Balancing Carburettors with home made manometer

Balancing/Syncing the carbs on my '90 suzuki across gsx250f.

A run down on what the manometer is made from and how it works, plus a rather length demonstration on it working.

As you can tell its ultra sensitive. the adjustments were all less than 1/32nd of a turn.

Excuse my terrible commentating. Thats impromptu video'ing for you :D

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Автор Timosbi (1 месяц)
just got a virago 400 did your manometer trick with two coffee jars. it
worked perfect! it was easy. Thank you 

Автор stephane talbi (4 месяца)
Thank you for the carb sync. tool, I did do one exactlely the same and used
it on my v-star, works just perfect, I'll keep this precious diy Tools and
show it to my buddys
Thanks for your help Steven

Автор L2fish (3 месяца)
i had a spearco water injection system on a camaro. they got it from the
ww2 aircraft

Автор HeavyHitter5150 (2 года)
So in which order do you sync. them? Both outside then both inside? Or is
there a manufacturer recommendation for each bike?

Автор sirhaggardly (1 год)
Hey this looks like a great design for a homemade manometer - no issues of
the fluid getting sucked into the cylinder. However he water vapour that is
being sucked into the cylinder is going to affect how the fuel burns,
essentially changing your air/fuel mixture. You'd probably get closer by
using oil instead of water.

Автор Jason Pollmann (8 месяцев)
My thinking is both throttle plates at sync will be at their stops, lowest
RPM. As the screw is turned, one opens from its stop, raising the RPM.

Автор superchase08 (2 года)
What screw do you adjust to balance them??

Автор jimmy Forero (10 месяцев)

Автор redneckhippiefreak (10 месяцев)
Water is used to clean the head and valves and in some cases adds power..
no harm just a lot of back fires and sputtering if not atomized correctly..
The old spitfire planes got that name from the WATER injection system that
added lots of horse power. " Push the button and climb like a wild cat" was
an expression I've heard when relating to these systems.

Автор Dogastrophe (11 месяцев)
I wish I could draw this for you ... may make more sense. Each stopper has
two holes - for the tubing that you are going to run to the carbs, push in
just far enough clear the stopper. Connect the two bottles by making an
upside down "U" with another piece of tubing - this piece goes down into
the bottle (~3/4+/- of way). You will want your set up to be air tight so
check stopper in bottle and tubing in stopper (and tubing onto carbs). Hope
this made sense. Cheers

Автор michor10 (1 год)
I have no idea why I just sat here watching two bottles for almost nine
friggin minutes, man! That's insane. Hypnotizing even.

Автор Bogdan Comanescu (1 год)
1 with 2, 3 with 4 and then 2 and 3...for all 4 carb. bikes!

Автор Chill Will (1 год)
if you held the throttle at 2k it would probably level perfect. That bike
sounds GOOD. Nice video.

Автор ThrasherGnar (10 месяцев)
moron lol

Автор David OToole (10 месяцев)
Agree with RedNeckHippie.

Автор HyzerGlen (2 года)
@sackcheck Yep! Its a suzuki across which is pretty popular around here.
The fuel tank is under the seat / over the rear wheel and where the tank
normally goes is actually a storage compartment So the batteries plonked up
on top there. Have a look on google (suzuki across / gsx250f) Its pretty
cool :)

Автор HyzerGlen (1 год)
Cool! I'm doing a yamaha zeal at the moment so i'll have a new vid up in
the next week or so :) its much harder than the across so hopefully a bit
more applicable for most people. The across is a piece of cake the balance!
good luck. They run so much better for it :)

Автор HyzerGlen (2 года)
@buddha65281 Hey thanks for the comment! Yeah totally buying the right tool
is the way to go, but hey, jobless and penniless for now so desperate times
as they say :P Two quick things tho (had a huge reply but youtube ate it
lol) this is mainly intended for 250s and cheap clapped out bikes we have
to stay on in aus under LAMS laws plus with this method you can't suck up
fluid, cause the total volume of fluid even in one bottle still doesnt
reach the tube to the carb if you get what i mean!

Автор Théry S. (1 год)
I tried this method on my 1985 Kawasaki 600R and it worked just fine. Got
the four carbs synced in 5 minutes. Thank's for sharing this vid !

Автор David OToole (10 месяцев)
Concerns about fluid getting sucked into engine. Only use sufficient fluid
or position the tubes so that when one is nearing the top the level of the
other falls below the tube (and is then sucking on air). Tape them or
fasten them to a board or box so theat they can't fall over. Elsewhere
people have questioned the use of water and suggested petrol.. DON'T. It is
NOT the nature of the fluid water/oil but the incompressability of fluids
which will cause problems in any case.

Автор Jay B (1 год)
Very clever... : )

Автор Smalls62 (1 год)
that, sir, is impressively resourceful.

Автор Steve McEntee (2 года)
Thanks, this worked a treat on my Kawasaki gpz 500s/Ninga500r.

Автор HyzerGlen (1 год)
Sounds about right. I have gotten 200k out of a tank but that was bone dead
empty, and only achieved by filling the tank to about 20mm below the top of
the filler neck and running it in 6th gear everywhere :P They are a heavy
bike for a 250 so they will never be as efficient as the others.

Автор TheStinger30 (1 год)
cool, thanks for the feedback

Автор Kyle Baker (1 год)
It actually varies. On my '82 yamaha inline 4 (xj650), you start with 3,
then sync 4 to 3, then 2 to 4, then 1 to 2--if I remember right! Looking to
do this procedure myself soon. Did a 'bench sync' and that's the order I
used then.

Автор daveo138 (1 год)
Great idea, thanks, but it wasn't clear at the beginning that the tubes
from the carbs only go into the very top of the bottle and it's the balance
tube between the bottles that is under water. Soon worked it out though.

Автор davnroxie (11 месяцев)
Absolutely brilliant! I have a 75cb750 That I have had for years and I know
the carbs need synced. I can't wait to try this!!!

Автор Jerrold Adler (11 месяцев)
Here's a tip for making this setup a little safer: Don't use water, which
will suck water vapor into the carb (changing the mixture) or suck actual
WATER into the carb if the bottles get tipped over (you don't want that).
Instead, use Marvel Mystery Oil or a similar oil-based additive. One: It's
red, which is good for visibility. Two: if it gets somehow sucked into the
engine, it won't hurt anything! It'll just burn with the fuel, maybe smoke
a bit.

Автор PeaceLoveandMusic04 (1 год)
good video helps with figuring this stuff out

Автор stephane talbi (1 год)
just tune my carbs on my v-star 1100, work just fantastic, reusable and
inexpensive yet costless,thank you HyzerGlen

Автор TheStinger30 (1 год)
HyzerGlen, mate im eagerly awaiting to see a new video on this, i intend to
ballance my suzuki across in the next few weeks. i might even make a video
of it myself for youtube

Автор Ruskinrowe12 (2 года)
The air bypass screw to balance or the throttle stop screw? My take was set
the throttle stop screw both to the same, then adjust the air bypass screw
toile bike run about 1000rpm, then balance by adjusting air bypass screw.
Is this right? Or can you do a video showing the carby end? Thanks.

Автор HyzerGlen (2 года)
None of the above :) There are three screws in this particular bike. 1) The
air/fuel screw is set to whatever the manual says. You should rarely need
to adjust this. 2) The throttle stop. I set it a bit above idle for the
procedure. 3) The balance screws - they sit between the bank of carbs,
which is what i am adjusting throughout the vid. On most other 4cyl bikes
there will be 3 of them. On this bike, only 1. Will definitely be doing a
new and more clear video shortly :) thanks!

Автор Brenton Telford (11 месяцев)
Thanks Dogastrophe, I ended up figuring that out and making the design
successfully but does he change the mixture screws or the balance screw? I
ended up bench balancing the carbies (taking them off and using a needle to
adjust the butterflies to open at the same time) and the bike runs much
better and kets an extra 20km's per tank..Is there a way to use this method
with the manometer to adjust the mixture screws or is it just for the

Автор martythefrenchie (1 год)
on a 4cyl carb number one is the baseline carb. hence its not adjustable so
the other 3 need to be balanced with it.

Автор phxxr650r (10 месяцев)
hold the camera still

Автор buddha65281 (2 года)
Hey guys, this is a great idea but just go buy a set of "Carbtune" syncs...
I did and they are not expensive. I know know this bike but normaly the
carbs SUCK the fluid up according to the vacum. I would not want to suck up
any fluid into my Hayabusa carbs. Just my little .02.. did enjoy the video
though! You are right I have not met a bad person from down under yet...
props to Australia!

Автор sackcheck (2 года)
wow your battery sits on top of the engine

Автор HyzerGlen (2 года)
In a 4 cyl bike with 4x carbs, I believe you sync the outside 2x carbs with
each other then sync those two pairs with each other. :)

Автор TheStinger30 (1 год)
cool, thanks for the feedback. also im getting about 172kilometers from my
maintank before it runs dry and i need to flick to reserve.i have seen some
say they get about 200 kays out of the across.do you have any idea what the
norm is for the across for fuel mileage?im stil wating on my manometer to
get here from the usa.cant for it

Автор billys TA (2 года)
this water is inside the bottles???

Автор rwc297 (2 года)
VERY helpful video! you just saved me about 400.oo dollars u.s. by not
having to take my shadow vt700 to the shop? kinda funny in that the last
time i needed help with a diesel genset a man from australia helped me.
nice people down there!

Автор fabi saavedra (1 год)
donde van conectadas las mangueras es en la entrada del combustible o en el
drenaje gracias

Автор Théry S. (1 год)
On my old Kawa , the throttle cables come from the center so the 2 center
carbs are synced first , then you sync the two left and next the the two
right together. I guess it depends how the bike is made.

Автор michael fallows (1 год)
hi should i be using glass bottles as im using plastic and they are
collapsing as i start up thannks mick

Автор Brenton Telford (1 год)
Hi I watched this and could not see where the pipes went and ended up doing
it wrong, I shall reattempt but. (I have a 98 across) is it that the hoses
go from the vaccum part to into the bottle? the pipe does not go into the
water does it? does the top of the bottles have to be sealed or can the
pipes just dangle in there? there is a pipe that goes from 1 bottle into
the other (is that in the water?) Please reply

Автор Brenton Telford (11 месяцев)
I have set my mixture screws to the recomended setting then i played around
with that til the bike felt the most powerful

Автор TheStinger30 (1 год)
i ballanced my carbs in my across this arvo. i bought a "motionpro carb
tuner" took about 20 minutes all up to get the job done from start to
finish. thanks for the video.see how it goes now and if it uses any
less.more fuel.

Автор David OToole (10 месяцев)
Two comments: As far as I can see the carburretors will be balanced when
the level is UNCHANGING (indicating that the pressure above each fluid is
the same). NOT when the fluids are at the same level. HyzerGlen says this
but it is easy to miss. Also - He says that when they are in sync the revs
DROP to their lowest level. This can't logically be right. When they are in
sync they will work better together. Shouldn't the revs rise? Not a good
explanation of how to make it but still very useful

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