If the Carburetor OEM is a Zama, then
>>You can View a Breakdown/IPL of the Carburetor and Get Technical Information on Zama Carburetors at this Site Addy; http://www.zamacarb.com/tips.html
and Select the Technical Guide.
If the Carburetor OEM is Walbro, then
>>You can View a Breakdown/IPL of the Carburetor at this Site Addy, http://188.8.131.52/
and Select Service & Aftermarket. Now Select Aftermarket Parts and Service. Now Select the OEM (Tanaka). Now Select Trimmer. Now Select your Carburetor (?) from the List Provided.
Please, Do Not Hesitate, If you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance.
Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Be Happy. Thanks.