Doing a clockwise setting will probably work for a richening an idle setting. However I would put in a new plug run it at mid revs and hit the kill switch and have a look at the color and do it again for high revs any white and go with a bigger jet or raise the needle. On the electrode White is too lean golden to chocolate brown is best, black being too rich. You might want to change to a clip on air filter first and do the whole carb set up once.