bs34's

I have a set of bs34's that came off of a 1980kz1000 they are shiny silver in color and the holes around the mouth of the carbs don't have screw in type air jets or whatever they are called. The caps are more squarish than some other style bs34's I've seen. The slides have a round donut shaped piece of plastic that goes on top the non adjustable needles. The choke is a pull out type and I think they have 122 mains in them. Are they good carbs to use for a 1015cc motor? Are the jets in the mouth of the carbs changeable? What needle should be in them? Are these even for a 1000? I saw the bike they came off of and it was a j head kz1000 ltd. Nice shape. I had a set of keihins that had 122 mains so I'm wondering if these carbs originally came off a 750 or do the mikunis have different jet calibration.? I just bought these carbs for 100.00 and they came with like new intake manifolds. I had to drive 300 miles but maybe it was worth it. The first trip netted me a set of keihins for a 750 and that was 90 miles. Hope I'm square now and have something I can work with. The guy had another set of bs 34's looked more like what I've seen around but one bowl was missing. He said he would trade if I wanted to later.

I just bought an 81 ltd w/ those 34 carbs and the 122 is the stock main jet. I'm looking at installing the 127 main along w/ the adjustable needles that came with the standard J model 1000 of that same year. I just joined this forum and llok forward to alot of good reading.!!

Thanks for the reply! I just saw the same carbs on ebay sold for 150.00.

Mine are like new and I'm in the process of drillling the mains to 145, (harbor freight has a neat little package of variety bits, most will fit many jet sizes or inbetween.

Just wondering about the stock needles now ... is there a better needle or these ok?

I'm on my way! :woohoo: :evil: :whistle:

If you drill them to a 145 the engine will not have any top end. It will be WAY to rich. I run #135s on a 1150 motor with oversize valves and .420 lift cams and I am just right on the 135s. How do you know it will be 145? The # represents cc of fuel flow/Min. There is now way for you to know what the fuel flow will be once you drill them unless you test them after drilling.

I printed a chart 1/1000in to mm.

I used a 1/16 bit and that was 1.55mm. (For my carbs)

The bit I selected from the 30 peice set is .057 and 1.45mm.

.053 is 1.35mm.
.044 is 1.12mm.

and on down to pilot jet sizes, .013 is .33mm .015 is .38mm.

You can drill any size as mikuni did. The 1.55mm jet I have been running is too rich but the power up top seems strong. Common sense tells me to go down, but little. So 1.35, 1.40, 1.42, 1.44?

Whatever it takes, but I need to see the emulsion tube and compare holes, If the bs has larger holes in the tube then it's recall! :woohoo: Thought you said you ran a 1.42mm? That toy buzz box you call a bike can't eat fuel like like a motor will if you let it breath and pull air w velocity at high rpms. :whistle: You lose your signal from the 105lc way to early. So in other words, I'm trying to make something that will burn some fuel. That's part of the equation, to make more wheel turning power... I don't like people beating up on me, so I have to take my little 1015 to the top. Do the factory needles need shimmed to richen the midrange?
Ram air?

LIttle jhonny Bravo was trailing behind, his minni bike clanking and banging, face red from intense alcohol buzz and pizza stuffing at Susi's lounge... not to mention the sun...

Dave's bike continues to overheat, three oil pumps and 10g synthetic later the constant, ongoing thermal breakdown of his motor plaques him. What did I do to deserve this? It just doesn't make sense. He can't figure out why all the problems since he has an oil cooler.
And fittings cooler than the Fonze. Sweat rolls down his face as he looks down to the freon tanks, he swears he sees a bulge and every gauge is through the roof. What bothers him is that he is not really emission compliant this time. The vibration is really getting him down. It's another bearing he just knows it. What he don't know is plummen was impressing the lady' and old blue had to stay in the corral, so he jumps on Dave's bike and burns three quarters of his tire off while he's in taking a crap. The mushrooms he slipped into his drink would keep him far from his back tire. :whistle:

Plummen was left behind, drank too much whisky, started racing himself back and forth down the highway in a 50yd stretch. That was 8 hours ago. Probly comes back with a bunch of weed strapped onto his 8gallon keg again, swearing up and down it's better stuff.

Nads yawns as he lets off the throttle, the speedometer descending from 150mph.

Where are those turkeys he wonders? Time to slow down and wait, he shuts off the engine and dreads the fatful group of low rpm tractor creatures arrival at the next bar. Plummens sure to start another fight knowing Jhonny's around the corner, dave keeps falling in love women of all sort of double wide garages and beach front ... Smelling like scorched oil and sweat he attracts anything over 220lbs like a magnet,

night time comes Jhonnys zipper's broke from showing it to every women he sees all night,
The fat lady's past out on her chair, plummens past out in her cleavage he gurgles in the vomit trapped in her bra so you can't realy tell it's a snore....

After I shower, eat breakfast, then get some food, it's on down to the corral to round up the herd and make the best the day.

I'll start with 135's and work up from there. But if needs more gas ...

every time I read one of ur posts i think of Oddball from the movie Kelly's Heroes

Ahhhhh.... drilling out the old jets again I see

You can drill,
You can fill it,
You can jam it with a fork,

You and grind it,
You can bind it,
You seal it with a cork,

Get it right - be happy
Get it wrong - it's PORK [as in..oink - oink] :evil:

jonnybravo wrote: every time I read one of ur posts i think of Oddball from the movie Kelly's Heroes

Woof woof!

BBQ Pork anyone.... :whistle: :evil:

cavanaughracing wrote: Ahhhhh.... drilling out the old jets again I see

You can drill,
You can fill it,
You can jam it with a fork,

You and grind it,
You can bind it,
You seal it with a cork,

Get it right - be happy
Get it wrong - it's PORK [as in..oink - oink] :evil:

I can't see 145 as being too rich. I used 1.55 before and the needle jets are not going to effect the size of the main.

I might have to mess with the needle if the midrange isn't right. Or change main jet if it is right.

I'm going to build a small box for the carbs. I want the slide action to be fast so I can determine fuel demand.

After that I'm either gonna like um or make me an anchor. Keihins aren't that far away with some saving.

I want that quarter speed.

I listened to a long post between wiregeorge and someone .. alll about bs 34's. And here I thought the guy didn't share information. He has shared everything he knows many times over.

The shiny new bs34's sit on the counter. Looking at them as I insert the drill bit, I worry about the coffee I drank. Once and for all I'm going to prove to society that I AM.

The bare wired of the drill keep pulling out of the outlet.

Oh well

That's right, kicked the breaker last time.

BULLETIN: the flow has been interupped!

The wildabeasts are stirred up and turning circles!

They don't know if it's a drop off or a water hole..

The tide is rising!

hERE COMES THE GAS!

Open the bs 34's!

Let the wave begin!

arf arf arrroooooooo!







And everyone elses.

Kinda makes ya feel like home

We all flew over the Cuckoos Nest.Nads lives in the Cuckoos Nest-a permanent if somewhat recalcitrant resident.
You can drill it,
You can twist it,
You can beat it on the wall.

You can polish it,
You can scuff it,
You can show it to us all.

But when the smoke has cleared,
And the motors cease to moan,
Your bike will be the one,
Thats back there all alone.