Posted by Tom Fleming on November 19, 2013 at 17:38:07 from (67.20.233.75):
In Reply to: super a compression posted by mtf on November 18, 2013 at 17:12:49:
as Gene and others have alluded to, if you are "running on" that means there is hot carbon in the cylinders. Carbon comes from incomplete combustion. Jim is also right, don't throw parts at this problem until you figure out why it is running rich.
First off, is the air cleaner clean and getting full flow of air. Is the cup plugged with debris? does it have good air flow?
Next, is the carb working properly? is the float sticking open? Is the mixture right? Some of the zenith carbs have a mixture adjustment jet, others have a fixed jet. If you have a "T" screw in the bottom of the fuel bowl, that is the mixture setting. If not, you have a fixed jet. For one thing, make sure that the jet is actually in the carb. I have see a few where they were missing.
Check these things first and figure out why you are running rich. Then we can move on to other things if she doesn't' perk up after getting the fuel mixture right.
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