Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
What engine , single cylinder or twin engine? Twin engine may be firing only on one cylinder. Single cylinder engine may be starving for fuel!
Check fuel supply to the carburetor. Will it run steady if you hold linkage at the carburetor?
!! OK. We have warmed up! Set record 81 yesterday!
Check the fuel supply from tank to carburetor. If ok, is this a SV series engine? It would have adjustable valves and valves may be too tight. If a CH or CV engine series, it will have hydraulic lifters and no adjustment.
Tight valves can cause surging and popping and smoke.