Bought this new and have always run non ethanol gas in it. Ran perfect for last 4 years and now it surges all the time and has lost some of its power. Air filter is good, I checked the plugs and they are good. Today I replaced the fuel filter and checked the fuel lines and all seem fine. Friend suggested I put some seafoam in the gas and I did. Ran it for about 45 minutes and no improvement. The baffling issue is it seems to run fine going UP a hill but the power is still reduced. It has approximately 85 hours on it. Oil level is good. Moving the choke lever back and forth doesn't help it run any better.
Before I take it to the local dealer am open to suggestions.
