Posted by rust collector on February 10, 2009 at 13:55:02 from (130.18.53.203):
In Reply to: 454 lacks power posted by nosoup4u on February 10, 2009 at 13:22:49:
OK, first check would be basic engines 101 for a good theory of operation of spark ignition engines. Assuming that you had someone who knew what they were doing to rebuild the carb and set the float level and power and idel screws correctly, the next place I would attempt would be to re-adjust the power needle valve. A good starting point if the engine will not run is to screw the power needle valve in until it lightly bottoms out, then screw it out 1 & 1/4 to 1 & 1/2 turns. Fine adjusting can only be done correctly with the engine running. With the engine running and throttle wide open, screw the power needle in or out slowly, no more than one turn, making the fuel mixture leaner (screwed in). When the engine reaches full rpm, and warm, move the throttle lever quickly to idle, then full throttle and back to idle. If the engine is slow to respond or skips as it accelerates, screw the needle back out until the engine will accelerate without skipping. Next look at the air cleaner. Simple check would be to disconnect the breather from the carb. Black smoke is an indication that mixture is too rich for the air being taken into the engine or that the spark or compression is not adequate to fire the mixture in all cylinders properly. Check the spark by grounding out each plug with a screw driver, one at a time and listening for a change in the sound (engine skips, or just hold each wire in your hand as the engine is running). If not all plugs fire, consider replacing plugs, wires, points and condenser. Then check timing of the engine. Further would be to run a compression check. #1 Mechanic's rule is to take each step slowly, focus on what was changed since the engine ran correctly and eleminate that as a possible cause before you mess up something that does not need to be changed, ending up with several problems you don't know how to deal with.
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