Posted by Steve@Advance on July 08, 2017 at 18:18:58 from (66.169.147.211):
In Reply to: Massey 2135 posted by MFnewbie on July 08, 2017 at 17:31:51:
You'll need to do some diagnostics when the problem occurs.
Check for spark at the plugs. You can make a spark tester from an old plug, just break the electrode off the end. As soon as it dies, be ready to put the test plug on a plug wire, lay the metal part against a metal surface, crank the engine over and watch for a strong, blue spark. If weak or no spark, could be the points or condenser, coil heating up and failing, points out of adjustment, worn distributor bushing.
Also can be fuel related. There is a plug in the bottom of the carb. With the fuel valve on, engine not running, remove the plug and catch the flow in a clean glass. The flow should start as a full stream, then slow as the bowl empties. But it should continue to flow a stream, not slow to a drip or stop.
If the flow stops, there is a restriction between the tank and the carb. Check the screen in the sediment bowl, see if fuel will flow with the valve open and the bowl removed. If not, there is a restriction in the tank. There may also be a screen in the inlet elbow at the carb. If there has been an inline filter added, it may be too restrictive for a gravity flow system. Be sure the gas cap is vented. Even if it says "vented", try loosening it. It may be clogged or manufactured wrong. Also, be sure the fuel line is steel, not copper, is routed the most direct route with no kinks, and is as far away from the exhaust as practical.
Finally, look at the fuel that was collected. If it is contaminated with water or rust flakes, the same will be in the carb. It may need the tank cleaned out, and the carb disassembled and cleaned. The carbs are simple, don't be afraid of it.
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