David S.
Joined: 04 Apr 2008 Posts: 374
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Posted: Thu Feb 23, 2012 7:20 am Post subject: |
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Hard to say but these are some causes.
Over revved. High speed sustaind for a long period of time. (not a short bursts)
Lean low speed or high speed needles can prematurely wear out parts (not enough oiling)
Dirty air filter. |
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