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Old 07-11-13, 21:39
Pleiades Pleiades is offline
XT-Moto SuperStar
 
Join Date: Aug 2010
Location: North Norfolk
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Loose crankshaft nut? Not unheard of and makes a noise similar to what you are describing which will vary and go quiet inconsistently at certain engine speeds.

Does it sound anything like this...



If it does and you catch it early, it's simple to fix. Just re-torque the nut to 120Nm and no lasting damage to main bearings/primary gears will be done.