There is a cap over the needle with a spring to hold in place.(if it's the stock carb) With needle nose plyers grab,pudh and turn counter clockwise. You can richen the needls a bit with a shim,but if not bogging off idle don't worry about it.
A hair rich is o.k. How does it perform? Thats the most important part. You will have to play with your weights next to get the best out of it. I think 7.5g was a good match for your setup,you may have got some rollers with the pipe check it out.
As long as the plug is not ash white or spotted you should be close keep an eye on things. You want to go as big as possible on the main without it sputtering (= too ritch)
