300/440/550 550 starts then dies 10 seconds later.

I have a 550 which I rebuilt last summer and had it running perfect.

Took a 6month break and now it starts and dies after a few throttle pumps. Carb is the poopty bn 38 round body. Rebuilt it last year. I've taken it apart and cleaned it too.

Each time it dies, it'll start right back up, I'll pump the trottle (seems crisp and ready) then after the 5th Throttle pump it just dies. Rinse and repeat.

Thoughts? Any help would be appriciated. Cheers!
 
What's the compression and I had a problem similar and for me it was timing but for you it sounds like the carb. Have you tried a rebuild

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