Ideally you need the cam P# and then make a call to TRW for that. Maybe their website will have it if you have the P#.
Suggested would be .027 int/exh hot.
What is typical valve lash setting for solid lifter cams
SOURCE: valve clerance for yamaha xj 650,what is the clerance of exhuse and intake?
xj650(uk) and xj650j
inlet 0.16 - 0.20mm
exhaust 0.16 - 0.20
all other models
inlet 0.11 - 0.15mm
exhaust 0.16 - 0.20mm
set when cold
SOURCE: how to time a camshaft without a cam card
Not sure I am following, but it should like instead of simply lining up the marks as one would normally do, you want the theory?
Anyway, the point of a camshaft timing is to not only make sure the intake opens when the piston goes down, closes going up for compression, stays closed while going down for power, but then opens going up for exhaust, but that it also matches the distributer.
The easiest thing to do if a cam had no marks, would be to compare it with the original, and just transfer the marks. If it is more of a "full race" cam, it will have lobes more advanced for opening, but will also have more lobe retention on the other end as well, so will still be symmetric, I believe. In effect a less sharp lobe. Anyway, the angle is always given relative to TDC on the crankshaft.
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SOURCE: + I have a 67
you would adjust as a normal stock engine, there is no gap spec for this, you will want to just snug rocker arms so they are not sloppy, turn motor over by hand and proceed to adjust each valve. run motor a few to prime lifters and then re-adjust valves as needed. Always soak lifters in oil for a day or two or prime by hand before install, as well as grease bottom of lifters before install on cam lobes
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