6 year old mower with no prior problems until it started surging at idle and mid range. I change plugs every year, use non ethanol fuel, change oil every 50 hours. I recently replaced the fuel filter which was non standard. Any suggestion on what I might look at?
If engine started surging after replacing fuel filter replace with OEM Kawasaki filter. If Kawasaki, keep it all Kawasaki. Also check air filter for replacement.
