Posted by tylernt on March 17, 2007, 5:46 pm
I have an '81 Yamaha XS400 with dual Mikuni BS34 carbs. I cleaned the
carbs once before, but then could never get it to idle right. Had to
play with the choke to get it to idle normally, which I didn't want to
try to fiddle with while riding. So I'm at it again:
On the top of the carb where the diaphragm is, there is one hole for
the choke, and another hole for... ? What? Mine were plugged up with
crap, and I got some of it out to the point where I can see shiny
brass a little ways down. Are these holes supposed to flow air or
fuel, meaning I should continue my cleaning attempts, or is this just
a hole leftover from the casting/assembly process? If it's supposed to
flow something, why do I see brass a short ways down the hole?
Pic: http://i16.tinypic.com/432dtlw.jpg
Thanks...
Posted by FOG on March 17, 2007, 7:50 pm
>I have an '81 Yamaha XS400 with dual Mikuni BS34 carbs. I cleaned the
> carbs once before, but then could never get it to idle right. Had to
> play with the choke to get it to idle normally, which I didn't want to
> try to fiddle with while riding. So I'm at it again:
> On the top of the carb where the diaphragm is, there is one hole for
> the choke, and another hole for... ? What? Mine were plugged up with
> crap, and I got some of it out to the point where I can see shiny
> brass a little ways down. Are these holes supposed to flow air or
> fuel, meaning I should continue my cleaning attempts, or is this just
> a hole leftover from the casting/assembly process? If it's supposed to
> flow something, why do I see brass a short ways down the hole?
> Pic: http://i16.tinypic.com/432dtlw.jpg
> Thanks...
Does it idle now?.......... They sorta look like they should be there. Maybe
they are some sort of airbleed to allow the diaphram to move and crap in the
carb is always bad. Does it idle now?
Posted by tylernt on March 17, 2007, 8:40 pm
> Does it idle now?.......... They sorta look like they should be there. Maybe
> they are some sort of airbleed to allow the diaphram to move and crap in the
> carb is always bad. Does it idle now?
I wish I knew... my solar charger failed to keep the battery charged
while I had it stored for the winter. I have to find a way to get it
started now.
It's just one thing after another...
Posted by Dr Ivan D. Reid on March 18, 2007, 9:15 am
> I have an '81 Yamaha XS400 with dual Mikuni BS34 carbs. I cleaned the
> carbs once before, but then could never get it to idle right. Had to
> play with the choke to get it to idle normally, which I didn't want to
> try to fiddle with while riding. So I'm at it again:
> On the top of the carb where the diaphragm is, there is one hole for
> the choke, and another hole for... ? What? Mine were plugged up with
> crap, and I got some of it out to the point where I can see shiny
> brass a little ways down. Are these holes supposed to flow air or
> fuel, meaning I should continue my cleaning attempts, or is this just
> a hole leftover from the casting/assembly process? If it's supposed to
> flow something, why do I see brass a short ways down the hole?
> Pic: http://i16.tinypic.com/432dtlw.jpg
> Thanks...
Suggest you do some searching on the Mikuni USA website. There's
a .pdf manual there for their normal carbs, may also be one for CVs.
--
Ivan Reid, School of Engineering & Design, _____________ CMS Collaboration,
Brunel University. Ivan.Reid@[brunel.ac.uk|cern.ch] Room 40-1-B12, CERN
GSX600F, RG250WD "You Porsche. Me pass!" DoD #484 JKLO#003, 005
WP7# 3000 LC Unit #2368 (tinlc) UKMC#00009 BOTAFOT#16 UKRMMA#7 (Hon)
KotPT -- "for stupidity above and beyond the call of duty".
Posted by tylernt on March 18, 2007, 11:37 am
> Suggest you do some searching on the Mikuni USA website. There's
> a .pdf manual there for their normal carbs, may also be one for CVs.
I did find http://www.mikuni.com/fs-manuals.html , but I don't know
enough about carbs to tell which kinds are CV or what. I also found
http://i19.tinypic.com/3324bci.gif which was helpful in identifying
some of the other passages, but the mystery hole doesn't seem to be
called out in it. At first I thought it might be part of the starter
jet system, but when I blow compressed air in the little tube (not the
main jet, the other one with a hole in the side) that sticks down in
the flow bowl, air comes out the choke opening so I don't think that's
it.
Another thing I'm interested in is the pilot screw setting... but I'd
be happy just to have a bike that idles.
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> carbs once before, but then could never get it to idle right. Had to
> play with the choke to get it to idle normally, which I didn't want to
> try to fiddle with while riding. So I'm at it again:
> On the top of the carb where the diaphragm is, there is one hole for
> the choke, and another hole for... ? What? Mine were plugged up with
> crap, and I got some of it out to the point where I can see shiny
> brass a little ways down. Are these holes supposed to flow air or
> fuel, meaning I should continue my cleaning attempts, or is this just
> a hole leftover from the casting/assembly process? If it's supposed to
> flow something, why do I see brass a short ways down the hole?
> Pic: http://i16.tinypic.com/432dtlw.jpg
> Thanks...