns from a LIGHTLY closed position and start the engine at idle. Make sure you have water in your tank well up the side of the exhaust housing. If the engine runs normally but rich at that setting then turn in 1/8 turn at a time until the engine starts to run cleaner and crisper. When you have gone to far the engine will start to lose RPM and probably backfire or spit back. At that point reverse the needle to the highest RPM and go around another 1/8 to 1/4 turn.</p></blockquote><p></p>
[QUOTE="Pappy, post: 304396, member: 3278"] First off.....on that engine there is no idle jet. Second, a "backfire" is normally an indication of a lean condition, not a rich condition. There is a mixture screw controlling mixed air and fuel through a passage to the top of the carburetor. If you have two mixture screws this is the one on top. The mixture screw should have resistance to turning which indicates the packings are properly adjusted. If not then turn the 7/16" nut that surrounds the idle needle clockwise a little until you feel resistance. This will assure no air is being introduced at that point. Back out the idle screw to 1 1/2 turns from a LIGHTLY closed position and start the engine at idle. Make sure you have water in your tank well up the side of the exhaust housing. If the engine runs normally but rich at that setting then turn in 1/8 turn at a time until the engine starts to run cleaner and crisper. When you have gone to far the engine will start to lose RPM and probably backfire or spit back. At that point reverse the needle to the highest RPM and go around another 1/8 to 1/4 turn. [/QUOTE]
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1959 Johnson FD13 spits and spudders while idleing... why?
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