Sorry, I did link the owner's manual by mistake, the service manual is this one which did not show up for me in the search on their site because it's listed under Trail 125 instead of CT125: https://www.helminc.com/helm/product2.asp?Make=AHC&Model=TRAI&Year=&Category=&class_2=AHC&mk=Honda+Powersports&yr=All+Years&md=Trail+125&dt=&module=&from=result&Style=helm&Sku=61K2E00&itemtype=NThanks. This is not the small booklet owners manual that comes with it is it?
It should say "2021 Trail 125A Service Manual" and Item/Part #: 61K2E00
As @AZ7000' mentions it makes many references to the common service manual, so you may want to buy that too if you end up finding the need for it.
Common Service Manual
The Honda Common Service Manual is part instruction manual, part technical reference manual, and part service manual. As such it helps readers understand mechanical, hydraulic, and electrical fundamentals, learn the function of components, and perform troubleshooting and servicing procedures...
www.helminc.com
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