Not Ranked
an off the wall suggestion ...
could the air filter be reaching a limit at 5200 and choking the engine?
Plug wires breaking down at that load?
Did it run rough when it ran out of puff ? Off the top of my head I'd have said valve float would cause erratic running.
I'd put a vote in for the rev limiter chip being off and shutting it down early.
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Pull a gear .... drop the hammer .... and enjoy the Drive !!
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