These things dont work like you might think is logical .
From an idle , motor ticking over ( the idle mix has been set right ) when you turn the twistgrip the throttle doesnt actually open , what increases speed is that the timing plate moves to advance timing because at idle the timing should be close to ( even after ) tdc , untill you get to about ¼ . Moving the twistgrip past ¼ the timing plate acts on the carb butterfly and opens it as well as further advancing the timing untill about ¾ twistgrip at which point the carb butterfly should be wide open , after that further turning the twistgrip to full only further advances the timing as the carb is already wide open .
So , the idle speed is set by adjusting the timing at idle , obviously the carb butterfly must be open a whisker to allow some air/fuel into the motor .....see this is where a manual becomes a bit vital. I dont have the experience to advise on the correct manual but as I have said before it may be that you have to get a manual that covers several motors of the same model range and not one absolutely specific to your motor......and thats where I just dont know what to tell you to go for .
I have seen manuals for 9.8hp 110 model motors but not for the year you say yours is ....but I suspect any 110 model will be the same as they often made the same motor for several years...different stickers for different years . Hopefully someone will be able to say " this one " .
What you are needing to do now is called a "link and sync". If you google that with your model or year Im sure there will be videos on you tube showing you how ....Dangar marine is one , aussie boat guy is another ...and there are others too
