1150 GS ADVENTURE RUMBLE IN 4TH

Pauly S

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Hi All,
i have a 2004,1150 gs adventure, non abs,6 sp with a strange thrum in 4th gear. whilst in this gear, at any rpm at aproxx every 50 metres you can feel a vibration coming through the bike, "Athrumming" , in gears number 1,2,3,5,6, it doesnt happen.
i suspected bearings as the final drive seal on the gearbox had gone,(surprise, surprise), but alas no, the bearings are all like new and the inside of the gearbox was like new too, with no swarf anywhere, almost surgically clean.the prop uj's are like new too, but the splines are a bit sloppy at the front and rear, with the prop middle splines being perfect.
the bike has covered 25000 miles, and bmw dont want to know cos i bought it outside of the bmw dealer network, as much use as a chocolate fireguard.
Any ideas lads?
Many thanks for your help.
Almost forgot to thank Darren at Motorworks for all his help,TOP MAN..
Whoops sorry chaps , posted this thread in the wrong place last time, i dont know, these new boys!!!
 
My gearbox has had a whining 4th gear for the last 55K miles.Doesn't seem to get any worse but am fitting another gearbox in the coming week.
The noise sounds like a couple of gear pinions rubbing together when you engage 4th and the opinion from a couple of mechanics is that it could be the gear selector return spring and/or the selector drum not shifting cleanly.
 


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