Posted by Steve@Advance on August 14, 2015 at 07:59:19 from (108.245.66.82):
In Reply to: Surging posted by cellerdoor on August 14, 2015 at 06:19:38:
It's too lean.
First, check for vacuum leaks. Look for loose carb flange bolts, intake gasket leaks, anything that can cause a vacuum leak.
Then try opening the main jet adjustment, about a 1/4 turn at a time, see if that helps.
Next thing to check is fuel delivery to the carb. There is a drain plug in the bottom of the carb. With the fuel valve open, remove the plug, be ready to catch the flow in a clean glass. The flow should start as a full stream, as the bowl empties the flow will slow to a trickle, but should not slow to a drip. If the test fails, check the screen in the sediment bowl, there may be another screen in the carb where the fuel line connects. Try opening the fuel valve with the line disconnected from the carb, should get full flow. If not the problem is in the valve, or tank is contaminated with rust. Also look at what was collected in the glass. If it's contaminated with rust, dirt or water, those problems need to be addressed before servicing the carb.
If there is contamination in the tank, it will also be in the carb. Don't be afraid of the carb, they are simple and field servicable. A quick fix is to remove the bowl and clean everything up. Some spray carb cleaner and compressed air work well. Check the float level, check the jets for blockage, check the needle/seat for blockage. If the carb is in bad shape, a "comprehensive kit" will usually bring one back into service.
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