Quote:
Originally Posted by Walkabout
I used to like the belt drive system for the S/ST for highway riding but never have owned one, partly because of the various discussion in the fora over the years + I don't like to be a beta tester of any bikes so I tend to own models that have been "ironed out". Often the discussion referred to piston slap as one issue with this twin engine.
So, what has changed or was that all consumer "chatter"?
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Bmw's belt drive is worse then their rear differentials on the 1200s. Constant bearing failures on the early models and because of the materials they use for the eccentric in the swingarm it corroded alot meaning you cannot get the bearings out of the eccentric meaning you have to replace the whole thing. This doent seem to be as common an issue now mainly high milage bikes but you cant expect bearings to last forever right, seems the eccentirc is still made from the same material though making it nearly impossible to replace the bearing without just replacing the eccentric. No problems with the actual belt dirve itself though. Piston slap was a problem on early bikes again, which would lead to engine failure if left to long. BMW Updated the pistons aswell as alot of other parts inside the engine, cant remember what exactly. The new pistons were realised in ~2008 so bikes from that age should be ok, we have had customers do 30-40K miles on the new pistons and no sign of the problem reoccuring, early ones you would be lucky to get to 10k miles without deafening you.
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