Stihl FS460 tuning

[growforest]

Hey Arbtalkers

Just back in the woods game after a few years walling and generally keeping woodchip free.  Have the above machine, but it wont tune.  Tried the basic throttle cable adjust, but it continues to overrun.  Can the ems be rebooted somehow or is it a techy job?  Hasnt done any work in quite a while.

Thanks in advance

Tom

[spudulike]

The autotune module has no facility for adjustment like you probably think it does, no silver bullets are there just a basic diagnostic and firmware upgrade. If the machine is over revving, has a fast idle etc then the first thing I would check is that the throttle is closing fully.

If you can, start the machine and try pushing the throttle arm on the carb completely shut, if this snaps the revs down as it should then you have a throttle cable issue - chaffed, poorly sited, control handle moved in to the wrong position, carb throttle return spring broken or the carb throttle shaft binding (possible if stored in a damp area or cleaned with water) etc.

If the carb throttle is closing exactly as it should then the next most likely issue is a big air leak - impulse line, inlet manifold or something like that but is less likely on a later machine.

Edited July 16, 2020 by spudulike