As suggested - gunk in the carb can cause the problem. As mollydog sugests - use the drain screw and see what comes out ... if it is even a little water/dirt then a complete carb clean is indicated.
If you have a clean carb .. then I'd look at the exhaust valves closing up .. this can cause difficult starting .. how long since the valves were checked?
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Regards Frank Warner
motorcycles BMW R80 G/S 1981, BMW K11LT 1993, BMW K75 G/S
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