11-28-2020, 09:34 AM
The camshafts of the CB1100 (as in my CBF) run in sliding bearings. That are those holders. The camshafts are specifically beded in the bearings. That's the reason, why the holders are numbered and shouldn't be interchanged. Nevertheless those bearings have some play, otherwise the camshafts couldn't rotate.
When the motor runs, the rotation of the camshafts perfectly centers the camshaft in the bearings. But when it stands still and is opened for measuring the valve lash, the tension of the timing chain pulls the camshaft in its bearing at one end of the camshaft and push it up at the other end of the camshaft. That influences the measurement of the valve lash and that's the reason, why Honda suggests in the Honda workshop manual, to loose the tension before measuring.
When the motor runs, the rotation of the camshafts perfectly centers the camshaft in the bearings. But when it stands still and is opened for measuring the valve lash, the tension of the timing chain pulls the camshaft in its bearing at one end of the camshaft and push it up at the other end of the camshaft. That influences the measurement of the valve lash and that's the reason, why Honda suggests in the Honda workshop manual, to loose the tension before measuring.