Ducati Monster strange whirr noise from engine

2001 Ducati Monster Problem

CarDucati Monster s4 - 916 engine
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My ducati has developed a "turbo" type whirr from the engine, it increases in pitch with the engine speed and occures wheather in gear or nuetral clutch in or out. Have been advised by a ducati tech that its the belt idler pulley bearings or belt tension incorrect Replaced them all and checked belt tension, no change. New clutch housing bearings, no change. Timing belt drive shaft feels tight. Alternator side outer crank bearing is OK.
what else?
Problem Category
Engine, Cooling System & Drivetrain

Gearbox & Clutch

Steering, Suspension, Brakes, Wheels & Tyres

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