
11-09-2009, 08:40 PM
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CC Member
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Join Date: Mar 2006
Location: San Marcos california,
CA
Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
Posts: 1,605
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Not Ranked
All engines have a harmonic imbalance at about that RPM.....1800-2400 roughly. This is normally cured by balncng the rotating asembly.
So it cold be the damper..or an out of balance flywheel or clutch disc. I have seen a nd repaired engines that have cracked Bellhosins because of this imbalance John 
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