i have a j.d. trailfire that is really hard to start. once i do get it started up it doesn't want to stay running unless i hold the throttle open some. then when i go to take off it is like it is built up alot of gas and boggs real bad when i take off. it will continue to bogg till about 10mph then it will take off. any ideas? i have cleaned the carb on it. does anyone know where the clip should be on the needle? what about what size jets shoudl be in it? any help would be appreciated.