Do you have the engine numbers and the units model number, starts with UT-????? The bolt you are talking about is probably the governed engine top speed or constant throttle adjuster. The spring is a constant, no lag, spring to help keep the engine from lagging when throttle is increased. Finally, you need patience on this site, as Homelite generators are not a very common unit that many techs work on. Even with the info I requested, I might not be able to help you out, because the last time I worked on a Homelite generator is about five years ago. What exactly is your problem? You need to give us a little more insite so we can narrow down our answers.