My Honda HR21/HR21.5 starts ok and keeps going whilst cutting my lawn, but whilst doing so the engine "hunts" as if starved of petrol.

When l bought the mower some years ago, l was told that it required 4 star petrol(UK) and l have added a substance supplied by our locaL petrol outlet to the unleaded petrol l regularly use.

Paul, April 2007

there is a spring on the carberator that sometimes comes off, that happened once and the speed hunted. This year it was hunting, I took off the float bowl on the carburetor and found that the needle came untatched from the float, becare ful you don't lose the pin or needle pin

Ted, July 2007