New Troy-Bilt TB230 walk behind with 7.25 B&S engine. She runs great but engine is not smooth, she occasionally hiccups as I mow (never stalls) she is just not always smooth. Just me, is this normal?
Are you using gasoline with an ethanol blend? Many small engines do not run well with ethanol mixed with the gas. Just for the sake of trying it you might try a Premium grade of gasoline. It cured a surge on one of my mowers.
Have used stablil over the years but there is better stuff on the market then the stabil products. Startron makes some good ethanol products. The Startron SEF mix removes the hydroscopic properties of the ethanol to help prevent separation, also has some cleaning properties as well.