Bershire, Mikuni setup

[socalmx]

I run a 30mm Mikuni on my 125 GS jug and it just sings...the best thing I did for the engine. You won't be disappointed.

[sixdazed]

Teddy,It's a large bodied 28mm (early style) and here's what i can read(with lighted magnifying glass!)5dp7 needle 2nd notch,O4 nozzle also has 190 stamped down towards the main on the nozzle(needle jet)as far as main and pilot go it's a guess as the numbers aren't really legible so it KINDA looks like a 210 main and a 35 pilot but i can't be sure and that's for sure!Hope this helps a little-looks like i'll be guessing a bit when i first get this together.I have other carbs to look at yet(i know i have at least 1 more mukuni for a 125)and i'll let you know how that comes out.
                                         Ric

ric emmal

[brian kirby]

New VM round slide Mikunis and old ones from the 70s are different internally so the jetting is not likely to be the same. It might get you into the ballpark, but be very careful on the first run that its not too lean.

Brian

'72 Six Day (on loan from Ernie P.)

[tlanders]

Mine is a new 30mm Mikuni and it sounds like the jetting is really  different. It runs fairly well with the 40 pilot, 250 main, P5 jet, 6F5 needle on second hole from top. Thanks for your help. I'll know Saturday how competitive it is against the Hodacrackers.

Teddy

[swamp fox]

Don't know if this will help any, but I remembered jotting down some stuff on Mikuni setups a while back.
This is what member Lindeman wrote to Rick/calif in '03.

 "The 28 makes great mid-range power and enhances this riding style.We all know smooth is fast!It also works much better for Hare Scrambles type riding.Anyway here is what works on my stk.125 with 28mm mikuni. Sea Level-165 main,60 Pilot,2.5 Slide,5EI4 Needle 2nd from top,Air screw 2 out.B8HS plug.In Denver area where I live 5500ft.I run a 155 Main,50 Pilot,Needle top.Good Luck!Dave"

 Now on my own 125 with the mikuni,my carb has these specs:
main-130, pilot-30, slide-1.0, needle-5d5 on the bottom slot(raised all the way up). It has 427 over 60 stamped on the side, with 34 on the spigot mount side. Spigot od is 34mm and id is 27mm. This is also at sea-level, or below, here in the lowcountry.
 Please take in mind that this was on the bike when I got it in '73, and I haven't run it except in the yard since Doug rebuilt it.

Man, I got to get my priorities straight.[8]



Robert Manucy
72 Berkshire
72 Six Day
82 Honda cr250r
04 BMW K 1200 GT