Will only run when warm

I got it! First pull; it runs great. I think it was the bowl mounting screw. I’ve cleaned several times, but this time I ran a torch cleaning tool through it. Even though I soaked it in parts cleaner and sprayed it and blew it out before, I still got some dirt out of it. I also suspected the o-ring around the intake tube. The plate that the carburetor bolts to is pretty flimsy. I clamped a pair of vice grips on the flange where it is thinnest on top while I tightened down the mount bolts. Thanks everyone for your help!
 
Have you checked the intake manifold ?
To pretend the engine is cross flow B & S use a very long induction manifold from the carb side to the exhaust side where the valve is.
These were originally aluminium but that caused overheating so they went to a thermo setting plastic.
BEcause it is thermo setting it gets hard & brittle over time & heat cycles which leads to cracking and air leakage
 
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