H's start good when cold, if it turns over good, winter grade gasoline, and engine oil like 10 w or 5w30 and engine in good tune and reasonably good shape. If you have a 6 volt battery in the original size battery box it can be difficult to find a battery that size with really good cranking cold cranking power and or ampere hour ratings. Like others have said, good heavy cables, starter in good shape, I will add on starter to make sure it has a center bearing as some did not and under heavy cold starting torque situations it can cause armature drag. And it does help some to turn on the lights for a little while to help surface of plates on battery to warm a bit. Slow charge for a while before trying works good also. Many variables. During cranking the voltage will drop to about 5 volts or less so coil will naturally produce a weaker spark than at normal operating voltage of about 7.2 volts. Low voltage causes less current to flow through the primary winding in coil there for producing a weaker magnetic field in the secondary coil winding and you end up with a weaker spark .
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