34mm Mikuni on 79 Et250 low end bog

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mike_donison

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Feb 17, 2016
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15
Location
Regina
Hey guys just as the title says. I have installed a 34 mm mikuni on my 250 Enticer. Fired it up last night and it idles pretty good. There is a low end bog when you hit the throttle. Once you get past the bog by feathering the throttle it revs up great. I'll have to check everything to confirm what I put in for main and pilot jets, needle jet and jet needle. But just to get started what should a guy do to kinda narrow down the issue?
 

let us know the jetting first but sounds like pilot is too small or the slide is too lean .... . while i have not done the conversion i would start with
2.5 slide 40 pilot Q-0 tube 6DH4 needle set 3rd clip with 320 ish main yamahas tend to like alot of fuel on the bottom end and one step larger main on top giving a little rich plug reading
 
Alright so I pulled everything apart and here is what I had ordered to put in to start with
Main 220
Pilot 30
0-6 needle jet
6dh7 needle (third clip from the top)
Let me know what you guys think.
Oh and idle screw out 4.75 turns.
 
Last edited:
So it sounds like I need to start over. 2.5 slide i believe. My next attempt was
220 main
30 pilot
159 o0 needle jet
6dh7 needle
A few guys have posted this set up.
 
Yamaha Nutz said:
let us know the jetting first but sounds like pilot is too small or the slide is too lean .... . while i have not done the conversion i would start with
2.5 slide 40 pilot Q-0 tube 6DH4 needle set 3rd clip with 320 ish main yamahas tend to like alot of fuel on the bottom end and one step larger main on top giving a little rich plug reading
Click to expand...

from the beginning of the thread
 
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