Posted by El Toro on August 21, 2008 at 18:54:15 from (205.188.116.73):
In Reply to: Old M still won't tun posted by Bob in E.Texas on August 21, 2008 at 17:37:37:
You need to do the "process of elimination". Check to see if there's good hot fire to the sparkplugs by pulling off one of the plug wires during cranking. You need to have the ignition switch on and if its a mag you need the kill switch in the run position. Since you say the engine runs a little, does it only run during cranking and quits when you let off the starter button? Are you using a ballast resistor?
Check for a full flow of out of the carburetor bowl should have a pipe plug. If there's just a trickle there's blockage between the carb. and gas tank. If there's an inline filter remove it.
Hold your hand over the throat of the carb and see if there's good suction on your hand while someone makes an attempt to start the engine. Poor suction on your hand is an indication of poor intake manifold vacuum. Could be the manifold gasket, loose nuts or bolts that need to be tightened. Worn rings, valves not adjusted with enough clearance or not seating properly in the cylinder head. Do a compression check on all the cylinders and see what the readings are. The engine should start when holding your hand over the throat of the carb.
Pour a few ounces of fresh gas into one of the sparkplug holes, replace plug and see if it the engine starts. If it does its not getting gas for some reason. Dirt in tank, gas line or carburetor. Hal
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