I know I have got to trust my instructor after all thats what he trained for using a reputable school. He adviced me to ensure total control of my Honda S-Wing 125cc Automatic ... to use my rear brake .i..e left hand brake lever and accellerate taking it to 5000 rpm and then use the brake to control my speed as I am manoevring for U turn... Obviously being a learner driver this is totally new to me, if it had been a manual bike I could have understood it but it is an automatic bike with Standard versions of the S-Wing feature the enhanced braking ease and control of Honda’s innovative Combined Brake System. Linking together the operation of a single 240mm three-piston calliper front disc brake with a 220mm single-piston calliper rear disc, with Drivetrain


Clutch Automatic; centrifugal
Transmission Type V-Matic
Belt Converter Ratios 2.64~0.82
Final Reduction 9.86
Final Drive V-belt

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It smelled terrible obviously reving too much but I did take it to 5000rpm and yes control is steady but I could smell hot asbestos... Help is the advice correct or am I ruining my own bike with the wrong advice [i].. Any Instructors please confirm or Technicians, or any one that knows?

This is kinda tricky.

Normally using plenty of revs increases the gyroscopic effect, meaning the bike is easier to control at slow speed. But like you said, with an automatic clutch, this can increase the wear & tear on the bike.

My feeling is that if you are capable of doing U turns 'comfortably', at lower revs... do so.

Other than that, I'm willing to be proven wrong. I taught myself, so reckon I have plenty of bad habits & am not the best person to give advice.

If you can smell it its slipping too much and getting hot , i would be inclined to use less revs (obviously you would still need a fair amount ) but i wouldnt take it as high as 5000, and still use the brake to help control the speed.
Try practising your turns at different rev ranges to find a level thats comfortable for you, and that doesnt put too much strain on your transmission.
HTH

Get him to demonstrate how to do it on your bike.
All you need to do a u turn is a lot of practice to build up confidence.

Best to talk it over with your instructor but I'd imagine he wants to you keep the revs steady to maintain the turn and dab the brake to regulate speed (rather than shut the throttle). If you have the brake on permanently you will destroy the clutch.