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Thanks for all the responses guys. I think I’ve solved the issue. Basically the TOB wouldn’t go back far enough, because with the 1/2” bracket packing block removed, it rubbed on he back of the bellhousing as it rocked. So today I ground 3/16” of the sides of the O.E. fork and raised the pivot bracket 1/8”. This allowed to to swing back another 3/8””. So the TKO is now mounted and there’s 1/4” free play between the TOB and the clutch fingers.
I still think the flange SCAT put on this OE spec crank is too thick. It would be better if the flywheels was 1/4” further back, but obviously removing the crankfor remachining is unthinkable on a new dynoed engine.
The remaining problem is that starter engages with the ring teeth only 70% but compared to whatIi faced this morning, that’s a small nut to crack.
Thanks again guys.
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