Mikuni TMX jetting database

[250r rider 88]

i know there a few others out there using the Mikuni carbs we need to come together to get a jetting database going cause im still not happy with my jetting so post your setup and how its working for you

ESR TRX 6 pipe
K and N no lid, outerwear
low-mid C-Leigh port 263cc (68.0 mm piston)
TMX 36mm carb
430 main
25 pilot
needle clip in middle
Boyeson Rad vavle

elevation is 500-1000 ft above sea level


whats everyone else running?

[mxduner]

go to esr's web site, they got a baseline.

this is what i got from what i can remember
esr 310 (72mm) 292cc apr.
c-leigh mx port
rad valve
pt 89 race
170 psi dome???
um airbox, k/n ,outerwears
800ft. s/l
70 degrees
36 tmx
main: 370 hair rich
360 hair lean
4th clip hair lean
3rd way rich(gonna add shims on 4th)
27 pilot
a/s 1 7/8 out

hope that helps...all i remember clearly except the clip position, i listed 3rd and 4th but its been so long and its winter where i'm at so i am getting out of the loop.It could've actually been 4th and 5th(top) but i don't want to send you to far lean.good luck i got mine to work great...thing rips

[250r rider 88]

this is what ESR has for the Mikuni carbs as a starting point
36 and 38 Mikuni TMX

250-265cc
main 360-400
pilot 25
needle 3rd clip
air screw 2 turns out


310-330cc
main 380-420
pilot 25
needle 3rd clip
air screw 2 turns out


350-370cc
main 420-460
pilot 25
needle 3rd clip
air screw 2 turns out

so im running way on the rich side it seems but the only thing i need to change is the main jet but thats not going to really help my low-mid range is it?