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Ah didn't go for the old trick of thinner oil in the drive train ;) reduce the actual transmission loss than on the calculated one. Some people use different heat range of plug too
On anything I have had on rolling roads, I've never cared for the BHP reading. It is a bit variable from day to day on the same machine and some machines being optimistic and other pessimistic. Just want to know that the fuelling and ignition is right.
Thing is, the graph doesn't have a revs axis. How best should I interpret this?