Oil pump; 5.5 bar vs. 4.5 bar; counter-balance shaft compatibility
Hello to K-Bike folks;
I'm new to the forum. I own and ride an '87 K75 and an '06 K1200s.
There is something that has me puzzled on the K1200 that I hope someone here may be able to shed some light on. First of all, I am moderately well informed on the bike; I have done my share of research and have gotten to know the machine fairly well. I have actually posed this question to a long time BMW Tech; to his credit, he said that he really does not know the answer as opposed to giving me some BS.
I have some internal bits that I am going to be putting/changing on the K40 this winter( K1300 Clutch and thrust adapter ). From my old hot-rod days, oil pressure was never a bad thing so I would also like to change out oil pump. My understanding is that the 5.5 bar pump configuration is a 26/24 tooth drive/driven arrangement with a high pressure relief setting in the pump itself with existing being 25/25.
The parts fiches I have seen indicate that the 5.5 bar pump must be used with the later, 2011-on counterbalance-shafts. These are unrelated systems. Has anyone had the chance to look at the setup(oil pan and clutch cover removed) to verify if there is an interference that would be caused by the drive chain on the 5.5 bar pump on the K1200 counter-shaft? Is there something else that I'm not considering?