I've recently had the barrel rebored, head skimmed and a new piston fitted and was wondering how many miles I should do before I can take up the revs as at the moment I've done 200 miles and have been changing gear and 5000 rpm and not going over

This is for a dt 125 r

Obviously nobody has explained the ' running in '.

The main purpose is taking microscopic high spots off of moving parts and putting full heat cycles to fully seat components. Letting them seat fully.

You have rebuilt the top end of a 2stroke. Far simpler than any 4stroke that will need the 500mile treatment. All your seating is a little end bearing and the rings. The rest is ready done.

Far better advice is to ride normally but dont let the bike labour and stay away from full throttle for 30 or 40 miles to bed the rings. Thats it.

All I have ever done.

Okay cheers for that!! Saves me being bored having to change gear at 5000 rpm!