Posted on Tuesday Aug 30, 2011 at 8:40 AM
Shakey Idle could be a gummy carb or fuel pump just starting to give out. Is that model inline or crossflowed. Try squeezing the primer bulb while it is idling and see if it clears up. When you say shakey you mean rpm's up and down or the motor looks like it is going to fall off.
You probably have air in the system. Just go all the way up then all the way down back up and bleed it off. DO that several times. If that don t help change the fluid.