A no load rev is when the bike is stopped and in neutral, But when riding would it be considered a loaded rev if you pull in the clutch while moving and rev it? People say no load revs damage valves etc.

 

The danger from no-load is ...it's easy to blow-past the redline.

You can cause damage, by exceed rpm limits by too much and/or too long.

It can lead to oil starvation of the mains and the valve train.
Valves can actually 'float' (the inertia exceeds the springs ability to
follow the cam on the down-side) leading to timing errors.

On older pre-electronic ignitions, the spark can lose it's ability to keep up.

This is generally an issue with earlier engines. Modern engines have rev-limiters
and electronic safe-guards. So, except for the really stupid, it's not really an issue.

Ern

 

Thank you.