Can anybody help! Ihave a fault on my 99'650 s while under load in any gear I get a power loss at around 7000 rpm can anyone give me an idea as to what the problem could be?

 

Well......
Power loss starting at 7000 and continuing up until redline???
Power loss from 7000 to a certain rpm and then pulls normally till redline??


Wouldn't hurt to check these anyways.....

Dirty/old air filter
Spark plugs/Ignition system (bad coil/wires/plugs)
Fuel mix for cleaning carb/injectors (gum in carb/injectors/system - reducing fuel flow)