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Here is an update on the DR200SE project. It has been almost constant rain since I brought it home, so I have not done much. I have made a few local rides to get acquainted with it's "personality".
It has good torque from right off idle and a smooth power delivery at low rpms. My technique for hypermiling is to shift up through the gears quickly keeping the rpms to a minimum. This motor seems well suited to this task suggesting very mild cam timing. I found some (unverified) cam specs online which would verify this. Here-
stock DR200 cam
_________lobe lift______valve lift____Duration at .050"
Intake____.245"________.320"_______204
Exhaust___.230"________.290"______ 200
I also ran a compression test and was surprised to record a 185 psi reading. I repeated the test two more times with the same results. My gauge is the kind that you press in to the spark plug hole as opposed to screw in. You could feel a good strong pressure which makes me think that these readings are accurate. I am very pleased about this.
I also pumped up the tires to spec, changed the oil using 10w30 petrol based oil and lubed the chain.
When the weather clears up I hope soon to have some baseline mpg data to report.
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