I think that was the first year fuel injection? I would guess stale gas and possibly fouled spark plug, possibly restricted fuel sock/filter.
If I’m wrong and it has a carb, gas goes stale fastest in small quantities when exposed to air. At the bottom of the carb bowl is a drain screw. Once the old gas has run out, open petcock for a sec, to flush, before closing the drain.
06 Rincon 680. Foreman headlight conversion, Guru bumper, Warn XT30, Maier guards, Bighorns
05 Foreman 500 FM, 2.5 Warn, Bighorns
Dually Ram and Patio Hauler 5th wheel