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"I have to be pumping it while cranking"...... Carb issue , sucking air in fuel line , fuel pump .... restriction in fuel line ... dirt in tank etc...

fuel issue ....

1. weak spark. 2. choke not closing . 3. low fuel pressure . 4. Carb internal concern ( leaking down ). 5. sucking air in fuel system

is the choke flap opening up at least 1/8 drill bit ? Does it help by using your finger and opening up or closing choke flap slightly?... If answer is NO.. then it sounds like internal carb issue ... ONLY 5 seconds into RUNNING time rules out carb icing up ... UNLESS you have factory stove and...

Is it cold where your at ??? Did you pump gas pedal once ? ... DId choke completely close after one pump ?... once started ... did choke pull off work ( roughyl 1/8 drill bit between flap and carb throat )? IF all OK .. is intake below carb COLD when running for a couple of minutes ?

I worked on a 225 years and years ago with a bottom end noise .. we wanted to see how long it would take to completely grenade ... So we revved the snot out of it , it also let loose behind the starter ... must be weak point ...