Posted by Tom Fleming on January 02, 2010 at 15:08:23 from (206.193.247.91):
In Reply to: Cub hard start posted by J Wilbur on January 02, 2010 at 14:42:25:
Joe, you didn't mention if this is a magneto ignition or distributor. If it is a distributor, you may want to check the condition of your battery, and also the points. The ignition coil is a "step up" for voltage. When you crank an engine, the voltage drop on the battery is significant. The lower the voltage going into the coil, the lower the output of the coil. In cold weather, the voltage drop due to higher cranking amp requirements is even greater.
Another thing to check is the plugs and wires. Old wires with corroded contacts, or evern worse, old composite core wires (ie. not copper wire core) require a lot of voltage to fire plugs with a good, hot spark. Also, make sure both ends of the battery cables are clean and making good contact.
An old timer taught me that in cold weather, it is actually better to start a distributor tractor with a hand crank in really cold weather, as you are using the full voltage of the battery. Technique is rather simple. turn on fuel, put choke on, 1/2 throttle, and leave the ignition off. 2 full cranks. Set choke to 1/2 position, turn ignition on. quick crank. Will fire almost everytime, and often will run from there.
on the 72-79 Ford ignitions, they had a bypass wire (brown) that took voltage in front of the solonoid, so the voltage to the ignition was higher. Same concept.
Short recap: check battery to be up to full charge, check all electrical connections, check points and plugs. Sounds like your battery is getting weak, or you have some dirty electrical connections......or both
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