lifan 125 carby on yx 140

[funfisher]

Hi guys, just wondering, i have a carby of a lifan 125 that always seemed to supply too much fuel to the 125 but was wondering if this carby would go ok on a yx 140, the old carby ( off the lifan) is a mikuni, all the things i read when i bought the lifan, ( in a dhz 125 2011 mod) says it a 26mm but the carby on the new yw140 looks heaps bigger. As i have said before i am having trouble with the yx140 running rough at about 1/4 throttle under load, i have done the valves, set them at 3thou inlet and 4 thou outlet, when i did them the inlet valve was a lot closer then 3 thou, thought that may have been the issue but it still does it, not as bad but still there.
Cheers

 

[my67xr]

have you compared the 2x carbys from the intake mainifold side?

what carby is on the yx at the moment?

the China Mikuni will work with the 140, may need rejetting though?

 

[my67xr]

have you tried jetting the YX140 original carby?
http://tboltusa.com/store/tech.php?pID=61/Simple+Guide+to+Jetting