Kawasaki Zephyr Rough Running

snip

Come to think of it you are correct. The only times I've heard of
gummed carbs was motorcycles in warmer climates or not ridden
regularly.

yeah, but it isn't surprising. It's the only experience he has.

 

LOL then you must not ride. Riding season you wouldn't know what that
means sitting on your lard butt in california. Try living in a fun
place like seattle or the high line of montana. Hell shit hole states
like vermont or kansas for that matter. One would have to be in the
northern third of cali' to need or have "riding seasons"

So bullshit you geritic, racist lying POS. I've btdt in Cali' on your
tax dollars you felcher. Even in the Mojavi there is no need to park
except for food, fuel, sleep and a hot horny waitress (something you
couldn't understand))

So tell me oh great uninformed wiki warrior...are you fooling your
self or lying to everbody else

 

uh, bullshit and outright lies.

It do to work, though you don't use a 750 Holley. SO pop us another
lie chickenhawk junky.

 

I was wondering about this myself, but I really have no experience of
four-barrel carbs, so decided to keep schtum.

Of course, twin-barrel carbs have been fitted to Japanese inline fours
as OE. But the four-barrel seems to be a uniquely American product.

(says the man who *still* hankers after a rumbling V8 musclecar)

 

Name one. I remember Kawasaki used dual throat carbs on their 1300cc
six cylinder model in the 1980's.

Four barrel carbs typically had two smaller throats for economy and
two larger throats for power. When all four throats opened, it was
like flushing gasoline (and $$$ ) down a toilet as vacuum suddenly
dropped off and the
accelerator pumps squirted extra fuel in to make up for the lack of
suction.

Some NASCAR tuners take advantage of the fact that fuel droplets
condense onto the bottom of the manifold plenum chamber and they use
that puddle of gasoline as a reservoir to help accelerate off of
slower corners...

How primitive can they get?

The four barrel carburetor dumps into a plenum chamber where there
isn't much air velocity. Then the air has to speed up again through
the intake runners and the ports.

There's an ideal airflow velocity of around 250~400 feet per second in
the ports.

Harley Davidson's VR1000 road racer's intake ports were designed by
Roush, a NASCAR engine specialists and the ports were too large. The
intake velocity was only about 220 feet per second, and the fuel
injection system couldn't overcome to low velocity.

Two single throat carbs or one dual throat carb probably would have
been competitive at all...

Cylinder head porting specialists grind ports to a certain size in
cc's.

They are well aware that they can get away with larger ports if the
intended application is constant wide open running on a high speed
oval track.

But they will make the ports smaller for a car used on road courses
where the engine has to pull smoothly from lower RPM off of slow
corners.

I've seen pictures of a small bore DOHC Italian engine used in a small
GP car of the 1950's (it was around 750~1000cc, an OSCA or a Fiat
Abarth) with 45mm Weber dual choke carbs on it.

Japanese carburetor companies like Keihin build carbs for I-4's that
are as large as 40mm and they make 42mm carbs for Harleys.

That's about as big a carb as you can put on a single cylinder with a
displacement of around 45 cubic inches, then you run into problems
with
low intake port velocities when the throttle is wide open.

You look at pictures of Carroll Shelby's GT350 Mustangs and CanAm cars
of the early 1960's and what you'll see is four Weber 45mm dual choke
carbs sitting on top of the engine.

350 cubic inches divided by 8 = 43.75 cubic inches...

 

Do you *really* want to be made to look foolish again, with these
silly challenges of yours? No, you go and have a hunt around.

<snip the usual irrelevancy>

 

I won't pick up your rattle again.

 

You don't actually understand what 'throwing the rattle' means, do
you?

Found which Jap four used twin-barrel carbs yet? I bet you've been
hunting....

 

The immeadiate one that came to mind was a 2.0L chevy with a 4bbl. I
think it was over carburated. Would have done better with 2bbl massged
to 500cfm. 8^) Many of the old GL1000 have had 4bbl, 2bbl and even
2x2bbl conversions. One thing I'll give the chopper crowd where there
is a will there is a way and frankly dang near anything is possible if
you are willing to do the work.

Why? No brakes, Handles like drunk pig on ice and uninspiring
interiors. No thanks, not for me. I'd rather a MG midget with an
upgraded suspension and a nice dual over head camed 2.0l mother fed
with nice modern FI setup like the GSXR1000 sports. Definatley have to
have a magneto ignition. Radio? Who needs it? Colour? Racing green
duh.

 

Yes. You're really tempting me now

Might as well buy a Mazda MX5. Er, Miata, to you.

Troo. I hardly ever listen to music in my car. That's a lifetime of
riding bikes as conditioning, I suppose.

Is there any other colour, except Italian Racing Red?

 

Yeah BUT you can't get five strong friends to help you park it by
lifing it into a parking space. 8^) the MX5 is slightly more portly
iirc ymmv.

Red? RED? Red looks fast, Black is fast. But green goes by so quick
radar can't see you. 8^)

 

Excuse me. My Ducati is actually white. But due to the light doppler
shift when it's flat out, it actually looks red

 

in the late 70s I had a merc. capri with a 2.0 built that I had a
holley 390 cfm 4BB on, also had it on some 2.3 pintos. that set up ran
great. 1900 lbs car, beat many a 350 camaro, anywhere but top end. but
then I was killing Kaw 900s with my 750 honda too. KB

 

Schiffner wrote:
....

Nothing wrong with that IYAM. For quite some time, BMW cars had no
coffee cup holders, now they've succumbed to the foolish market.. Even
though I'm not a race driver, I couldn't argue with keeping those out of
4-wheelers. I thought it was okay for the 1960's Alfa-Romeo's to have
tthat clever fag lighter that you inserted the cigarette into rather
than have to remove the device from the dashboard. This might be why I
like clutch-handle-less two-wheelers. There used to be, maybe still, a
1950's mainframe computer, Univac or somesuch, in Washington DC's
Smithsonian museum that had the conventional cigarette lighter built
into the console, Alfa Romeo could possibly have built a computer that
didn']t require its operator to pause while typing.

 

You can't see it so how could you tell? Anyway Duc's all turn black
once you get them up to their top potential speed...something about
the paint I suspect.

Whereas if you are on Honda's they turn white....so the police wont
notice you. Not that I've tested this...with one paint failure due to
dirt altering the color to a dull brown. ;^)

 

I think more than a few of the old Opel GT's had that and similar done
to them. Not a cage fan BUT I find it kinda sad the only time I see
one of those is at a drag strip witha bloated V8. A real shame imo,
shouldn't happen to a cage.

 

LOL IYAM the you don't need power steering ever on any cage. I still
don't get cup holders even though I've used them. Make the cockpit of
the cage PROPERLY and you can hold the cup between your legs, thus
keeping the boys warm until the heater starts working OR on hot days
cool until the AC cools the cockpit. 8^) Trust me on a 110F day that
cold drink is a comfort when you have either cloth, leather OR vinyl
seats.

As for your cigarette lighters in cars a zippo is more reliable.

 

The ones I've seen were all tube frame cars. ;^) Thus all new wiring.
I've had what technically was a 4dr muscle car. Under the sheetmetal
it was basicly a 1978 Trans Am from the firewall forward. Yep, I hadz
a cops carz! Cop motor, cop transmission, cop wheels, cop steering,
cop doughnut stains on the seats and drunk stains in back. That 6.6L
could actually do damn good on back roads made of anything but asphalt
or concrete.

p.s. the only mods I made were to suspension and steering...square
corners were easy.

 

And another thread turns into a steaming pile of who gives a dead
rat's ass...