i need intial set up for mikuni carb air/fuel/idle

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frankovy
Posts: 37
Joined: Sat Apr 16, 2005 2:19 pm

i need intial set up for mikuni carb air/fuel/idle

#1

Post by frankovy » Thu Aug 10, 2006 3:16 am

anybody have experience with the intial carb set up for mikuni air/fuel/idle bike started second kick at high rpm for 10 seconds then died
unable to start now. help will be greatly appreciated.
frank in canada



mbskeam
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#2

Post by mbskeam » Sat Aug 12, 2006 5:31 am

what carb?
38 VM?

this is on a 88"
vm38, I have a 35 idle and a 330 main, all the other parts are stock, as in what came with the carb.
I also run the needle at the highest clip setting, (the C-clip is in the groove at the top).this will make it run rich or lean at 1/8 to 1/3 throttle, I moved it 2 slots and it ran rich so it went back to what I have run for years, this will fine tune it
I also drilled out the fixed choke jet from .025 to .038, as it was not getting fuel that it needed to start a cold 88", there is a small air port in the bowl that I think I will plug to see if it will draw more fuel on choke, kinda like a miki 42 flat slide, these just draw straight up from the fuel bowl with no air vent, and it starts a 95" up real nice all the way into the teens


on my 74" I had a 25 idle and a 280 main, needle is the same as above.
the choke supply worked like it came set up with. .025 jet
also make sure you have no intake leaks.......

mbskeam

mbskeam
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#3

Post by mbskeam » Sat Aug 12, 2006 5:39 am

oh.........
the air fuel screw, start at 1-1/2 turns out.
if its less then 1 turn you need a bigger idle jet and if its more than 2-1/2 turns you need a smaller idle jet.
mine ends up at 1-1/2 to 2 turns
mbskeam

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