Help with bore kit issue

Hi guy iv recently got a 150cc bore kit for my lexmoto dart 125 the place I got it from says it fits my bike bla bla the engine code is 152qmi-a and the bore kit matches the engine code yet seems it does not fit here is. Pic of it hope some one can help thanks

 

When you say it doesn't fit is it simply to big for the frame?

 

The cylinder don’t seem to fit right

 

Measure the spigot diameter (bottom of barrel) then mouth of cases, the cases may need machining out. I did it with a 150cc kit on a CG 125 engine.

 

Is that all the way down to the case?

 

Contacted the seller and apparently there is 2 engines for my model bike and I have the newer one so don’t fit