In time, your valve clearances may change and your carburetor can get some varnish build up. Add some Seafoam to your fuel periodically to keep your fuel system clean and depending on your mileage, you may need to adjust your valve clearances. Outside temperatures will effect how much choke you need to use, if at all. Typically, the colder it is, the more choke you may need to use. Try to start it without the choke and see if it starts. Gradually increase the amount of choke you use and find a spot where it starts easily.
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