help with my pulse adrenaline 125

[spencer2004]

Luckily your engine is used in a lot of Chinese motorcycles, which are:

Superbyke RSR125, RMZ125, RMR125
Sinnis Max, Stealth, Apache, Blade, Trackstar, Vista
Lexmoto Street, Lowride
Pulse Adrenaline
Qingqi QM125-2F (Ranger), QM125-2D, QM125GY-2D (Tracker)

And I think Suzuki GS125, GN125, DR125, DRZ125

As far as I know the engine can be switched between models as the mounting holes are all the same. A brand new engine costs £500 but you can often get them second hand for as little as £100 on eBay.

If you want to try and repair your engine instead of replacing it then you should get the Haynes manual for 125cc Chinese motorcycles. The manual says that a knocking sound could be down to Carbon build up in the combustion chamber, an overheating problem caused by an incorrect spark plug or an incorrect fuel/air mixture, piston ring or con rod damage caused by lack of luberication or overheating, incorrect valve clearences, damaged valve springs, head gasket leak, exhaust leakage, loose bolts or damaged bearings to name a few.