Hello all. I have a Subaru brand generator EX/30D with a Robin 10hp. Engine. It sat in the garage unused for about 6 years. It will run but surges. I've been looking at replacement carburetors online. The numbers on my carburetor doesn't  match any of numbers on the the replacements. My carb. Is a Mikuni . Nothing offered seems to be specific model wise.  Anyone know. Thank you

Found this:
 
https://www.ereplacementparts.com/subaru-robin-ex300d52011-engine-parts-c-133327_134933_136681.html
 
Surging is a symptom of running lean, carb partially clogged. 
 
Look at all the jets at the above link and make sure their clean... 
It's a simple carb however just a little trash in it will cause your symptoms..

Under page "I" is where the carb diagram is..
 
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Thank you for the information. It looks simple enough. I'll get it apart and see what I can do with it.