Actually you have round slide carburetor, Walbro 26mm round slide you may want to do an internet search on that think those are mechanical and not CV.

So you should be OK with a cone filter, you have to play with jetting.

good luck finding jets for that...
may try here first?
http://wem.walbro.com/walbro/family.asp

If you can get a part number off the carburetor that would help.