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I noticed when I took it out it was engaging really late (4500-5000) and went through 2 belts in 45kms. We brought it into our shop and found the bolt to stabalize the motor was gone (95% of the problem) and the clutches were REALLY gummed up. We cleaned the clutches up to get all the old belt dust out and now it engages around 3000-3500.
Not to revive a thread from the dead, but isn't the spec for engagement RPM 5000 per the manual? If not I've been abusing mine for some time...
EDIT:
I checked the 99 service manual and engagement RPM is 4800 for the 600EFI, 5000 for the 500EFI and 3500 for the 580EFI Pantera engine.
/EDIT
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