There is precious little info out there on cam setup for the 850R with stock cams. The cam wheels have 12 degrees of adjustment, though they aren't indexed, but I have a tool that fits over the cam and provides degree marks for adjusting them accurately.
So far I have tried stock (0in, 0ex), -1° on both, and +4°in, +2°ex.
Heres my basic understanding of how cam positioning affects the motor.
- Advancing cam timing brings the power band closer to idle. Retarding it does the opposite
- Adjusting the inlet and exhaust cams relative to one another alters the lobe separation angle (LSA). A narrower LSA will generally give you a peakier power band that drops off fastwe, and a wider LSA will give you a broader power band that has a less intense peak.
-1/-1: has a really great power band but it takes ages to get there
+4/+2: seems to breath much nicer down the bottom end but I am struggling to get full boost until about 4000 RPM
I'll keep posting here as I experiment. Post any setups you know below.