DIY Carburetor Synchronize / Balance Tool
This is a homemade bottle style carburetor synchronization tool ( homemade
manometer ) and balancing tool. If you are going to attempt to, or want to
know how to sync your carburetors, there are a few things to know first.
1. Carburetor Synchronization = Adjusting your carburetor throttle plates
or throttle slides so they move from your carburetors idle setting to wide
open throttle simultaneously, or in sync with each other.
2. Balancing Carburetors = Adjusting your carburetors so they allow each
cylinder to flow or pull the same amount of air and fuel at your desired
idle speed. Carburetor sync and carburetor balancing go hand in hand.
3. Idle speed screw adjustments must be made at normal operation
4. Air fuel mixture screw adjustments must be made at normal operating
5. Air fuel mixture adjustments only affect your carburetors pilot circuit,
which means from idle to part throttle. Air fuel mixture screw adjustments
have zero effect on wide open throttle.
6. Carburetor running rich = Too much gas not enough air.
Carburetor running lean = Too much air not enough gas.
7. Wide open throttle rich or lean conditions are adjusted two ways:
A. Carburetors with throttle slides have a clip on the carburetor main
jet needle. Raising the main jet needle clip drops the needle deeper into
the main jet and will lean the carburetor out. Lowering the main jet needle
clip will raise the needle and enrich your carburetors mix.
B. Carburetors with throttle plates (butterfly style) need to have the
carburetors main jet changed to a larger diameter jet to richen the mix or
a smaller diameter jet to lean your mix.
8. If your engine will not idle correctly or your air fuel mixture screws
seem to have no affect on the engine at idle, then most likely your pilot
jet circuit is clogged and you should clean it.
The snowmobile in the video is a 1986 Arctic cat cougar 500 fan cooled, it
has Mikuni vm34 roundslide carburetors which have a primer nipple on the
engine side of the throttle slide. Perfect place to attach a homemade
manometer to balance everything. These mikuni vm34 roundslide carburetors
were common on many motorcycles, snowmobiles and atv's. Suzuki, yamaha,
polaris, arctic cat, all used them at one time or another, they are good
carburetors when they are dialed in.
VW Generator Replacement PART-1
Replace a VW Generator with engine in the car.
THIS WILL BE ABOUT A 4-5 PART SERIES
South Jersey VW Club www.sjvwc.net
Videos by Jack Kessel
1993 GM 3.1 No Start Case Study (Part II)
This is part 2 of the car with the blown engine computer, where we find the
cause of all of these problems, as well as install a new engine computer.
For more help with no start diagnostics, I have material available on my
website at www.scannerdanner.com
This video was recorded during shop time at Rosedale Technical Institute in
Pittsburgh PA. For more information about our school go to
I would love to have you as part of my class in person!
Homemade 4 Cylinder Carburetor Synchronizer/Manometer
An extended video of my homemade manometer with detailed explanations and
demonstrations of it in operation. Very inexpensive yet very accurate. I
used Snapple bottles which worked fine, but if you can get taller bottles
that would be better as it gives you more time to fix a severely
out-of-sync cylinder before a bottle runs dry. You'll notice my design
links all 4 cylinders together to give you true comparison across all 4
Since it's been asked: if you get air in the reservoir line simply
blow/suck on one of the cylinder lines until all air bubbles are gone; just
like if a bottle goes dry, etc.
And for the carburetor adapters, you can make your own (see my comment in
the comments section) or buy them here:
Here's a list of required materials:
4 Glass bottles
4 Rubber Stoppers
4 plastic 'tees'
20'-25' clear tubing
4 intake port adapters (specific to your bike make/model)
Tip: put the stoppers in the freezer for a while before trying to drill the
holes for the tubing and it will drill much cleaner.
EMPI HPMX Initial Set-Up & Adjustment
EMPI HPMX Initial Set-Up & Adjustment video. This instructional video will
provide an introduction to the EMPI HPMX Carburetor and all of it's key
Dellorto / Weber carb secrets #2
A tabletop review of a dual throat 44 IDF weber carb. Discription of where
and what the different adjustment screws and jets do.
Carburetor Tuning, Featuring Gene Winfield's The Thing - Presented by Andy's Auto Sport
Adjusting a carburetor might sound scary, but with a few of the right tools
just about anyone can do it. Furthermore, today's carburetors are set up
very well from the factory, requiring only minor adjustments to get awesome
performance right out of the box! From stock replacement parts to
high-performance aftermarket accessories, Andy's Auto Sport has what you
need to get the looks and power your vehicle deserves.
Contact Us 1(800) 419 1152 or by email firstname.lastname@example.org
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