At 65 to 67 hrs I've done 5 hones, had whole engine apart 2 times, changed 2 pistons, 2 crank bearing sets, con rod replacement.
Issue was too high compression from factory, at 15.4:1. It took long to realize, since air pressure gauge showed ok compression.
Fluid measurement went off the charts.
I have now deepened the head significantly and use 1mm base gasket (2x 0.5).
Finally, kick starter or electric have no struggles. Power is in abundance still. Somewhere in high 12:1 to low 13:1 compression now.
I did purchase and measure another GP head, and it was again same abnormal compression.
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EC 300 2008
EC 300 2018 GP
tenere 700
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