Normal plug residue ?

pelletman

Cadet
Joined
May 25, 2010
Messages
26
My 125 hp is running low rpm at wot. Max rpm was between 3000-3500 this yesterday. Its a new engine for me, so haven't done a compression check
yet. All 4 plugs were face coated in a hard thin burned film of carbon. I am
changing the plugs, but am wondering if this is normal? What else should I
look at for low rpm?
 
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