It's got ypvs in dirty great letters on a fitting on the right hand side of the engine.
If you have a learner legal (haha) model it may just have what looks like a bolt sticking out of the rhs of the barrel.
Either way Google mk1 and mk 3 rd125lc. The mk3 had ypvs, the mk1 didn't. Look at the barrels on the engine. The difference is obvious.