lifain 125cc in z50 problems ASAP

[pitpro17]

hey have a z50 which we just fitted a lifian 125cc engine into using a 110 wiring harness all pug work have spark engine fires and idles fine revs fine
but when you put it into gear dies on you

could this be because using the smaller 110cc carby?
carby tuned wrong?
cluch?
or the wiring harness is wrong to suit for this engine /but all pugs fit and we have spark?

any help wanted asap

 

[eichkay]

hey have a z50 which we just fitted a lifian 125cc engine into using a 110 wiring harness all pug work have spark engine fires and idles fine revs fine
but when you put it into gear dies on you

could this be because using the smaller 110cc carby?
carby tuned wrong?
cluch?
or the wiring harness is wrong to suit for this engine /but all pugs fit and we have spark?

any help wanted asap

Give the carbi a clean, the float is probly sticking and not letting enuff fuel in.

 

[jwe97015]

swap the plug my boys bike was doing the same thing it was the spark plug he was gettn spark but not properly i could b wrong

 

[Sidney]

It's probably not the spark since the motors are only 14cc difference.

Does the bike attempt to roll forward and then it dies?