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techtalk:evo:carb02 [2019/10/30 04:12] ixl2relax [WORKING WITH CV40 CARBURETORS] |
techtalk:evo:carb02 [2020/01/12 20:02] ixl2relax [The Idle/Transfer Ports Operation & Tuning] |
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| - | **Throttle Plate** - To assure the throttle plate is capable of closing completely, back out the idle set screw (on the side of the carb near the throttle cable cam) so that it is not limiting the closing of the throttle plate. Carefully loosen the two throttle plate mounting screws, slightly. After the throttle plate is fully closed and has centered itself in the venturi, retighten the two mounting screws (don't overtighten & strip the threads). Make sure the throttle plate rotates smoothly with the throttle cable cam. Set the position of the throttle plate, with the idle set screw, so that the bottom edge of the plate is closed just past the transfer port holes and is thus located between the single idle port hole and the multiple holes of the transfer ports. (If by chance, for any reason, you have the throttle plate completely off, be aware that there is right & wrong way to reinstall it. Be sure the plate is remounted with the right orientation because the top & bottom have an angled edge that needs to properly meet the carb venturi.) | + | **Throttle Plate** - To assure the throttle plate is capable of closing completely, back out the idle set screw (on the side of the carb near the throttle cable cam) so that it is not limiting the closing of the throttle plate. Carefully loosen the two throttle plate mounting screws, slightly. After the throttle plate is fully closed and has centered itself in the venturi, retighten the two mounting screws (don't overtighten & strip the threads). Make sure the throttle plate rotates smoothly with the throttle cable cam. Set the position of the throttle plate, with the idle set screw, so that the bottom edge of the plate is closed just past the transfer port holes and is thus located between the single idle port hole and the multiple holes of the transfer ports. In practice, this is easier on some CV40 carbs than others. Do what you can to keep the plate as closed as possible, but don't obssess on getting it exactly between those port holes. Your viewing angle is skewed when looking in there, anyway. |
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| + | (If by chance, for any reason, you have the throttle plate completely off, be aware that there is a right & wrong way to reinstall it. Be sure the plate is remounted with the right orientation because the top & bottom have an angled edge that needs to properly meet the carb venturi.) | ||
| {{ :techtalk:evo:carb:cv40-imscap-drillbit.jpg?200|}} | {{ :techtalk:evo:carb:cv40-imscap-drillbit.jpg?200|}} | ||
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| Both excess use and insufficient use of the enrichener may cause poor performance, erratic idle, poor fuel economy and fouled plugs. | Both excess use and insufficient use of the enrichener may cause poor performance, erratic idle, poor fuel economy and fouled plugs. | ||
| + | {{ :techtalk:evo:carb:cv40-enrichener-knob.jpg?300|}} | ||
| The Enrichener Knob is a friction function device. When mounting the knob, do not overtighten the mounting nut. The resistance/friction on the enrichener cable can be adjusted with the knurled nut. | The Enrichener Knob is a friction function device. When mounting the knob, do not overtighten the mounting nut. The resistance/friction on the enrichener cable can be adjusted with the knurled nut. | ||
| * Loosen the hex nut & remove the cable from its mount. | * Loosen the hex nut & remove the cable from its mount. | ||
| * Put an adj wrench on the flat part of the cable mounting sleeve. | * Put an adj wrench on the flat part of the cable mounting sleeve. | ||
| * Carefully turn the knurled nut to loosen or tighten the tension until the knob stays pulled out on its own yet freely can be pushed back in with reasonable pressure. | * Carefully turn the knurled nut to loosen or tighten the tension until the knob stays pulled out on its own yet freely can be pushed back in with reasonable pressure. | ||
| - | * Remount the cable & tighten the hex nut. | + | * Remount the cable with the lock washer behind the bracket & tighten the metal hex nut carefully (not over-tightening). |
| - | Check that the knob moves freely in and out after mounting. Do not overtighten the hex mounting nut. | + | Check that the knob moves freely in and out after mounting. |
| The fuel for the enrichener circuit is drawn thru a fixed jet in the float bowl. The air for the enrichener circuit is taken in thru the banana shaped inlet at the top of the carb face (see the face pic above). Sometimes when the enrichener cable is moved, or the carb has been taken off the manifold, the valve piston does not properly seat into its cavity on the carb. If that happens, additional attention must be given to properly reseating the enrichener valve piston. | The fuel for the enrichener circuit is drawn thru a fixed jet in the float bowl. The air for the enrichener circuit is taken in thru the banana shaped inlet at the top of the carb face (see the face pic above). Sometimes when the enrichener cable is moved, or the carb has been taken off the manifold, the valve piston does not properly seat into its cavity on the carb. If that happens, additional attention must be given to properly reseating the enrichener valve piston. | ||
