86 yz 250 carb

[helfrick15205]

i just put a new vm 38mm carb on my 86 yz 250. every thing inside is 1 step leaner than the stock carb (main, needle, ect.). it has a lever choke on it and i dont know what position the lever has to be in for the choke to be on. i started it with the lever down which i think is the choke on and it ran fine and every time i pulled it up it bogged and wanted to die. am i correct in assuming that it is running to lean? i have the old carb and can change out every thing except the slide and needle.

[evo550]

Yep,
sounds lean to me.

[mxaniac]

Lever down is choke on for the VM.  Bog without cleanout is lean, bogging and then cleaning out is rich.  I would look for air leaks too, some bikes from the 80s needed to be jet several sizes leaner than stock.