Hi, sixty-one hours on an about five year old Onan generator is total lack of use. You may have to rebuild the carburetor. But first, I would just let it run for at least one hour and try putting a load on it. It could also be carboned up from so little use. If it won't clear up by-it'self, then you need to take it to an Onan dealer. Some RV places can service and/or repair an Onan, but it's better to take it to an Onan only dealer.