Twitching / "tjirp" sound

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Ramius

Race Dog
Joined
Mar 17, 2010
Messages
918
Reaction score
2
Location
Hermanus
Bike
BMW R1150GS
Lately noticed a "tjirp" sound when the pig is cold and "blipping" the throttle. (on the first split second while the revs pick up). Sound very much like a fan belt slipping. Yes, I know.. can be the alternator belt.. but I've checked the tension and its quite tight (can barely twist it 90deg).

Note that this is only when the bike is cold. any ideas?

Thanks
 
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