motors problems

[spidy]

hay aj build a ty4 motors 2.1 and my problem is the motor hew now power.
when aj pus the gas in 1.2and ger to the limit hes sheiking and aj mast sot dawn the motor and then is vorking normal.a dont now what is this.aj hew a elek.start.motor dont hew the power for 2,1ccm aj dont now whay.if sombady now what is the problem plis help my.aj need help.motor is new 10 000km
ajm from slovenia and aj bild the speedstar kabrio