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27-04-12
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#1 (permalink) |
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Senior Member, Raffle Sponsor 2009, 2010, 2011, 2012
Join Date: Jul 2009
Location: near Guildford,Surrey
Posts: 101
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stihl 660 losing power
hello all, was using my stihl ms 660 today and found it wasnt running well at all. It seemed to run ok with the throttle pressed halfway down but if I pressed it right down the saw would slow right down. It also started stalling at random so I got fed up with it and now i'm scratching my head as to whats causing the problem (has always been fine in the past). Was wondering if anyone has any ideas what the likely cause could be? Thanks, Rob Stringer
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27-04-12
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#2 (permalink) |
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Senior Member
Join Date: Aug 2008
Posts: 1,426
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Air filter blocked?
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HARRY MOCKETT TREE SURGEONS NORTHAMPTONSHIRE |
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27-04-12
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#3 (permalink) |
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Senior Member, Raffle Sponsor 2009, 2010, 2011, 2012
Join Date: Jul 2009
Location: near Guildford,Surrey
Posts: 101
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Re: stihl 660 losing power
Quote:
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27-04-12
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#4 (permalink) |
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Senior Member, Raffle Sponsor 2012
Join Date: Nov 2011
Location: West Sussex
Posts: 2,726
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Re: stihl 660 losing power
Quote:
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27-04-12
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#5 (permalink) |
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Senior Member, Raffle Sponsor 2012
Join Date: Nov 2011
Location: Devon
Posts: 1,852
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Re: stihl 660 losing power
Simplest things first.
Sounds like fuel shortage, enough to run at 1/2 throttle, but not enough for any more throttle, so then runnng weak. Check pickup filter, AND the internal carb gauze. Take it from there.
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Aspen dealer and garden machinery sales/repairs in Devon |
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28-04-12
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#6 (permalink) |
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Senior Member
Join Date: Aug 2008
Posts: 1,426
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Quote:
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HARRY MOCKETT TREE SURGEONS NORTHAMPTONSHIRE |
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29-04-12
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#7 (permalink) |
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Senior Member, Raffle Sponsor 2012
Join Date: Sep 2010
Location: Hertfordshire
Posts: 3,726
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Re: stihl 660 losing power
I third that
 Fuel filter possibly, internal carb gauze filter very likely and also a blocked breather likely - you cna try the "leave the fuel cap loose" trick and see if it works better trick.Let us know if none of these work and we will suggest a few other things to check.
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Spud: Life is tough but it's tougher when you're stupid |
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