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• PRO

  Gary RK July 3, 2010 at 8:56am

  Hi,
  
  I believe that would be down the power head clutch dragging and not disengaging at tickover.
  
  It may be have 'debris' in it (unlikely) or it could have overheated/expanded and hence drag.
  
  Seperately (but not related), make sure you top up the gearbox on the attachment with the right grease. Stops this overheating as well...
  
  Update us when you know, as we run several combi systems (KM85's, KM130's) and knowledge is power !
• 

  Steven Whitaker July 3, 2010 at 9:06am

  Thanks Gary but it is both the string head and the hedge trimmer attachment that run all the time now, so I would see the problem being the power unit rather than the attachment. both attachments are regularly topped up with Stihl grease.
  
  gary @ affinity landscapes said:

  Hi,
  
  I believe that would be down the power head clutch dragging and not disengaging at tickover.
  
  It may be have 'debris' in it (unlikely) or it could have overheated/expanded and hence drag.
  
  Seperately (but not related), make sure you top up the gearbox on the attachment with the right grease. Stops this overheating as well...
  
  Update us when you know, as we run several combi systems (KM85's, KM130's) and knowledge is power !
• 

  Steven Whitaker July 3, 2010 at 10:28am

  Thanks Adrian, don't think its the fuel mix as I use the Stihl shot in a 5ltr gas can.....
  
  Adrian Hackett said:

  Make sure your fuel oil mix is correct if you haven't already. This can make a difference.
• 

  Sean Busby July 3, 2010 at 10:34am

  Hi Steven,
  
  my FS55 strimmer has been doing the same recently. Have been advised it may be the throttle cable not coming to rest at its natural resting place at idle. Visually I followed the cable from trigger to engine, and at rest, the linkage to which it is attached should butt up against the end of a screw, then swing away via the linkage when you pull the trigger. Difficult to describe I'm afraid, but if you have trouble then go and see a man who can.
  Good luck.
• PRO

  Will - WB Design & Construction July 3, 2010 at 10:42am

  Hi had the exact sam problem, it turned out to be the three springs in the clutch had streched with wear and needed replaceing. It is possible to do it yourself but I just got my local shop to do it. Hope that helps.
• 

  Tim Haywood July 3, 2010 at 11:04am

  I'm sure this is covered in the manual with a howto on how to adjust...
• PRO

  Nick @ NM Garden Services Ltd July 3, 2010 at 11:58am

  Sounds like the centrifugal clutch to me, take apart, brush with a wire brush and reassemble.
  
  It might also be worthwhile squirting some wd40 into the clutch housing after the machine has been used in the wet so as to prevent rust build up.
  
  -Nick
• PRO

  Gary RK July 3, 2010 at 12:52pm

  Steve.
  
  sorry did not mean to confuse..
  
  The clutch is in the power head and as it happens on all attachments, it is likely to be this.
  
  If the tickover speed is correct, cable adjustment. fuel mixture etc is not the issue. It's simply that the drive does not disengage at the right speed.
  
  If the tickover speed is set too high then the clutch will not disengage and you need to investigate whether it's simply a speed adjustment or cable adjustment ot fuel mixture screw (unlikely if its been ok previously)
  
  This mention of gearbox grease was just a FYI..
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  Steve Sonic Grounds Maintenance July 3, 2010 at 6:25pm

  Sounds to me like its the throttle button. Inside they tend to wear down (cable i think) and eventually they get stuck. I think you`ll find if you take it to a decent repair shop they will know the problem instantly and it wont cost you alot at all to fix.
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  Lawncare-4u.co.uk July 4, 2010 at 5:05pm

  is it not the 'slot' , plastic sleeve where it -connects-- to the attatchment ? ive had this inserted wrong and it dont turn/ spin end.........