GS LC - discussion avec BMW concernant l'embrayage

Un article de BMW magazine aux USA revient sur le problème de l'embrayage avec un interview d'un officiel BMW.

Les points importants sont:
- n'utiliser que l'huile préconisée par BMW (Castrol Power 1 Racing SAE 5W-40, API SL/JASO MA2)
- faire attention aux niveaux

NEWS | INTERVIEW Shift Shock Making the rounds on the Internet: possible clutch problems in the new BMW R1200GS. Jens Staebe of BMW Motorrad offers his opinion.   In our test of the new 2013 BMW R1200GS last issue (Summer 2013, pages 34-41), we criticized the odd separation behavior of the clutch and the resulting shift shock. Since then, we have heard from some readers describing the same issues while others seem to have more luck and report only smooth and quiet shifting. Can you explain this? Jens Staebe: The separation behavior of a wet clutch type of construction is affected by the supply of oil to the clutch plates. In addition to the use of the approved type of oil and the correct oil level, the intensity of lubrication of the clutch plates is crucial. The amount of oil is essentially determined by the cross section of the oil passages in the clutch pressure plate. Due to the present manufacturing process of the clutch and the tolerance range of the pressure piece, lubrication of the clutch plates and therefore the separation behavior may vary within a certain range.   What do you recommend for those who feel their clutch separates badly? Are there improvements that can be made? How about the use of certain types of oil? Have all authorized dealers been notified? Jens Staebe: Basically, a customer who objects to the separation behavior of the clutch should turn to his BMW motorcycle dealer. They would check that the approved type of oil (Castrol Power 1 Racing SAE 5W-40, API SL/JASO MA2) is being used and the correct level is set in each case. Any overfilling should be avoided. We are familiar with isolated confirmations of this separation behavior of the clutch, which is why we are investigating improvements. If technical measures should be necessary, we will inform our commercial network immediately.   Is only Castrol oil approved for the new BMW R1200GS? Can oil by another manufacturer also be used if it meets the required specifications? Jens Staebe: The approved Castrol Power 1 was extensively checked and tested under all operating conditions. Use of other oils from other manufacturers—even with the same specifications—carries the risk that supplements/additives might be included, which can adversely affect the function of the clutch. Therefore, until further notice, there is only this one approved oil.   This oil clutch problem was not known before the launch? There was a similar case 20 years ago, when the first generation of the BMW F650, also with a wet clutch, when changing to certain types of oil led to an undesirable side effect, namely slipping the clutch. Jens Staebe: The issue in the case of the F650 was the use of incorrect, non-approved oils that led to the slipping of the clutch. Problematic, for example, are additives that may impact wet clutches, such as those used in engine oils for passenger cars.