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James,
These things are generally in two groups: the three screw group and the two screw group. Let's take the two screw group first. You'll need a screw driver and a spray can of starter fluid (ether). The two screws are a mixture screw (the needle valve) and an idle speed adjustment. Screw the mixture screw all the way clockwise and then back out 1 1/2 turns. Give it a shot of starter fluid and start it. Adjust the idle speed if necessary so that it runs at idle. Let it come up to operating temperature. Now adjust the mixture screw counterclockwise (you enrich the mixture). It should begin running quite well at some point, continue adjusting the screw ccw and it should begin to run rough. Note this position. Turn the screw cw (you lean the mixture) until the idle becomes rough. Note the position. Usually about half way between these two positions is the proper adjustment. You may need to fine tune slightly. Now that the mixture is set adjust the idle speed screw by reducing the engine speed at idle until the engine almost stalls. Increase the idle speed slightly above this and you are done. A similar process is used in the three screw group . There is a low speed mixture, a high speed mixture, and an idle speed screw. Screw both mixture screws in all the way,cw, then out 1 1/2 turns, ccw. Give it a shot of starter fluid and start it. adjust the idle speed if necessary so that it does not stall. Let the engine warm up. Now adjust the low speed mixture screw as described in the above paragraph. Adjust the idle speed screw as described above also. Now set the engine to full speed and adjust the high speed mixture screw as you adjusted the low speed screw. OK, the two mixture screws interact slightly so you now need to repeat the process of finding the points at which the mixture screws cause rough running and setting the screws half way between these points. Good luck, Dave M. |
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