Assuming the 4000 is a lot like a 641....
After 10 minutes it is either gasping for air or gasping for gas, or your coil has a short that opens up when it heats up. (Pretty blanket statement, I suppose.)If the tank isn't too full, loosen the cap and run for a while. The cap needs to be vented, some are not, is yours? (Ok, so the vent thing is true on my 641, I've never seen a 4000, someone should check this fact). If it still dies, check to see if you are getting a vapor-lock. This is because the gas-line runs between/through the manifold and can pick up a lot of heat unless it is properly insulated - If it's bare, crinkle some tin-foil around it. Are you getting gas enough? Pull the gas-line off the sediment bowl, grab a big coffee can and turn the gas on under the tank. A clogged filter in the shut-off will give you a stream roughly the thickness of a coffee-stirrer. A clean filter will let the stream of gas look almost the same thickness as the gas-line. Skipping to your question on the resistor. No. the voltage will remain the same. the amperage will drop. This is so the points don't burn up. Hope this helps. Hope at least some of it is correct.
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