Can anyone help with a 5jj r1 engine question, my son bless him has bought a mnr vortex with a r1 fitted the 1st engine lasted 80 miles before if failed, a replacement 5jj has been fitted sounds ok performs well but does breathe vapor from the gearbox breather, all it has is a small filter fitted vented to atmosphere is this a common thing with a motorbike engine.
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