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Old 12 Aug 2010
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optimal RPM during world trip? F650 GS

Hi,

Maybe a bit strange but I'm wondering what you guys think of the optimal speed / rpm on the f650 gs Dakar (2000). I feel that it's 'snorkeling' a bit around 3700 rpm. Above 4000 rpm she's great.

I'm talking about driving on tarmac or gravel. Normally I'll do 90 - 100 km/h with approx 4000rpm.

what do you think?
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Old 13 Aug 2010
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Balance the mpg against the speed. I get great milage at 60 or so, but it starts to drop above 70.
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Old 13 Aug 2010
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Quote:
Originally Posted by waztafel View Post
Hi,

Maybe a bit strange but I'm wondering what you guys think of the optimal speed / rpm on the f650 gs Dakar (2000). I feel that it's 'snorkeling' a bit around 3700 rpm. Above 4000 rpm she's great.

I'm talking about driving on tarmac or gravel. Normally I'll do 90 - 100 km/h with approx 4000rpm.

what do you think?
Not quite sure what to make of "snorkeling" . But, I remember that even my '06 Dakar (FI) was happier above 4,000rpm.
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Old 14 Aug 2010
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He could mean "Surging" or "hunting" at the lower RPM. I'm thinking an F.I. Re-map could solve this, going richer in the 1/4 to 1/2 throttle range may help. See BMW or after market to hack into the computer and change the map in the low range.

Due to the lean F.I. settings (for Euro 2 and 3) you will normally get this on many bikes. And this is why that BMW gets such GOOD fuel economy. Solving the Surging may cost a bit in fuel.
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Old 14 Aug 2010
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use 15 teeth instead of 16 in front and 49 for the 47 at the back (not sure tne english name, sprocket?)
it will increase fuell consomption but it will be easier on slow tracks
it will be easier to be around 4000 and not speeding
cheers
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