Our usual starting procedure is:
Fresh mixed fuel - a few litres in the tank
Blow through the fuel tank breather hose to prime the fuel pump & carby
Choke on
Ignition on
hit starter
if doesn't start, blow thru breather hose again or cover air box intake for a few seconds while starting
if this fails again, check plug
One common problem with these motors is, on a very cold day the starter motor struggles to engage the flywheel. So we take the plug out of the engine and keep turning it over until the starter motor solenoid heats up a bit.
As tator said, you need a good battery, the cheap 'alarm' style batteries aren't suitable for these engines, so get something decent.
Hope that helps.
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