Does anyone have the jet sizes for a gs500 with the mikuni vm34 carbs. Mine is running g really rich. I need. Good starting point. I bought the bike with the carbs on it already
it is in the wiki and other past threads
http://wiki.gstwins.com/
I looked in the wiki. But it only talks about the stock carbs. These are aftermarket mikuni vm34 carbs. I've tried contacting venders that sell the kits or some close but they won't tell me recommend jetting. I purchased the bike with these carbs on it. And it's way rich.
time to have fun or stop suffering, you decide...
open them, look for the jet number you haver now and order more sizes.
vm34 is 2 circuit?
needle with ridges to adjust height?
i would aim at similarnumbers as stock gs 1st gen carb.
pilot 40 main around 120-130 maybe
and also, you may only need to lower the needle, or tune it on pilot mixture.
tweak first it to extract info and understand where you are richer,
jet sizes, needle code/profile and needle height
there is better info but roughly
piolt idle -1/8th throttle
needle height +main jet - 1/8th to 3/4th
mainjet 3/4th to WOT
I opened them. Have 40 pilot and 260 main. I added a wide band three full turns out and I'm at 12.5 afr. Waiting on smaller pilot jets. I have 240-310 mains but I feel I'll need a lot smaller. I'm going to find a local shop that has a dyno so I can run it under load and correct my wife open aft. Then focus on the needle
From this video (https://www.youtube.com/watch?v=67Nb3DI-B3s) the yamaha xs650 with vm34 carbs uses a main jet from 180 to 220 so you will definitely need smaller mains.
how did you installed a wide band ? which one?
for pilot jet i would aim to 3 turns out.
A pair of ORIGINAL carbs with correct original jetting will probably be cheaper and easier to find than trying to chase the right settings with your non-standard Mikukis.
Hey there Reed, did you ever get these carbs sorted?
I had VM33 smoothbores on my 900, so 225cc per cylinder
it used the old-style larger main jets. My working range was 140-150