Help replacing 86 Spree throttle cable

[joew8638]

Hi all,
I just purchased my first honda scooter so please forgive me if this is a well known thing, but I cant figure it out.

I have an 86' Spree. I bought it with the throttle cable broken. I have a new throttle cable and if I connect to the handle and to the carb it runs/idles as it should ( Just draping it in the air). If I route it through all the cable holders to the back as it should, it idles too high! Is there some sort of adjustment for the cable?
Thanks!