FS80R "ringing", sound at idle.

[joea99]

Replaced carb on FS80R with an Amazon unit. Started right up and seems to have great power. Idles OK except for the "tinny", "ting-ting" sound I hear. I thought it was some loose metal part, but It goes away with full throttle.

Worried it might be detonation or something bad.

Fresh 80 octane with Stihl synthetic at 50:1. Very recent spark plug.

 

[StarTech]

Check your post at Jack's.

 

[slomo]

80 octane? Is that a typo? Must be some US Army fuel LOL. Tinging sound might be the clutch for the driveshaft. Or the revs make the engine so loud you can't hear it??

slomo

 

[Fish]

Yeah, change your idle speed a tad, it should go away.

 

[upupandaway]

Replaced carb on FS80R with an Amazon unit. Started right up and seems to have great power. Idles OK except for the "tinny", "ting-ting" sound I hear. I thought it was some loose metal part, but It goes away with full throttle.

Joea, while the trimmer is making that noise, slowly pull the starting cord about 2inches - maybe a little more or less and hold it there. Does it go away?