Stihl MS 290 carb

[jpilk99]

Hi all,

My MS 290 was running worse and worse, so I bought a replacement carb.  Ran great for about 10-15 mins and now won't even start.  I have spark and compression of about 135psi.  I'm seeing 2 different carbs online and not sure which my saw takes: 

HD-19B
Carb. HD-18B-HD-21B (only USA)

Is there a way to know which is the right one?  I am in USA.

Thanks,

Jay