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On meyer.bikes.de I see no mention of left and right, though I see the same part # (0031027) which I presume is the early model. My local shop advises that there were 4 different versions through the years through models R51/3 to R69S. I previously had one shipped to me from NY which was the wrong one, that I shipped back. One version is for use with engines with 'flat tappets.' Which are these? Meyer's has two priced at 119 Euros and one for 199 Euros.
I would appreciate some experience-sharing!
Regards, Ken Cruise
Shows r51/3, r67/3 r50 r60 11310031027 300 degree camshaft was replaced by r50/2 r60/2 11310031028 camshaft
Their also a sport cam 328 degree 11310031033 for the above models
R68 and r69 r69s and r50s have different part numbers
https://bmwclassicmotorcycles.com/index ... 1310031027
54 R51/3 55 R50/Velorex 560 sidecar 64 R27 68 R69US 75 R75/6