stihl 088 weak spark

[13glen7]

Woodruff had gone again put another in and tried tuning and its getting better but still seems a little rough seems to idle up and down . As above anyone know what might be causing the key to keep breaking?

[spudulike]

Woodruff had gone again put another in and tried tuning and its getting better but still seems a little rough seems to idle up and down . As above anyone know what might be causing the key to keep breaking?

 

The key is meerly a location so the flywheel is located properly. It doesn't actually lock the flywheel in place. The flywheel is held in place by the compression of the flywheel against the conical faces of the crankshaft by means of the nut on the end of the crankshaft.

 

If the flywheel key keeps breaking then the flywheel and crank havent been cleaned before assembly or the nut isn't being done up tightly enough. I usually crank them up pretty damn tight as a wayward flywheel may well total the machine - there are Stihl recommended figures but tend to use the feel of the tools!