With out the choke, the plug is not likely to have visible fuel condensate. If after priming it fires, sputters and dies then likely there's a problem with fuel delivery. If you're using fuel more than a month old, replace with new fuel (fresh from pump) and mix.
Check the following
If still doesn't run, then likely the carb needs a clean/rebuild or replace. You could try Seafoam (or similar) additive. There's also a possibility of a crankcase leak.
Keep in mind a china duplicate replacement carburetor for this unit is ~ $10, delivery included (USA), from Ebay or Amazon.
SOURCE: 25cc TB25BP new plug, new Gas, Clean Carb.. will not start
Check Make sure its the right plug.- Check for stuck choke-Check.Air/fuel mixture screws out of adjustment.
SOURCE: 2002 escape miss fire on cylinder one
power not reaching cylinder 1 ignition coil. check electrical connections and wiring for any damage. test for power and ground at cylinder 1.
hope this helps.
SOURCE: weedeater 25cc electolux motor does
Make sure when you test for spark, you use a spark tester or at least ground the base of the plug to the engine when you use the pull start. A strong little blue spark should be present. The airgap between the coil and the flywheel may need to be adjusted. The specs are about .010-.016" or the thickness of a regular business card. You would have to loosen the two coil screws on the back of the engine's cylinder if you have checked and determined it actually needs adjusting. Covers will be have to removed to get to this location. Torx head screws hold everything on these together.
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