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It is a little bit scrappy down low

Hi a have a gpx125 Race engine the engine is straight out of the box, I recently brought a oko flatslide 26mm carby from dhz to replace my piece of junk mikuni 26 roundslide and the oko flatslide standard jets are 36 slow jet and 102 main, and It will only start when the choke is on but when...

How much would I be looking to get it done at a shop??

Is port work hard to do?

Does any1 have 1 of these engines and what performance modifications are there to make them go harder??