Motor wont rev above 1500 rpm - 2002 BMW K 1200 LT

Try changing your fuel filter, if that does not fix your issue I would have the catalytic converter changed.

Might be worn engine bearings.

Run a fault code test as a starting point for diagnosis of this problem, learn how to do that here

check the tps on the output side with a voltmeter, it should vary from zero to five volts

that sounds like a fuel delivery problem. either the filter is clogged or the pump is not delivering the right pressure. i assume you have no check engine light. this would not set one but other problems like sensors would. being 11 yrs old i would not be surprised if the fuel pump was worn out. good luck

All late model vehicles have built in Rev Limiters to prevent catastrophic destruction from no load over speed of the engine. Check with your dealer Service Manager to find out what RPM your engine is governed to.

Fastest Robe

fuel pump may be bad or catalytic convertor may be plugged

Have the alternator tested. You are providing a low charge to the battery when you jump it and when taking it above 2K RPM requires more amperage resulting in the engine dying and the rough idle

the rpm will drop after is starts worming up a bit and it will build pressure be for it drops.