Motor: 125cc zhongshen motor (some come with differnet ones) when i got mine it didnt start got it going eventually, the motor in the mxb has got a good point and lots of bad points the good point is it is very quick on takeoff and can beat a stock agb-29 off the line but top end power is pretty bad the agb-29 would win then. The gear box is all down on the zhongshen motor and is not to bad at the start only bad thing is it goes in a circle so if you where riding flat out 4th gear and accidently went down you would probably flip off. The Exhaust on this bike is the worst exhaust i have ever seen it rattles and bangs people with an mxb I reccomend replacing this or the whole bike lol, the carby is 19mm i think and is not so good all tho the bike starts well and never had flat spots and started first kick with out the choke ever. Rating 30/100 Suspension and steering:The MXB had some generic Conventional Forks which are not very good for jumping or ditchs i bent a fork on my old MXB. The Rear Shock is very very poor it feels like a trampoline and is prone to breaking easily, On my mxb's shock when you lifted the back up the spring would move and you would have to hit it back into place, The front wheel is 14" and the rear is 12" the 14" front is not good for pot holes etc because it bends really easy and is also not very good for cornering, the mxb does not have a steering restrictor so if you turn to sharp you will most likely flip of, The stock bars are pretty thin and weak would reccomend replacing them with something like pro tapers my MXB did not come with a bar pad so if you bought tapes you would get one, the seat is not GRIPPY at all and is not a high foam one so i would reccomend replacing it. Rating 10/100 Braking:The MXB has front and rear disc brakes, the front works quite well for a cheap bike but the back on my MXB NEVER worked so i cant really say its performance. The brake lines where not braided at all unlike most other bikes. Rating: 10/100 accesories: The chain broke after 1st ride, the grips had plastics ends on them that broke off and cut my hands, the airfilter was the worst air filter you could get a non foam one and sucked dirt into the carby, the chain runner was hard plastic and would make a squeeking noise when riding. Rating 10/100 Overall: I would not buy one ever again they are the worst bike ever made they are not worth the money you pay for them you will easily spend double to fix them and then it will probably still break and they are NOT SAFE. Stuff that broke: the back brake (never worked from new) the grips had plastic ends that broke and cut my hands Chain stator plate and magneto cover throttle cable frayed Exhaust bolt snapped kill switch engine blew as the thorotle jammed and it woudnt kill becuase of the kill switch. the list goes on....... Reccomended Replacements: Frame, bars, grips, engine, suspension, rims, tyres, whole bike etc..... Picture: Thanks for reading, this is my opinion of this bike and im sure everyone on this site will aggree with me, and if i have left out anything or made a mistake please tell me.